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|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*
* based in parts on udlfb.c:
* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "udl_drv.h"
#define UDL_COLOR_DEPTH_16BPP 0
/*
* All DisplayLink bulk operations start with 0xAF, followed by specific code
* All operations are written to buffers which then later get sent to device
*/
static char *udl_set_register(char *buf, u8 reg, u8 val)
{
*buf++ = 0xAF;
*buf++ = 0x20;
*buf++ = reg;
*buf++ = val;
return buf;
}
static char *udl_vidreg_lock(char *buf)
{
return udl_set_register(buf, 0xFF, 0x00);
}
static char *udl_vidreg_unlock(char *buf)
{
return udl_set_register(buf, 0xFF, 0xFF);
}
static char *udl_set_blank_mode(char *buf, u8 mode)
{
return udl_set_register(buf, UDL_REG_BLANK_MODE, mode);
}
static char *udl_set_color_depth(char *buf, u8 selection)
{
return udl_set_register(buf, 0x00, selection);
}
static char *udl_set_base16bpp(char *wrptr, u32 base)
{
/* the base pointer is 16 bits wide, 0x20 is hi byte. */
wrptr = udl_set_register(wrptr, 0x20, base >> 16);
wrptr = udl_set_register(wrptr, 0x21, base >> 8);
return udl_set_register(wrptr, 0x22, base);
}
/*
* DisplayLink HW has separate 16bpp and 8bpp framebuffers.
* In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
*/
static char *udl_set_base8bpp(char *wrptr, u32 base)
{
wrptr = udl_set_register(wrptr, 0x26, base >> 16);
wrptr = udl_set_register(wrptr, 0x27, base >> 8);
return udl_set_register(wrptr, 0x28, base);
}
static char *udl_set_register_16(char *wrptr, u8 reg, u16 value)
{
wrptr = udl_set_register(wrptr, reg, value >> 8);
return udl_set_register(wrptr, reg+1, value);
}
/*
* This is kind of weird because the controller takes some
* register values in a different byte order than other registers.
*/
static char *udl_set_register_16be(char *wrptr, u8 reg, u16 value)
{
wrptr = udl_set_register(wrptr, reg, value);
return udl_set_register(wrptr, reg+1, value >> 8);
}
/*
* LFSR is linear feedback shift register. The reason we have this is
* because the display controller needs to minimize the clock depth of
* various counters used in the display path. So this code reverses the
* provided value into the lfsr16 value by counting backwards to get
* the value that needs to be set in the hardware comparator to get the
* same actual count. This makes sense once you read above a couple of
* times and think about it from a hardware perspective.
*/
static u16 udl_lfