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author | Mario Six <mario.six@gdsys.cc> | 2018-08-09 15:51:23 +0300 |
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committer | Anatolij Gustschin <agust@denx.de> | 2018-08-11 10:18:44 +0300 |
commit | 25a9f9747a84b36f61f575d592eddc96bce5dabb (patch) | |
tree | b5a88de4eb7ad2b9578d9070a384829700250a8c /drivers/video/logicore_dp_tx.c | |
parent | 77d512ff18a6ca7fce7a05d756b0e00b5424f9c7 (diff) | |
download | u-boot-25a9f9747a84b36f61f575d592eddc96bce5dabb.tar.xz |
video_display: Add Xilinx LogiCore DP TX
Add a driver for the Xilinx LogiCORE DisplayPort IP core, which is a
pure DP transmitter core for Xiling FPGA (no display capabilities).
Signed-off-by: Mario Six <mario.six@gdsys.cc>
Diffstat (limited to 'drivers/video/logicore_dp_tx.c')
-rw-r--r-- | drivers/video/logicore_dp_tx.c | 2296 |
1 files changed, 2296 insertions, 0 deletions
diff --git a/drivers/video/logicore_dp_tx.c b/drivers/video/logicore_dp_tx.c new file mode 100644 index 0000000000..84fafe4341 --- /dev/null +++ b/drivers/video/logicore_dp_tx.c @@ -0,0 +1,2296 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * logicore_dp_tx.c + * + * Driver for XILINX LogiCore DisplayPort v6.1 TX (Source) + * based on Xilinx dp_v3_1 driver sources, updated to dp_v4_0 + * + * (C) Copyright 2016 + * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc + */ + +#include <common.h> +#include <clk.h> +#include <display.h> +#include <dm.h> +#include <errno.h> + +#include "axi.h" +#include "logicore_dp_dpcd.h" +#include "logicore_dp_tx.h" +#include "logicore_dp_tx_regif.h" + +/* Default AXI clock frequency value */ +#define S_AXI_CLK_DEFAULT 100000000 + +/* Default DP phy clock value */ +#define PHY_CLOCK_SELECT_DEFAULT PHY_CLOCK_SELECT_540GBPS + +/* The maximum voltage swing level is 3 */ +#define MAXIMUM_VS_LEVEL 3 +/* The maximum pre-emphasis level is 3 */ +#define MAXIMUM_PE_LEVEL 3 + +/* Error out if an AUX request yields a defer reply more than 50 times */ +#define AUX_MAX_DEFER_COUNT 50 +/* Error out if an AUX request times out more than 50 times awaiting a reply */ +#define AUX_MAX_TIMEOUT_COUNT 50 +/* Error out if checking for a connected device times out more than 50 times */ +#define IS_CONNECTED_MAX_TIMEOUT_COUNT 50 + +/** + * enum link_training_states - States for link training state machine + * @TS_CLOCK_RECOVERY: State for clock recovery + * @TS_CHANNEL_EQUALIZATION: State for channel equalization + * @TS_ADJUST_LINK_RATE: State where link rate is reduced in reaction to + * failed link training + * @TS_ADJUST_LANE_COUNT: State where lane count is reduced in reaction to + * failed link training + * @TS_FAILURE: State of link training failure + * @TS_SUCCESS:: State for successfully completed link training + */ +enum link_training_states { + TS_CLOCK_RECOVERY, + TS_CHANNEL_EQUALIZATION, + TS_ADJUST_LINK_RATE, + TS_ADJUST_LANE_COUNT, + TS_FAILURE, + TS_SUCCESS +}; + +/** + * struct aux_transaction - Description of an AUX channel transaction + * @cmd_code: Command code of the transaction + * @num_bytes: The number of bytes in the transaction's payload data + * @address: The DPCD address of the transaction + * @data: Payload data of the AUX channel transaction + */ +struct aux_transaction { + u16 cmd_code; + u8 num_bytes; + u32 address; + u8 *data; +}; + +/** + * struct main_stream_attributes - Main stream attributes + * @pixel_clock_hz: Pixel clock of the stream (in Hz) + * @misc_0: Miscellaneous stream attributes 0 as specified + * by the DisplayPort 1.2 specification + * @misc_1: Miscellaneous stream attributes 1 as specified + * by the DisplayPort 1.2 specification + * @n_vid: N value for the video stream + * @m_vid: M value used to recover the video clock from the + * link clock + * @user_pixel_width: Width of the user data input port + * @data_per_lane: Used to translate the number of pixels per line + * to the native internal 16-bit datapath + * @avg_bytes_per_tu: Average number of bytes per transfer unit, + * scaled up by a factor of 1000 + * @transfer_unit_size: Size of the transfer unit in the framing logic + * In MST mode, this is also the number of time + * slots that are alloted in the payload ID table + * @init_wait: Number of initial wait cycles at the start of a + * new line by the framing logic + * @bits_per_color: Bits per color component + * @component_format: The component format currently in use by the + * video stream + * @dynamic_range: The dynamic range currently in use by the video + * stream + * @y_cb_cr_colorimetry: The YCbCr colorimetry currently in use by the + * video stream + * @synchronous_clock_mode: Synchronous clock mode is currently in use by + * the video stream + * @override_user_pixel_width: If set to 1, the value stored for + * user_pixel_width will be used as the pixel width + * @h_start: Horizontal blank start (pixels) + * @h_active: Horizontal active resolution (pixels) + * @h_sync_width: Horizontal sync width (pixels) + * @h_total: Horizontal total (pixels) + * @h_sync_polarity: Horizontal sync polarity (0=neg|1=pos) + * @v_start: Vertical blank start (in lines) + * @v_active: Vertical active resolution (lines) + * @v_sync_width: Vertical sync width (lines) + * @v_total: Vertical total (lines) + * @v_sync_polarity: Vertical sync polarity (0=neg|1=pos) + * + * All porch parameters have been removed, because our videodata is + * hstart/vstart based, and there is no benefit in keeping the porches + */ +struct main_stream_attributes { + u32 pixel_clock_hz; + u32 misc_0; + u32 misc_1; + u32 n_vid; + //u32 m_vid; + u32 user_pixel_width; + u32 data_per_lane; + u32 avg_bytes_per_tu; + u32 transfer_unit_size; + u32 init_wait; + u32 bits_per_color; + u8 component_format; + u8 dynamic_range; + u8 y_cb_cr_colorimetry; + u8 synchronous_clock_mode; + u8 override_user_pixel_width; + u32 h_start; + u16 h_active; + u16 h_sync_width; + u16 h_total; + bool h_sync_polarity; + u32 v_start; + u16 v_active; + u16 v_sync_width; + u16 v_total; + bool v_sync_polarity; +}; + +/** + * struct link_config - Description of link configuration + * @lane_count: Currently selected lane count for this link + * @link_rate: Currently selected link rate for this link + * @scrambler_en: Flag to determine whether the scrambler is + * enabled for this link + * @enhanced_framing_mode: Flag to determine whether enhanced framing + * mode is active for this link + * @max_lane_count: Maximum lane count for this link + * @max_link_rate: Maximum link rate for this link + * @support_enhanced_framing_mode: Flag to indicate whether the link supports + * enhanced framing mode + * @vs_level: Voltage swing for each lane + * @pe_level: Pre-emphasis/cursor level for each lane + */ +struct link_config { + u8 lane_count; + u8 link_rate; + bool scrambler_en; + bool enhanced_framing_mode; + u8 max_lane_count; + u8 max_link_rate; + bool support_enhanced_framing_mode; + u8 vs_level; + u8 pe_level; +}; + +/** + * struct dp_tx - Private data structure of LogiCore DP TX devices + * + * @base: Address of register base of device + * @s_axi_clk: The AXI clock frequency in Hz + * @train_adaptive: Use adaptive link trainig (i.e. successively reduce + * link rate and/or lane count) for this device + * @max_link_rate: Maximum link rate for this device + * @max_lane_count: Maximum lane count for this device + * @dpcd_rx_caps: RX device's status registers, see below + * @lane_status_ajd_reqs: Lane status and adjustment requests information for + * this device + * @link_config: The link configuration for this device + * @main_stream_attributes: MSA set for this device + * + * dpcd_rx_caps is a raw read of the RX device's status registers. The first 4 + * bytes correspond to the lane status associated with clock recovery, channel + * equalization, symbol lock, and interlane alignment. The remaining 2 bytes + * represent the pre-emphasis and voltage swing level adjustments requested by + * the RX device. + */ +struct dp_tx { + u32 base; + u32 s_axi_clk; + bool train_adaptive; + u8 max_link_rate; + u8 max_lane_count; + u8 dpcd_rx_caps[16]; + u8 lane_status_ajd_reqs[6]; + struct link_config link_config; + struct main_stream_attributes main_stream_attributes; +}; + +/* + * Internal API + */ + +/** + * get_reg() - Read a register of a LogiCore DP TX device + * @dev: The LogiCore DP TX device in question + * @reg: The offset of the register to read + * + * Return: The read register value + */ +static u32 get_reg(struct udevice *dev, u32 reg) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u32 value = 0; + int res; + + /* TODO(mario.six@gdsys.cc): error handling */ + res = axi_read(dev->parent, dp_tx->base + reg, &value, AXI_SIZE_32); + if (res < 0) + printf("%s() failed; res = %d\n", __func__, res); + + return value; +} + +/** + * set_reg() - Write a register of a LogiCore DP TX device + * @dev: The LogiCore DP TX device in question + * @reg: The offset of the register to write + * @value: The value to write to the register + */ +static void set_reg(struct udevice *dev, u32 reg, u32 value) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + + axi_write(dev->parent, dp_tx->base + reg, &value, AXI_SIZE_32); +} + +/** + * is_connected() - Check if there is a connected RX device + * @dev: The LogiCore DP TX device in question + * + * The Xilinx original calls msleep_interruptible at least once, ignoring + * status. + * + * Return: true if a connected RX device was detected, false otherwise + */ +static bool is_connected(struct udevice *dev) +{ + u8 retries = 0; + + do { + int status = get_reg(dev, REG_INTERRUPT_SIG_STATE) & + INTERRUPT_SIG_STATE_HPD_STATE_MASK; + if (status) + return true; + + udelay(1000); + } while (retries++ < IS_CONNECTED_MAX_TIMEOUT_COUNT); + + return false; +} + +/** + * wait_phy_ready() - Wait for the DisplayPort PHY to come out of reset + * @dev: The LogiCore DP TX device in question + * @mask: Bit mask specifying which bit in the status register should be waited + * for + * + * Return: 0 if wait succeeded, -ve if error occurred + */ +static int wait_phy_ready(struct udevice *dev, u32 mask) +{ + u16 timeout = 20000; + u32 phy_status; + + /* Wait until the PHY is ready. */ + do { + phy_status = get_reg(dev, REG_PHY_STATUS) & mask; + + /* Protect against an infinite loop. */ + if (!timeout--) + return -ETIMEDOUT; + + udelay(20); + } while (phy_status != mask); + + return 0; +} + +/* AUX channel access */ + +/** + * aux_wait_ready() - Wait until another request is no longer in progress + * @dev: The LogiCore DP TX device in question + * + * Return: 0 if wait succeeded, -ve if error occurred + */ +static int aux_wait_ready(struct udevice *dev) +{ + int status; + u32 timeout = 100; + + /* Wait until the DisplayPort TX core is ready. */ + do { + status = get_reg(dev, REG_INTERRUPT_SIG_STATE); + + /* Protect against an infinite loop. */ + if (!timeout--) + return -ETIMEDOUT; + udelay(20); + } while (status & REPLY_STATUS_REPLY_IN_PROGRESS_MASK); + + return 0; +} + +/** + * aux_wait_reply() - Wait for reply on AUX channel + * @dev: The LogiCore DP TX device in question + * + * Wait for a reply indicating that the most recent AUX request + * has been received by the RX device. + * + * Return: 0 if wait succeeded, -ve if error occurred + */ +static int aux_wait_reply(struct udevice *dev) +{ + u32 timeout = 100; + + while (timeout > 0) { + int status = get_reg(dev, REG_REPLY_STATUS); + + /* Check for error. */ + if (status & REPLY_STATUS_REPLY_ERROR_MASK) + return -ETIMEDOUT; + + /* Check for a reply. */ + if ((status & REPLY_STATUS_REPLY_RECEIVED_MASK) && + !(status & + REPLY_STATUS_REQUEST_IN_PROGRESS_MASK) && + !(status & + REPLY_STATUS_REPLY_IN_PROGRESS_MASK)) { + return 0; + } + + timeout--; + udelay(20); + } + + return -ETIMEDOUT; +} + +/** + * aux_request_send() - Send request on the AUX channel + * @dev: The LogiCore DP TX device in question + * @request: The request to send + * + * Submit the supplied AUX request to the RX device over the AUX + * channel by writing the command, the destination address, (the write buffer + * for write commands), and the data size to the DisplayPort TX core. + * + * This is the lower-level sending routine, which is called by aux_request(). + * + * Return: 0 if request was sent successfully, -ve on error + */ +static int aux_request_send(struct udevice *dev, + struct aux_transaction *request) +{ + u32 timeout_count; + int status; + u8 index; + + /* Ensure that any pending AUX transactions have completed. */ + timeout_count = 0; + do { + status = get_reg(dev, REG_REPLY_STATUS); + + udelay(20); + timeout_count++; + if (timeout_count >= AUX_MAX_TIMEOUT_COUNT) + return -ETIMEDOUT; + } while ((status & REPLY_STATUS_REQUEST_IN_PROGRESS_MASK) || + (status & REPLY_STATUS_REPLY_IN_PROGRESS_MASK)); + + set_reg(dev, REG_AUX_ADDRESS, request->address); + + if (request->cmd_code == AUX_CMD_WRITE || + request->cmd_code == AUX_CMD_I2C_WRITE || + request->cmd_code == AUX_CMD_I2C_WRITE_MOT) { + /* Feed write data into the DisplayPort TX core's write FIFO. */ + for (index = 0; index < request->num_bytes; index++) { + set_reg(dev, + REG_AUX_WRITE_FIFO, request->data[index]); + } + } + + /* Submit the command and the data size. */ + set_reg(dev, REG_AUX_CMD, + ((request->cmd_code << AUX_CMD_SHIFT) | + ((request->num_bytes - 1) & + AUX_CMD_NBYTES_TRANSFER_MASK))); + + /* Check for a reply from the RX device to the submitted request. */ + status = aux_wait_reply(dev); + if (status) + /* Waiting for a reply timed out. */ + return -ETIMEDOUT; + + /* Analyze the reply. */ + status = get_reg(dev, REG_AUX_REPLY_CODE); + if (status == AUX_REPLY_CODE_DEFER || + status == AUX_REPLY_CODE_I2C_DEFER) { + /* The request was deferred. */ + return -EAGAIN; + } else if ((status == AUX_REPLY_CODE_NACK) || + (status == AUX_REPLY_CODE_I2C_NACK)) { + /* The request was not acknowledged. */ + return -EIO; + } + + /* The request was acknowledged. */ + + if (request->cmd_code == AUX_CMD_READ || + request->cmd_code == AUX_CMD_I2C_READ || + request->cmd_code == AUX_CMD_I2C_READ_MOT) { + /* Wait until all data has been received. */ + timeout_count = 0; + do { + status = get_reg(dev, REG_REPLY_DATA_COUNT); + + udelay(100); + timeout_count++; + if (timeout_count >= AUX_MAX_TIMEOUT_COUNT) + return -ETIMEDOUT; + } while (status != request->num_bytes); + + /* Obtain the read data from the reply FIFO. */ + for (index = 0; index < request->num_bytes; index++) + request->data[index] = get_reg(dev, REG_AUX_REPLY_DATA); + } + + return 0; +} + +/** + * aux_request() - Submit request on the AUX channel + * @dev: The LogiCore DP TX device in question + * @request: The request to submit + * + * Submit the supplied AUX request to the RX device over the AUX + * channel. If waiting for a reply times out, or if the DisplayPort TX core + * indicates that the request was deferred, the request is sent again (up to a + * maximum specified by AUX_MAX_DEFER_COUNT|AUX_MAX_TIMEOUT_COUNT). + * + * Return: 0 if request was submitted successfully, -ve on error + */ +static int aux_request(struct udevice *dev, struct aux_transaction *request) +{ + u32 defer_count = 0; + u32 timeout_count = 0; + + while ((defer_count < AUX_MAX_DEFER_COUNT) && + (timeout_count < AUX_MAX_TIMEOUT_COUNT)) { + int status = aux_wait_ready(dev); + + if (status) { + /* The RX device isn't ready yet. */ + timeout_count++; + continue; + } + + status = aux_request_send(dev, request); + if (status == -EAGAIN) { + /* The request was deferred. */ + defer_count++; + } else if (status == -ETIMEDOUT) { + /* Waiting for a reply timed out. */ + timeout_count++; + } else { + /* + * -EIO indicates that the request was NACK'ed, + * 0 indicates that the request was ACK'ed. + */ + return status; + } + + udelay(100); + } + + /* The request was not successfully received by the RX device. */ + return -ETIMEDOUT; +} + +/** + * aux_common() - Common (read/write) AUX communication transmission + * @dev: The LogiCore DP TX device in question + * @cmd_type: Command code of the transaction + * @address: The DPCD address of the transaction + * @num_bytes: Number of bytes in the payload data + * @data: The payload data of the AUX command + * + * Common sequence of submitting an AUX command for AUX read, AUX write, + * I2C-over-AUX read, and I2C-over-AUX write transactions. If required, the + * reads and writes are split into multiple requests, each acting on a maximum + * of 16 bytes. + * + * Return: 0 if OK, -ve on error + */ +static int aux_common(struct udevice *dev, u32 cmd_type, u32 address, + u32 num_bytes, u8 *data) +{ + struct aux_transaction request; + u32 bytes_left; + + /* + * Set the start address for AUX transactions. For I2C transactions, + * this is the address of the I2C bus. + */ + request.address = address; + + bytes_left = num_bytes; + while (bytes_left) { + int status; + + request.cmd_code = cmd_type; + + if (cmd_type == AUX_CMD_READ || + cmd_type == AUX_CMD_WRITE) { + /* Increment address for normal AUX transactions. */ + request.address = address + (num_bytes - bytes_left); + } + + /* Increment the pointer to the supplied data buffer. */ + request.data = &data[num_bytes - bytes_left]; + + request.num_bytes = (bytes_left > 16) ? 16 : bytes_left; + bytes_left -= request.num_bytes; + + if (cmd_type == AUX_CMD_I2C_READ && bytes_left) { + /* + * Middle of a transaction I2C read request. Override + * the command code that was set to cmd_type. + */ + request.cmd_code = AUX_CMD_I2C_READ_MOT; + } else if ((cmd_type == AUX_CMD_I2C_WRITE) && bytes_left) { + /* + * Middle of a transaction I2C write request. Override + * the command code that was set to cmd_type. + */ + request.cmd_code = AUX_CMD_I2C_WRITE_MOT; + } + + status = aux_request(dev, &request); + if (status) + return status; + } + + return 0; +} + +/** + * aux_read() - Issue AUX read request + * @dev: The LogiCore DP TX device in question + * @dpcd_address: The DPCD address to read from + * @bytes_to_read: Number of bytes to read + * @read_data: Buffer to receive the read data + * + * Issue a read request over the AUX channel that will read from the RX + * device's DisplayPort Configuration data (DPCD) address space. The read + * message will be divided into multiple transactions which read a maximum of + * 16 bytes each. + * + * Return: 0 if read operation was successful, -ve on error + */ +static int aux_read(struct udevice *dev, u32 dpcd_address, u32 bytes_to_read, + void *read_data) +{ + int status; + + if (!is_connected(dev)) + return -ENODEV; + + /* Send AUX read transaction. */ + status = aux_common(dev, AUX_CMD_READ, dpcd_address, + bytes_to_read, (u8 *)read_data); + + return status; +} + +/** + * aux_write() - Issue AUX write request + * @dev: The LogiCore DP TX device in question + * @dpcd_address: The DPCD address to write to + * @bytes_to_write: Number of bytes to write + * @write_data: Buffer containig data to be written + * + * Issue a write request over the AUX channel that will write to + * the RX device's DisplayPort Configuration data (DPCD) address space. The + * write message will be divided into multiple transactions which write a + * maximum of 16 bytes each. + * + * Return: 0 if write operation was successful, -ve on error + */ +static int aux_write(struct udevice *dev, u32 dpcd_address, u32 bytes_to_write, + void *write_data) +{ + int status; + + if (!is_connected(dev)) + return -ENODEV; + + /* Send AUX write transaction. */ + status = aux_common(dev, AUX_CMD_WRITE, dpcd_address, + bytes_to_write, (u8 *)write_data); + + return status; +} + +/* Core initialization */ + +/** + * initialize() - Initialize a LogiCore DP TX device + * @dev: The LogiCore DP TX device in question + * + * Return: Always 0 + */ +static int initialize(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u32 val; + u32 phy_config; + unsigned int k; + + /* place the PHY (and GTTXRESET) into reset. */ + phy_config = get_reg(dev, REG_PHY_CONFIG); + set_reg(dev, REG_PHY_CONFIG, phy_config | PHY_CONFIG_GT_ALL_RESET_MASK); + + /* reset the video streams and AUX logic. */ + set_reg(dev, REG_SOFT_RESET, + SOFT_RESET_VIDEO_STREAM_ALL_MASK | + SOFT_RESET_AUX_MASK); + + /* disable the DisplayPort TX core. */ + set_reg(dev, REG_ENABLE, 0); + + /* set the clock divider. */ + val = get_reg(dev, REG_AUX_CLK_DIVIDER); + val &= ~AUX_CLK_DIVIDER_VAL_MASK; + val |= dp_tx->s_axi_clk / 1000000; + set_reg(dev, REG_AUX_CLK_DIVIDER, val); + + /* set the DisplayPort TX core's clock speed. */ + set_reg(dev, REG_PHY_CLOCK_SELECT, PHY_CLOCK_SELECT_DEFAULT); + + /* bring the PHY (and GTTXRESET) out of reset. */ + set_reg(dev, REG_PHY_CONFIG, + phy_config & ~PHY_CONFIG_GT_ALL_RESET_MASK); + + /* enable the DisplayPort TX core. */ + set_reg(dev, REG_ENABLE, 1); + + /* Unmask Hot-Plug-Detect (HPD) interrupts. */ + set_reg(dev, REG_INTERRUPT_MASK, + ~INTERRUPT_MASK_HPD_PULSE_DETECTED_MASK & + ~INTERRUPT_MASK_HPD_EVENT_MASK & + ~INTERRUPT_MASK_HPD_IRQ_MASK); + + for (k = 0; k < 4; k++) { + /* Disable pre-cursor levels. */ + set_reg(dev, REG_PHY_PRECURSOR_LANE_0 + 4 * k, 0); + + /* Write default voltage swing levels to the TX registers. */ + set_reg(dev, REG_PHY_VOLTAGE_DIFF_LANE_0 + 4 * k, 0); + + /* Write default pre-emphasis levels to the TX registers. */ + set_reg(dev, REG_PHY_POSTCURSOR_LANE_0 + 4 * k, 0); + } + + return 0; +} + +/** + * is_link_rate_valid() - Check if given link rate is valif for device + * @dev: The LogiCore DP TX device in question + * @link_rate: The link rate to be checked for validity + * + * Return: true if he supplied link rate is valid, false otherwise + */ +static bool is_link_rate_valid(struct udevice *dev, u8 link_rate) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + bool valid = true; + + if (link_rate != LINK_BW_SET_162GBPS && + link_rate != LINK_BW_SET_270GBPS && + link_rate != LINK_BW_SET_540GBPS) + valid = false; + else if (link_rate > dp_tx->link_config.max_link_rate) + valid = false; + + return valid; +} + +/** + * is_lane_count_valid() - Check if given lane count is valif for device + * @dev: The LogiCore DP TX device in question + * @lane_count: The lane count to be checked for validity + * + * Return: true if he supplied lane count is valid, false otherwise + */ +static bool is_lane_count_valid(struct udevice *dev, u8 lane_count) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + bool valid = true; + + if (lane_count != LANE_COUNT_SET_1 && + lane_count != LANE_COUNT_SET_2 && + lane_count != LANE_COUNT_SET_4) + valid = false; + else if (lane_count > dp_tx->link_config.max_lane_count) + valid = false; + + return valid; +} + +/** + * get_rx_capabilities() - Check if capabilities of RX device are valid for TX + * device + * @dev: The LogiCore DP TX device in question + * + * Return: 0 if the capabilities of the RX device are valid for the TX device, + * -ve if not, of an error occurred during capability determination + */ +static int get_rx_capabilities(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u8 rx_max_link_rate; + u8 rx_max_lane_count; + + if (!is_connected(dev)) + return -ENODEV; + + status = aux_read(dev, DPCD_RECEIVER_CAP_FIELD_START, 16, + dp_tx->dpcd_rx_caps); + if (status) + return -EIO; + + rx_max_link_rate = dp_tx->dpcd_rx_caps[DPCD_MAX_LINK_RATE]; + rx_max_lane_count = dp_tx->dpcd_rx_caps[DPCD_MAX_LANE_COUNT] & + DPCD_MAX_LANE_COUNT_MASK; + + dp_tx->link_config.max_link_rate = + (rx_max_link_rate > dp_tx->max_link_rate) ? + dp_tx->max_link_rate : rx_max_link_rate; + if (!is_link_rate_valid(dev, rx_max_link_rate)) + return -EINVAL; + + dp_tx->link_config.max_lane_count = + (rx_max_lane_count > dp_tx->max_lane_count) ? + dp_tx->max_lane_count : rx_max_lane_count; + if (!is_lane_count_valid(dev, rx_max_lane_count)) + return -EINVAL; + + dp_tx->link_config.support_enhanced_framing_mode = + dp_tx->dpcd_rx_caps[DPCD_MAX_LANE_COUNT] & + DPCD_ENHANCED_FRAME_SUPPORT_MASK; + + return 0; +} + +/** + * enable_main_link() - Switch on main link for a device + * @dev: The LogiCore DP TX device in question + */ +static void enable_main_link(struct udevice *dev) +{ + /* reset the scrambler. */ + set_reg(dev, REG_FORCE_SCRAMBLER_RESET, 0x1); + + /* enable the main stream. */ + set_reg(dev, REG_ENABLE_MAIN_STREAM, 0x1); +} + +/** + * disable_main_link() - Switch off main link for a device + * @dev: The LogiCore DP TX device in question + */ +static void disable_main_link(struct udevice *dev) +{ + /* reset the scrambler. */ + set_reg(dev, REG_FORCE_SCRAMBLER_RESET, 0x1); + + /* Disable the main stream. */ + set_reg(dev, REG_ENABLE_MAIN_STREAM, 0x0); +} + +/** + * reset_dp_phy() - Reset a device + * @dev: The LogiCore DP TX device in question + * @reset: Bit mask determining which bits in the device's config register + * should be set for the reset + */ +static void reset_dp_phy(struct udevice *dev, u32 reset) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u32 val; + + set_reg(dev, REG_ENABLE, 0x0); + + val = get_reg(dev, REG_PHY_CONFIG); + + /* Apply reset. */ + set_reg(dev, REG_PHY_CONFIG, val | reset); + + /* Remove reset. */ + set_reg(dev, REG_PHY_CONFIG, val); + + /* Wait for the PHY to be ready. */ + wait_phy_ready(dev, phy_status_lanes_ready_mask(dp_tx->max_lane_count)); + + set_reg(dev, REG_ENABLE, 0x1); +} + +/** + * set_enhanced_frame_mode() - Enable/Disable enhanced frame mode + * @dev: The LogiCore DP TX device in question + * @enable: Flag to determine whether to enable (1) or disable (0) the enhanced + * frame mode + * + * Enable or disable the enhanced framing symbol sequence for + * both the DisplayPort TX core and the RX device. + * + * Return: 0 if enabling/disabling the enhanced frame mode was successful, -ve + * on error + */ +static int set_enhanced_frame_mode(struct udevice *dev, u8 enable) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u8 val; + + if (!is_connected(dev)) + return -ENODEV; + + if (dp_tx->link_config.support_enhanced_framing_mode) + dp_tx->link_config.enhanced_framing_mode = enable; + else + dp_tx->link_config.enhanced_framing_mode = false; + + /* Write enhanced frame mode enable to the DisplayPort TX core. */ + set_reg(dev, REG_ENHANCED_FRAME_EN, + dp_tx->link_config.enhanced_framing_mode); + + /* Write enhanced frame mode enable to the RX device. */ + status = aux_read(dev, DPCD_LANE_COUNT_SET, 0x1, &val); + if (status) + return -EIO; + + if (dp_tx->link_config.enhanced_framing_mode) + val |= DPCD_ENHANCED_FRAME_EN_MASK; + else + val &= ~DPCD_ENHANCED_FRAME_EN_MASK; + + status = aux_write(dev, DPCD_LANE_COUNT_SET, 0x1, &val); + if (status) + return -EIO; + + return 0; +} + +/** + * set_lane_count() - Set the lane count + * @dev: The LogiCore DP TX device in question + * @lane_count: Lane count to set + * + * Set the number of lanes to be used by the main link for both + * the DisplayPort TX core and the RX device. + * + * Return: 0 if setting the lane count was successful, -ve on error + */ +static int set_lane_count(struct udevice *dev, u8 lane_count) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u8 val; + + if (!is_connected(dev)) + return -ENODEV; + + printf(" set lane count to %u\n", lane_count); + + dp_tx->link_config.lane_count = lane_count; + + /* Write the new lane count to the DisplayPort TX core. */ + set_reg(dev, REG_LANE_COUNT_SET, dp_tx->link_config.lane_count); + + /* Write the new lane count to the RX device. */ + status = aux_read(dev, DPCD_LANE_COUNT_SET, 0x1, &val); + if (status) + return -EIO; + val &= ~DPCD_LANE_COUNT_SET_MASK; + val |= dp_tx->link_config.lane_count; + + status = aux_write(dev, DPCD_LANE_COUNT_SET, 0x1, &val); + if (status) + return -EIO; + + return 0; +} + +/** + * set_clk_speed() - Set DP phy clock speed + * @dev: The LogiCore DP TX device in question + * @speed: The clock frquency to set (one of PHY_CLOCK_SELECT_*) + * + * Set the clock frequency for the DisplayPort PHY corresponding to a desired + * data rate. + * + * Return: 0 if setting the DP phy clock speed was successful, -ve on error + */ +static int set_clk_speed(struct udevice *dev, u32 speed) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u32 val; + u32 mask; + + /* Disable the DisplayPort TX core first. */ + val = get_reg(dev, REG_ENABLE); + set_reg(dev, REG_ENABLE, 0x0); + + /* Change speed of the feedback clock. */ + set_reg(dev, REG_PHY_CLOCK_SELECT, speed); + + /* Re-enable the DisplayPort TX core if it was previously enabled. */ + if (val) + set_reg(dev, REG_ENABLE, 0x1); + + /* Wait until the PHY is ready. */ + mask = phy_status_lanes_ready_mask(dp_tx->max_lane_count); + status = wait_phy_ready(dev, mask); + if (status) + return -EIO; + + return 0; +} + +/** + * set_link_rate() - Set the link rate + * @dev: The LogiCore DP TX device in question + * @link_rate: The link rate to set (one of LINK_BW_SET_*) + * + * Set the data rate to be used by the main link for both the DisplayPort TX + * core and the RX device. + * + * Return: 0 if setting the link rate was successful, -ve on error + */ +static int set_link_rate(struct udevice *dev, u8 link_rate) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + + /* Write a corresponding clock frequency to the DisplayPort TX core. */ + switch (link_rate) { + case LINK_BW_SET_162GBPS: + printf(" set link rate to 1.62 Gb/s\n"); + status = set_clk_speed(dev, PHY_CLOCK_SELECT_162GBPS); + break; + case LINK_BW_SET_270GBPS: + printf(" set link rate to 2.70 Gb/s\n"); + status = set_clk_speed(dev, PHY_CLOCK_SELECT_270GBPS); + break; + case LINK_BW_SET_540GBPS: + printf(" set link rate to 5.40 Gb/s\n"); + status = set_clk_speed(dev, PHY_CLOCK_SELECT_540GBPS); + break; + default: + return -EINVAL; + } + if (status) + return -EIO; + + dp_tx->link_config.link_rate = link_rate; + + /* Write new link rate to the DisplayPort TX core. */ + set_reg(dev, REG_LINK_BW_SET, dp_tx->link_config.link_rate); + + /* Write new link rate to the RX device. */ + status = aux_write(dev, DPCD_LINK_BW_SET, 1, + &dp_tx->link_config.link_rate); + if (status) + return -EIO; + + return 0; +} + +/* Link training */ + +/** + * get_training_delay() - Get training delay + * @dev: The LogiCore DP TX device in question + * @training_state: The training state for which the required training delay + * should be queried + * + * Determine what the RX device's required training delay is for + * link training. + * + * Return: The training delay in us + */ +static int get_training_delay(struct udevice *dev, int training_state) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u16 delay; + + switch (dp_tx->dpcd_rx_caps[DPCD_TRAIN_AUX_RD_INTERVAL]) { + case DPCD_TRAIN_AUX_RD_INT_100_400US: + if (training_state == TS_CLOCK_RECOVERY) + /* delay for the clock recovery phase. */ + delay = 100; + else + /* delay for the channel equalization phase. */ + delay = 400; + break; + case DPCD_TRAIN_AUX_RD_INT_4MS: + delay = 4000; + break; + case DPCD_TRAIN_AUX_RD_INT_8MS: + delay = 8000; + break; + case DPCD_TRAIN_AUX_RD_INT_12MS: + delay = 12000; + break; + case DPCD_TRAIN_AUX_RD_INT_16MS: + delay = 16000; + break; + default: + /* Default to 20 ms. */ + delay = 20000; + break; + } + + return delay; +} + +/** + * set_vswing_preemp() - Build AUX data to set voltage swing and pre-emphasis + * @dev: The LogiCore DP TX device in question + * @aux_data: Buffer to receive the built AUX data + * + * Build AUX data to set current voltage swing and pre-emphasis level settings; + * the necessary data is taken from the link_config structure. + */ +static void set_vswing_preemp(struct udevice *dev, u8 *aux_data) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u8 data; + u8 vs_level_rx = dp_tx->link_config.vs_level; + u8 pe_level_rx = dp_tx->link_config.pe_level; + + /* Set up the data buffer for writing to the RX device. */ + data = (pe_level_rx << DPCD_TRAINING_LANEX_SET_PE_SHIFT) | vs_level_rx; + /* The maximum voltage swing has been reached. */ + if (vs_level_rx == MAXIMUM_VS_LEVEL) + data |= DPCD_TRAINING_LANEX_SET_MAX_VS_MASK; + + /* The maximum pre-emphasis level has been reached. */ + if (pe_level_rx == MAXIMUM_PE_LEVEL) + data |= DPCD_TRAINING_LANEX_SET_MAX_PE_MASK; + memset(aux_data, data, 4); +} + +/** + * adj_vswing_preemp() - Adjust voltage swing and pre-emphasis + * @dev: The LogiCore DP TX device in question + * + * Set new voltage swing and pre-emphasis levels using the + * adjustment requests obtained from the RX device. + * + * Return: 0 if voltage swing and pre-emphasis could be adjusted successfully, + * -ve on error + */ +static int adj_vswing_preemp(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u8 index; + u8 vs_level_adj_req[4]; + u8 pe_level_adj_req[4]; + u8 aux_data[4]; + u8 *ajd_reqs = &dp_tx->lane_status_ajd_reqs[4]; + + /* + * Analyze the adjustment requests for changes in voltage swing and + * pre-emphasis levels. + */ + vs_level_adj_req[0] = ajd_reqs[0] & DPCD_ADJ_REQ_LANE_0_2_VS_MASK; + vs_level_adj_req[1] = (ajd_reqs[0] & DPCD_ADJ_REQ_LANE_1_3_VS_MASK) >> + DPCD_ADJ_REQ_LANE_1_3_VS_SHIFT; + vs_level_adj_req[2] = ajd_reqs[1] & DPCD_ADJ_REQ_LANE_0_2_VS_MASK; + vs_level_adj_req[3] = (ajd_reqs[1] & DPCD_ADJ_REQ_LANE_1_3_VS_MASK) >> + DPCD_ADJ_REQ_LANE_1_3_VS_SHIFT; + pe_level_adj_req[0] = (ajd_reqs[0] & DPCD_ADJ_REQ_LANE_0_2_PE_MASK) >> + DPCD_ADJ_REQ_LANE_0_2_PE_SHIFT; + pe_level_adj_req[1] = (ajd_reqs[0] & DPCD_ADJ_REQ_LANE_1_3_PE_MASK) >> + DPCD_ADJ_REQ_LANE_1_3_PE_SHIFT; + pe_level_adj_req[2] = (ajd_reqs[1] & DPCD_ADJ_REQ_LANE_0_2_PE_MASK) >> + DPCD_ADJ_REQ_LANE_0_2_PE_SHIFT; + pe_level_adj_req[3] = (ajd_reqs[1] & DPCD_ADJ_REQ_LANE_1_3_PE_MASK) >> + DPCD_ADJ_REQ_LANE_1_3_PE_SHIFT; + + /* + * Change the drive settings to match the adjustment requests. Use the + * greatest level requested. + */ + dp_tx->link_config.vs_level = 0; + dp_tx->link_config.pe_level = 0; + for (index = 0; index < dp_tx->link_config.lane_count; index++) { + if (vs_level_adj_req[index] > dp_tx->link_config.vs_level) + dp_tx->link_config.vs_level = vs_level_adj_req[index]; + if (pe_level_adj_req[index] > dp_tx->link_config.pe_level) + dp_tx->link_config.pe_level = pe_level_adj_req[index]; + } + + /* + * Verify that the voltage swing and pre-emphasis combination is + * allowed. Some combinations will result in a differential peak-to-peak + * voltage that is outside the permissible range. See the VESA + * DisplayPort v1.2 Specification, section 3.1.5.2. + * The valid combinations are: + * PE=0 PE=1 PE=2 PE=3 + * VS=0 valid valid valid valid + * VS=1 valid valid valid + * VS=2 valid valid + * VS=3 valid + * + * NOTE: + * Xilinix dp_v3_1 driver seems to have an off by one error when + * limiting pe_level which is fixed here. + */ + if (dp_tx->link_config.pe_level > (3 - dp_tx->link_config.vs_level)) + dp_tx->link_config.pe_level = 3 - dp_tx->link_config.vs_level; + + /* + * Make the adjustments to both the DisplayPort TX core and the RX + * device. + */ + set_vswing_preemp(dev, aux_data); + /* + * Write the voltage swing and pre-emphasis levels for each lane to the + * RX device. + */ + status = aux_write(dev, DPCD_TRAINING_LANE0_SET, 4, aux_data); + if (status) + return -EIO; + + return 0; +} + +/** + * get_lane_status_adj_reqs() - Read lane status and adjustment requests + * information from the device + * @dev: The LogiCore DP TX device in question + * + * Do a burst AUX read from the RX device over the AUX channel. The contents of + * the status registers will be stored for later use by check_clock_recovery, + * check_channel_equalization, and adj_vswing_preemp. + * + * Return: 0 if the status information were read successfully, -ve on error + */ +static int get_lane_status_adj_reqs(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + + /* + * Read and store 4 bytes of lane status and 2 bytes of adjustment + * requests. + */ + status = aux_read(dev, DPCD_STATUS_LANE_0_1, 6, + dp_tx->lane_status_ajd_reqs); + if (status) + return -EIO; + + return 0; +} + +/** + * check_clock_recovery() - Check clock recovery success + * @dev: The LogiCore DP TX device in question + * @lane_count: The number of lanes for which to check clock recovery success + * + * Check if the RX device's DisplayPort Configuration data (DPCD) indicates + * that the clock recovery sequence during link training was successful - the + * RX device's link clock and data recovery unit has realized and maintained + * the frequency lock for all lanes currently in use. + * + * Return: 0 if clock recovery was successful on all lanes in question, -ve if + * not + */ +static int check_clock_recovery(struct udevice *dev, u8 lane_count) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u8 *lane_status = dp_tx->lane_status_ajd_reqs; + + /* Check that all LANEx_CR_DONE bits are set. */ + switch (lane_count) { + case LANE_COUNT_SET_4: + if (!(lane_status[1] & DPCD_STATUS_LANE_3_CR_DONE_MASK)) + goto out_fail; + if (!(lane_status[1] & DPCD_STATUS_LANE_2_CR_DONE_MASK)) + goto out_fail; + /* Drop through and check lane 1. */ + case LANE_COUNT_SET_2: + if (!(lane_status[0] & DPCD_STATUS_LANE_1_CR_DONE_MASK)) + goto out_fail; + /* Drop through and check lane 0. */ + case LANE_COUNT_SET_1: + if (!(lane_status[0] & DPCD_STATUS_LANE_0_CR_DONE_MASK)) + goto out_fail; + default: + /* All (lane_count) lanes have achieved clock recovery. */ + break; + } + + return 0; + +out_fail: + return -EIO; +} + +/** + * check_channel_equalization() - Check channel equalization success + * @dev: The LogiCore DP TX device in question + * @lane_count: The number of lanes for which to check channel equalization + * success + * + * Check if the RX device's DisplayPort Configuration data (DPCD) indicates + * that the channel equalization sequence during link training was successful - + * the RX device has achieved channel equalization, symbol lock, and interlane + * alignment for all lanes currently in use. + * + * Return: 0 if channel equalization was successful on all lanes in question, + * -ve if not + */ +static int check_channel_equalization(struct udevice *dev, u8 lane_count) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u8 *lane_status = dp_tx->lane_status_ajd_reqs; + + /* Check that all LANEx_CHANNEL_EQ_DONE bits are set. */ + switch (lane_count) { + case LANE_COUNT_SET_4: + if (!(lane_status[1] & DPCD_STATUS_LANE_3_CE_DONE_MASK)) + goto out_fail; + if (!(lane_status[1] & DPCD_STATUS_LANE_2_CE_DONE_MASK)) + goto out_fail; + /* Drop through and check lane 1. */ + case LANE_COUNT_SET_2: + if (!(lane_status[0] & DPCD_STATUS_LANE_1_CE_DONE_MASK)) + goto out_fail; + /* Drop through and check lane 0. */ + case LANE_COUNT_SET_1: + if (!(lane_status[0] & DPCD_STATUS_LANE_0_CE_DONE_MASK)) + goto out_fail; + default: + /* All (lane_count) lanes have achieved channel equalization. */ + break; + } + + /* Check that all LANEx_SYMBOL_LOCKED bits are set. */ + switch (lane_count) { + case LANE_COUNT_SET_4: + if (!(lane_status[1] & DPCD_STATUS_LANE_3_SL_DONE_MASK)) + goto out_fail; + if (!(lane_status[1] & DPCD_STATUS_LANE_2_SL_DONE_MASK)) + goto out_fail; + /* Drop through and check lane 1. */ + case LANE_COUNT_SET_2: + if (!(lane_status[0] & DPCD_STATUS_LANE_1_SL_DONE_MASK)) + goto out_fail; + /* Drop through and check lane 0. */ + case LANE_COUNT_SET_1: + if (!(lane_status[0] & DPCD_STATUS_LANE_0_SL_DONE_MASK)) + goto out_fail; + default: + /* All (lane_count) lanes have achieved symbol lock. */ + break; + } + + /* Check that interlane alignment is done. */ + if (!(lane_status[2] & DPCD_LANE_ALIGN_STATUS_UPDATED_IA_DONE_MASK)) + goto out_fail; + + return 0; + +out_fail: + return -EIO; +} + +/** + * set_training_pattern() - Set training pattern for link training + * @dev: The LogiCore DP TX device in question + * @pattern: The training pattern to set + * + * Set the training pattern to be used during link training for both the + * DisplayPort TX core and the RX device. + * + * Return: 0 if the training pattern could be set successfully, -ve if not + */ +static int set_training_pattern(struct udevice *dev, u32 pattern) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u8 aux_data[5]; + + /* Write to the DisplayPort TX core. */ + set_reg(dev, REG_TRAINING_PATTERN_SET, pattern); + + aux_data[0] = pattern; + + /* Write scrambler disable to the DisplayPort TX core. */ + switch (pattern) { + case TRAINING_PATTERN_SET_OFF: + set_reg(dev, REG_SCRAMBLING_DISABLE, 0); + dp_tx->link_config.scrambler_en = 1; + break; + case TRAINING_PATTERN_SET_TP1: + case TRAINING_PATTERN_SET_TP2: + case TRAINING_PATTERN_SET_TP3: + aux_data[0] |= DPCD_TP_SET_SCRAMB_DIS_MASK; + set_reg(dev, REG_SCRAMBLING_DISABLE, 1); + dp_tx->link_config.scrambler_en = 0; + break; + default: + break; + } + + /* + * Make the adjustments to both the DisplayPort TX core and the RX + * device. + */ + set_vswing_preemp(dev, &aux_data[1]); + /* + * Write the voltage swing and pre-emphasis levels for each lane to the + * RX device. + */ + if (pattern == TRAINING_PATTERN_SET_OFF) + status = aux_write(dev, DPCD_TP_SET, 1, aux_data); + else + status = aux_write(dev, DPCD_TP_SET, 5, aux_data); + if (status) + return -EIO; + + return 0; +} + +/** + * training_state_clock_recovery() - Run clock recovery part of link training + * @dev: The LogiCore DP TX device in question + * + * Run the clock recovery sequence as part of link training. The + * sequence is as follows: + * + * 0) Start signaling at the minimum voltage swing, pre-emphasis, and + * post- cursor levels. + * 1) Transmit training pattern 1 over the main link with symbol + * scrambling disabled. + * 2) The clock recovery loop. If clock recovery is unsuccessful after + * MaxIterations loop iterations, return. + * 2a) Wait for at least the period of time specified in the RX device's + * DisplayPort Configuration data (DPCD) register, + * TRAINING_AUX_RD_INTERVAL. + * 2b) Check if all lanes have achieved clock recovery lock. If so, + * return. + * 2c) Check if the same voltage swing level has been used 5 consecutive + * times or if the maximum level has been reached. If so, return. + * 2d) Adjust the voltage swing, pre-emphasis, and post-cursor levels as + * requested by the RX device. + * 2e) Loop back to 2a. + * + * For a more detailed description of the clock recovery sequence, see section + * 3.5.1.2.1 of the DisplayPort 1.2a specification document. + * + * Return: The next state machine state to advance to + */ +static unsigned int training_state_clock_recovery(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u32 delay_us; + u8 prev_vs_level = 0; + u8 same_vs_level_count = 0; + + /* + * Obtain the required delay for clock recovery as specified by the + * RX device. + */ + delay_us = get_training_delay(dev, TS_CLOCK_RECOVERY); + + /* Start CRLock. */ + + /* Transmit training pattern 1. */ + /* Disable the scrambler. */ + /* Start from minimal voltage swing and pre-emphasis levels. */ + dp_tx->link_config.vs_level = 0; + dp_tx->link_config.pe_level = 0; + status = set_training_pattern(dev, TRAINING_PATTERN_SET_TP1); + if (status) + return TS_FAILURE; + + while (1) { + /* Wait delay specified in TRAINING_AUX_RD_INTERVAL. */ + udelay(delay_us); + + /* Get lane and adjustment requests. */ + status = get_lane_status_adj_reqs(dev); + if (status) + return TS_FAILURE; + + /* + * Check if all lanes have realized and maintained the frequency + * lock and get adjustment requests. + */ + status = check_clock_recovery(dev, + dp_tx->link_config.lane_count); + if (!status) + return TS_CHANNEL_EQUALIZATION; + + /* + * Check if the same voltage swing for each lane has been used 5 + * consecutive times. + */ + if (prev_vs_level == dp_tx->link_config.vs_level) { + same_vs_level_count++; + } else { + same_vs_level_count = 0; + prev_vs_level = dp_tx->link_config.vs_level; + } + if (same_vs_level_count >= 5) + break; + + /* Only try maximum voltage swing once. */ + if (dp_tx->link_config.vs_level == MAXIMUM_VS_LEVEL) + break; + + /* Adjust the drive settings as requested by the RX device. */ + status = adj_vswing_preemp(dev); + if (status) + /* The AUX write failed. */ + return TS_FAILURE; + } + + return TS_ADJUST_LINK_RATE; +} + +/** + * training_state_channel_equalization() - Run channel equalization part of + * link training + * @dev: The LogiCore DP TX device in question + * + * Run the channel equalization sequence as part of link + * training. The sequence is as follows: + * + * 0) Start signaling with the same drive settings used at the end of the + * clock recovery sequence. + * 1) Transmit training pattern 2 (or 3) over the main link with symbol + * scrambling disabled. + * 2) The channel equalization loop. If channel equalization is + * unsuccessful after 5 loop iterations, return. + * 2a) Wait for at least the period of time specified in the RX device's + * DisplayPort Configuration data (DPCD) register, + * TRAINING_AUX_RD_INTERVAL. + * 2b) Check if all lanes have achieved channel equalization, symbol lock, + * and interlane alignment. If so, return. + * 2c) Check if the same voltage swing level has been used 5 consecutive + * times or if the maximum level has been reached. If so, return. + * 2d) Adjust the voltage swing, pre-emphasis, and post-cursor levels as + * requested by the RX device. + * 2e) Loop back to 2a. + * + * For a more detailed description of the channel equalization sequence, see + * section 3.5.1.2.2 of the DisplayPort 1.2a specification document. + * + * Return: The next state machine state to advance to + */ +static int training_state_channel_equalization(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + u32 delay_us; + u32 iteration_count = 0; + + /* + * Obtain the required delay for channel equalization as specified by + * the RX device. + */ + delay_us = get_training_delay(dev, TS_CHANNEL_EQUALIZATION); + + /* Start channel equalization. */ + + /* Write the current drive settings. */ + /* Transmit training pattern 2/3. */ + if (dp_tx->dpcd_rx_caps[DPCD_MAX_LANE_COUNT] & DPCD_TPS3_SUPPORT_MASK) + status = set_training_pattern(dev, TRAINING_PATTERN_SET_TP3); + else + status = set_training_pattern(dev, TRAINING_PATTERN_SET_TP2); + + if (status) + return TS_FAILURE; + + while (iteration_count < 5) { + /* Wait delay specified in TRAINING_AUX_RD_INTERVAL. */ + udelay(delay_us); + + /* Get lane and adjustment requests. */ + status = get_lane_status_adj_reqs(dev); + if (status) + /* The AUX read failed. */ + return TS_FAILURE; + + /* Check that all lanes still have their clocks locked. */ + status = check_clock_recovery(dev, + dp_tx->link_config.lane_count); + if (status) + break; + + /* + * Check if all lanes have accomplished channel equalization, + * symbol lock, and interlane alignment. + */ + status = + check_channel_equalization(dev, + dp_tx->link_config.lane_count); + if (!status) + return TS_SUCCESS; + + /* Adjust the drive settings as requested by the RX device. */ + status = adj_vswing_preemp(dev); + if (status) + /* The AUX write failed. */ + return TS_FAILURE; + + iteration_count++; + } + + /* + * Tried 5 times with no success. Try a reduced bitrate first, then + * reduce the number of lanes. + */ + return TS_ADJUST_LINK_RATE; +} + +/** + * training_state_adjust_link_rate() - Downshift data rate and/or lane count + * @dev: The LogiCore DP TX device in question + * + * This function is reached if either the clock recovery or the channel + * equalization process failed during training. As a result, the data rate will + * be downshifted, and training will be re-attempted (starting with clock + * recovery) at the reduced data rate. If the data rate is already at 1.62 + * Gbps, a downshift in lane count will be attempted. + * + * Return: The next state machine state to advance to + */ +static int training_state_adjust_link_rate(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + + switch (dp_tx->link_config.link_rate) { + case LINK_BW_SET_540GBPS: + status = set_link_rate(dev, LINK_BW_SET_270GBPS); + if (status) { + status = TS_FAILURE; + break; + } + status = TS_CLOCK_RECOVERY; + break; + case LINK_BW_SET_270GBPS: + status = set_link_rate(dev, LINK_BW_SET_162GBPS); + if (status) { + status = TS_FAILURE; + break; + } + status = TS_CLOCK_RECOVERY; + break; + default: + /* + * Already at the lowest link rate. Try reducing the lane + * count next. + */ + status = TS_ADJUST_LANE_COUNT; + break; + } + + return status; +} + +/** + * trainig_state_adjust_lane_count - Downshift lane count + * @dev: The LogiCore DP TX device in question + * + * This function is reached if either the clock recovery or the channel + * equalization process failed during training, and a minimal data rate of 1.62 + * Gbps was being used. As a result, the number of lanes in use will be + * reduced, and training will be re-attempted (starting with clock recovery) at + * this lower lane count. + * + * Return: The next state machine state to advance to + */ +static int trainig_state_adjust_lane_count(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + + switch (dp_tx->link_config.lane_count) { + case LANE_COUNT_SET_4: + status = set_lane_count(dev, LANE_COUNT_SET_2); + if (status) { + status = TS_FAILURE; + break; + } + + status = set_link_rate(dev, dp_tx->link_config.max_link_rate); + if (status) { + status = TS_FAILURE; + break; + } + status = TS_CLOCK_RECOVERY; + break; + case LANE_COUNT_SET_2: + status = set_lane_count(dev, LANE_COUNT_SET_1); + if (status) { + status = TS_FAILURE; + break; + } + + status = set_link_rate(dev, dp_tx->link_config.max_link_rate); + if (status) { + status = TS_FAILURE; + break; + } + status = TS_CLOCK_RECOVERY; + break; + default: + /* + * Already at the lowest lane count. Training has failed at the + * lowest lane count and link rate. + */ + status = TS_FAILURE; + break; + } + + return status; +} + +/** + * check_link_status() - Check status of link + * @dev: The LogiCore DP TX device in question + * @lane_count: The lane count to use for the check + * + * Check if the receiver's DisplayPort Configuration data (DPCD) indicates the + * receiver has achieved and maintained clock recovery, channel equalization, + * symbol lock, and interlane alignment for all lanes currently in use. + * + * Return: 0 if the link status is OK, -ve if a error occurred during checking + */ +static int check_link_status(struct udevice *dev, u8 lane_count) +{ + u8 retry_count = 0; + + if (!is_connected(dev)) + return -ENODEV; + + /* Retrieve AUX info. */ + do { + int status; + + /* Get lane and adjustment requests. */ + status = get_lane_status_adj_reqs(dev); + if (status) + return -EIO; + + /* Check if the link needs training. */ + if ((check_clock_recovery(dev, lane_count) == 0) && + (check_channel_equalization(dev, lane_count) == 0)) + return 0; + + retry_count++; + } while (retry_count < 5); /* Retry up to 5 times. */ + + return -EIO; +} + +/** + * run_training() - Run link training + * @dev: The LogiCore DP TX device in question + * + * Run the link training process. It is implemented as a state machine, with + * each state returning the next state. First, the clock recovery sequence will + * be run; if successful, the channel equalization sequence will run. If either + * the clock recovery or channel equalization sequence failed, the link rate or + * the number of lanes used will be reduced and training will be re-attempted. + * If training fails at the minimal data rate, 1.62 Gbps with a single lane, + * training will no longer re-attempt and fail. + * + * ### Here be dragons ### + * There are undocumented timeout constraints in the link training process. In + * DP v1.2a spec, Chapter 3.5.1.2.2 a 10ms limit for the complete training + * process is mentioned. Which individual timeouts are derived and implemented + * by sink manufacturers is unknown. So each step should be as short as + * possible and link training should start as soon as possible after HPD. + * + * Return: 0 if the training sequence ran successfully, -ve if a error occurred + * or the training failed + */ +static int run_training(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + int training_state = TS_CLOCK_RECOVERY; + + while (1) { + switch (training_state) { + case TS_CLOCK_RECOVERY: + training_state = + training_state_clock_recovery(dev); + break; + case TS_CHANNEL_EQUALIZATION: + training_state = + training_state_channel_equalization(dev); + break; + case TS_ADJUST_LINK_RATE: + training_state = + training_state_adjust_link_rate(dev); + break; + case TS_ADJUST_LANE_COUNT: + training_state = + trainig_state_adjust_lane_count(dev); + break; + default: + break; + } + + if (training_state == TS_SUCCESS) + break; + else if (training_state == TS_FAILURE) + return -EIO; + + if (training_state == TS_ADJUST_LINK_RATE || + training_state == TS_ADJUST_LANE_COUNT) { + if (!dp_tx->train_adaptive) + return -EIO; + + status = set_training_pattern(dev, + TRAINING_PATTERN_SET_OFF); + if (status) + return -EIO; + } + } + + /* Final status check. */ + status = check_link_status(dev, dp_tx->link_config.lane_count); + if (status) + return -EIO; + + return 0; +} + +/* Link policy maker */ + +/** + * cfg_main_link_max() - Determine best common capabilities + * @dev: The LogiCore DP TX device in question + * + * Determine the common capabilities between the DisplayPort TX core and the RX + * device. + * + * Return: 0 if the determination succeeded, -ve on error + */ +static int cfg_main_link_max(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + + if (!is_connected(dev)) + return -ENODEV; + + /* + * Configure the main link to the maximum common link rate between the + * DisplayPort TX core and the RX device. + */ + status = set_link_rate(dev, dp_tx->link_config.max_link_rate); + if (status) + return status; + + /* + * Configure the main link to the maximum common lane count between the + * DisplayPort TX core and the RX device. + */ + status = set_lane_count(dev, dp_tx->link_config.max_lane_count); + if (status) + return status; + + return 0; +} + +/** + * establish_link() - Establish a link + * @dev: The LogiCore DP TX device in question + * + * Check if the link needs training and run the training sequence if training + * is required. + * + * Return: 0 if the link was established successfully, -ve on error + */ +static int establish_link(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int status; + int status2; + u32 mask; + + reset_dp_phy(dev, PHY_CONFIG_PHY_RESET_MASK); + + /* Disable main link during training. */ + disable_main_link(dev); + + /* Wait for the PHY to be ready. */ + mask = phy_status_lanes_ready_mask(dp_tx->max_lane_count); + status = wait_phy_ready(dev, mask); + if (status) + return -EIO; + + /* Train main link. */ + status = run_training(dev); + + /* Turn off the training pattern and enable scrambler. */ + status2 = set_training_pattern(dev, TRAINING_PATTERN_SET_OFF); + if (status || status2) + return -EIO; + + return 0; +} + +/* + * Stream policy maker + */ + +/** + * cfg_msa_recalculate() - Calculate MSA parameters + * @dev: The LogiCore DP TX device in question + * + * Calculate the following Main Stream Attributes (MSA): + * - Transfer unit size + * - User pixel width + * - Horizontal total clock + * - Vertical total clock + * - misc_0 + * - misc_1 + * - Data per lane + * - Average number of bytes per transfer unit + * - Number of initial wait cycles + * + * These values are derived from: + * - Bits per color + * - Horizontal resolution + * - Vertical resolution + * - Horizontal blank start + * - Vertical blank start + * - Pixel clock (in KHz) + * - Horizontal sync polarity + * - Vertical sync polarity + * - Horizontal sync pulse width + * - Vertical sync pulse width + */ +static void cfg_msa_recalculate(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u32 video_bw; + u32 link_bw; + u32 words_per_line; + u8 bits_per_pixel; + struct main_stream_attributes *msa_config; + struct link_config *link_config; + + msa_config = &dp_tx->main_stream_attributes; + link_config = &dp_tx->link_config; + + /* + * Set the user pixel width to handle clocks that exceed the + * capabilities of the DisplayPort TX core. + */ + if (msa_config->override_user_pixel_width == 0) { + if (msa_config->pixel_clock_hz > 300000000 && + link_config->lane_count == LANE_COUNT_SET_4) { + msa_config->user_pixel_width = 4; + } /* + * Xilinx driver used 75 MHz as a limit here, 150 MHZ should + * be more sane + */ + else if ((msa_config->pixel_clock_hz > 150000000) && + (link_config->lane_count != LANE_COUNT_SET_1)) { + msa_config->user_pixel_width = 2; + } else { + msa_config->user_pixel_width = 1; + } + } + + /* Compute the rest of the MSA values. */ + msa_config->n_vid = 27 * 1000 * link_config->link_rate; + + /* Miscellaneous attributes. */ + if (msa_config->bits_per_color == 6) + msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_6BPC; + else if (msa_config->bits_per_color == 8) + msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_8BPC; + else if (msa_config->bits_per_color == 10) + msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_10BPC; + else if (msa_config->bits_per_color == 12) + msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_12BPC; + else if (msa_config->bits_per_color == 16) + msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_16BPC; + + msa_config->misc_0 = (msa_config->misc_0 << + MAIN_STREAMX_MISC0_BDC_SHIFT) | + (msa_config->y_cb_cr_colorimetry << + MAIN_STREAMX_MISC0_YCBCR_COLORIMETRY_SHIFT) | + (msa_config->dynamic_range << + MAIN_STREAMX_MISC0_DYNAMIC_RANGE_SHIFT) | + (msa_config->component_format << + MAIN_STREAMX_MISC0_COMPONENT_FORMAT_SHIFT) | + (msa_config->synchronous_clock_mode); + + msa_config->misc_1 = 0; + + /* + * Determine the number of bits per pixel for the specified color + * component format. + */ + if (msa_config->component_format == + MAIN_STREAMX_MISC0_COMPONENT_FORMAT_YCBCR422) + /* YCbCr422 color component format. */ + bits_per_pixel = msa_config->bits_per_color * 2; + else + /* RGB or YCbCr 4:4:4 color component format. */ + bits_per_pixel = msa_config->bits_per_color * 3; + + /* Calculate the data per lane. */ + words_per_line = (msa_config->h_active * bits_per_pixel); + if (words_per_line % 16) + words_per_line += 16; + words_per_line /= 16; + + msa_config->data_per_lane = words_per_line - link_config->lane_count; + if (words_per_line % link_config->lane_count) + msa_config->data_per_lane += (words_per_line % + link_config->lane_count); + + /* + * Allocate a fixed size for single-stream transport (SST) + * operation. + */ + msa_config->transfer_unit_size = 64; + + /* + * Calculate the average number of bytes per transfer unit. + * Note: Both the integer and the fractional part is stored in + * avg_bytes_per_tu. + */ + video_bw = ((msa_config->pixel_clock_hz / 1000) * bits_per_pixel) / 8; + link_bw = (link_config->lane_count * link_config->link_rate * 27); + msa_config->avg_bytes_per_tu = (video_bw * + msa_config->transfer_unit_size) / + link_bw; + + /* + * The number of initial wait cycles at the start of a new line + * by the framing logic. This allows enough data to be buffered + * in the input FIFO before video is sent. + */ + if ((msa_config->avg_bytes_per_tu / 1000) <= 4) + msa_config->init_wait = 64; + else + msa_config->init_wait = msa_config->transfer_unit_size - + (msa_config->avg_bytes_per_tu / 1000); +} + +/** + * set_line_reset() - Enable/Disable end-of-line-reset + * @dev: The LogiCore DP TX device in question + * + * Disable/enable the end-of-line-reset to the internal video pipe in case of + * reduced blanking as required. + */ +static void set_line_reset(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + u32 reg_val; + u16 h_blank; + u16 h_reduced_blank; + struct main_stream_attributes *msa_config = + &dp_tx->main_stream_attributes; + + h_blank = msa_config->h_total - msa_config->h_active; + /* Reduced blanking starts at ceil(0.2 * HTotal). */ + h_reduced_blank = 2 * msa_config->h_total; + if (h_reduced_blank % 10) + h_reduced_blank += 10; + h_reduced_blank /= 10; + + /* CVT spec. states h_blank is either 80 or 160 for reduced blanking. */ + reg_val = get_reg(dev, REG_LINE_RESET_DISABLE); + if (h_blank < h_reduced_blank && + (h_blank == 80 || h_blank == 160)) { + reg_val |= LINE_RESET_DISABLE_MASK; + } else { + reg_val &= ~LINE_RESET_DISABLE_MASK; + } + set_reg(dev, REG_LINE_RESET_DISABLE, reg_val); +} + +/** + * clear_msa_values() - Clear MSA values + * @dev: The LogiCore DP TX device in question + * + * Clear the main stream attributes registers of the DisplayPort TX core. + */ +static void clear_msa_values(struct udevice *dev) +{ + set_reg(dev, REG_MAIN_STREAM_HTOTAL, 0); + set_reg(dev, REG_MAIN_STREAM_VTOTAL, 0); + set_reg(dev, REG_MAIN_STREAM_POLARITY, 0); + set_reg(dev, REG_MAIN_STREAM_HSWIDTH, 0); + set_reg(dev, REG_MAIN_STREAM_VSWIDTH, 0); + set_reg(dev, REG_MAIN_STREAM_HRES, 0); + set_reg(dev, REG_MAIN_STREAM_VRES, 0); + set_reg(dev, REG_MAIN_STREAM_HSTART, 0); + set_reg(dev, REG_MAIN_STREAM_VSTART, 0); + set_reg(dev, REG_MAIN_STREAM_MISC0, 0); + set_reg(dev, REG_MAIN_STREAM_MISC1, 0); + set_reg(dev, REG_USER_PIXEL_WIDTH, 0); + set_reg(dev, REG_USER_DATA_COUNT_PER_LANE, 0); + set_reg(dev, REG_M_VID, 0); + set_reg(dev, REG_N_VID, 0); + + set_reg(dev, REG_STREAM1, 0); + set_reg(dev, REG_TU_SIZE, 0); + set_reg(dev, REG_MIN_BYTES_PER_TU, 0); + set_reg(dev, REG_FRAC_BYTES_PER_TU, 0); + set_reg(dev, REG_INIT_WAIT, 0); +} + +/** + * set_msa_values() - Set MSA values + * @dev: The LogiCore DP TX device in question + * + * Set the main stream attributes registers of the DisplayPort TX + * core with the values specified in the main stream attributes configuration + * structure. + */ +static void set_msa_values(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + struct main_stream_attributes *msa_config = + &dp_tx->main_stream_attributes; + + printf(" set MSA %u x %u\n", msa_config->h_active, + msa_config->v_active); + + set_reg(dev, REG_MAIN_STREAM_HTOTAL, msa_config->h_total); + set_reg(dev, REG_MAIN_STREAM_VTOTAL, msa_config->v_total); + set_reg(dev, REG_MAIN_STREAM_POLARITY, + msa_config->h_sync_polarity | + (msa_config->v_sync_polarity << + MAIN_STREAMX_POLARITY_VSYNC_POL_SHIFT)); + set_reg(dev, REG_MAIN_STREAM_HSWIDTH, msa_config->h_sync_width); + set_reg(dev, REG_MAIN_STREAM_VSWIDTH, msa_config->v_sync_width); + set_reg(dev, REG_MAIN_STREAM_HRES, msa_config->h_active); + set_reg(dev, REG_MAIN_STREAM_VRES, msa_config->v_active); + set_reg(dev, REG_MAIN_STREAM_HSTART, msa_config->h_start); + set_reg(dev, REG_MAIN_STREAM_VSTART, msa_config->v_start); + set_reg(dev, REG_MAIN_STREAM_MISC0, msa_config->misc_0); + set_reg(dev, REG_MAIN_STREAM_MISC1, msa_config->misc_1); + set_reg(dev, REG_USER_PIXEL_WIDTH, msa_config->user_pixel_width); + + set_reg(dev, REG_M_VID, msa_config->pixel_clock_hz / 1000); + set_reg(dev, REG_N_VID, msa_config->n_vid); + set_reg(dev, REG_USER_DATA_COUNT_PER_LANE, msa_config->data_per_lane); + + set_line_reset(dev); + + set_reg(dev, REG_TU_SIZE, msa_config->transfer_unit_size); + set_reg(dev, REG_MIN_BYTES_PER_TU, msa_config->avg_bytes_per_tu / 1000); + set_reg(dev, REG_FRAC_BYTES_PER_TU, + (msa_config->avg_bytes_per_tu % 1000) * 1024 / 1000); + set_reg(dev, REG_INIT_WAIT, msa_config->init_wait); +} + +/* + * external API + */ + +/** + * logicore_dp_tx_set_msa() - Set given MSA values on device + * @dev: The LogiCore DP TX device in question + * @msa: The MSA values to set for the device + */ +static void logicore_dp_tx_set_msa(struct udevice *dev, + struct logicore_dp_tx_msa *msa) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + + memset(&dp_tx->main_stream_attributes, 0, + sizeof(struct main_stream_attributes)); + + dp_tx->main_stream_attributes.pixel_clock_hz = msa->pixel_clock_hz; + dp_tx->main_stream_attributes.bits_per_color = msa->bits_per_color; + dp_tx->main_stream_attributes.h_active = msa->h_active; + dp_tx->main_stream_attributes.h_start = msa->h_start; + dp_tx->main_stream_attributes.h_sync_polarity = msa->h_sync_polarity; + dp_tx->main_stream_attributes.h_sync_width = msa->h_sync_width; + dp_tx->main_stream_attributes.h_total = msa->h_total; + dp_tx->main_stream_attributes.v_active = msa->v_active; + dp_tx->main_stream_attributes.v_start = msa->v_start; + dp_tx->main_stream_attributes.v_sync_polarity = msa->v_sync_polarity; + dp_tx->main_stream_attributes.v_sync_width = msa->v_sync_width; + dp_tx->main_stream_attributes.v_total = msa->v_total; + dp_tx->main_stream_attributes.override_user_pixel_width = + msa->override_user_pixel_width; + dp_tx->main_stream_attributes.user_pixel_width = msa->user_pixel_width; + dp_tx->main_stream_attributes.synchronous_clock_mode = 0; +} + +/** + * logicore_dp_tx_video_enable() - Enable video output + * @dev: The LogiCore DP TX device in question + * @msa: The MSA values to set for the device + * + * Return: 0 if the video was enabled successfully, -ve on error + */ +static int logicore_dp_tx_video_enable(struct udevice *dev, + struct logicore_dp_tx_msa *msa) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + int res; + u8 power = 0x01; + + if (!is_connected(dev)) { + printf(" no DP sink connected\n"); + return -EIO; + } + + initialize(dev); + + disable_main_link(dev); + + logicore_dp_tx_set_msa(dev, msa); + + get_rx_capabilities(dev); + + printf(" DP sink connected\n"); + aux_write(dev, DPCD_SET_POWER_DP_PWR_VOLTAGE, 1, &power); + set_enhanced_frame_mode(dev, true); + cfg_main_link_max(dev); + res = establish_link(dev); + printf(" establish_link: %s, vs: %d, pe: %d\n", + res ? "failed" : "ok", dp_tx->link_config.vs_level, + dp_tx->link_config.pe_level); + + cfg_msa_recalculate(dev); + + clear_msa_values(dev); + set_msa_values(dev); + + enable_main_link(dev); + + return 0; +} + +/* + * Driver functions + */ + +static int logicore_dp_tx_enable(struct udevice *dev, int panel_bpp, + const struct display_timing *timing) +{ + struct clk pixclock; + struct logicore_dp_tx_msa *msa; + struct logicore_dp_tx_msa mode_640_480_60 = { + .pixel_clock_hz = 25175000, + .bits_per_color = 8, + .h_active = 640, + .h_start = 144, + .h_sync_polarity = false, + .h_sync_width = 96, + .h_total = 800, + .v_active = 480, + .v_start = 35, + .v_sync_polarity = false, + .v_sync_width = 2, + .v_total = 525, + .override_user_pixel_width = false, + .user_pixel_width = 0, + }; + + struct logicore_dp_tx_msa mode_720_400_70 = { + .pixel_clock_hz = 28300000, + .bits_per_color = 8, + .h_active = 720, + .h_start = 162, + .h_sync_polarity = false, + .h_sync_width = 108, + .h_total = 900, + .v_active = 400, + .v_start = 37, + .v_sync_polarity = true, + .v_sync_width = 2, + .v_total = 449, + .override_user_pixel_width = false, + .user_pixel_width = 0, + }; + + struct logicore_dp_tx_msa mode_1024_768_60 = { + .pixel_clock_hz = 65000000, + .bits_per_color = 8, + .h_active = 1024, + .h_start = 296, + .h_sync_polarity = false, + .h_sync_width = 136, + .h_total = 1344, + .v_active = 768, + .v_start = 35, + .v_sync_polarity = false, + .v_sync_width = 2, + .v_total = 806, + .override_user_pixel_width = false, + .user_pixel_width = 0, + }; + + if (timing->hactive.typ == 1024 && timing->vactive.typ == 768) + msa = &mode_1024_768_60; + else if (timing->hactive.typ == 720 && timing->vactive.typ == 400) + msa = &mode_720_400_70; + else + msa = &mode_640_480_60; + + if (clk_get_by_index(dev, 0, &pixclock)) { + printf("%s: Could not get pixelclock\n", dev->name); + return -1; + } + clk_set_rate(&pixclock, msa->pixel_clock_hz); + + return logicore_dp_tx_video_enable(dev, msa); +} + +static int logicore_dp_tx_probe(struct udevice *dev) +{ + struct dp_tx *dp_tx = dev_get_priv(dev); + + dp_tx->s_axi_clk = S_AXI_CLK_DEFAULT; + dp_tx->train_adaptive = false; + dp_tx->max_link_rate = DPCD_MAX_LINK_RATE_540GBPS; + dp_tx->max_lane_count = DPCD_MAX_LANE_COUNT_4; + + dp_tx->base = dev_read_u32_default(dev, "reg", -1); + + return 0; +} + +static const struct dm_display_ops logicore_dp_tx_ops = { + .enable = logicore_dp_tx_enable, +}; + +static const struct udevice_id logicore_dp_tx_ids[] = { + { .compatible = "gdsys,logicore_dp_tx" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(logicore_dp_tx) = { + .name = "logicore_dp_tx", + .id = UCLASS_DISPLAY, + .of_match = logicore_dp_tx_ids, + .probe = logicore_dp_tx_probe, + .priv_auto_alloc_size = sizeof(struct dp_tx), + .ops = &logicore_dp_tx_ops, +}; |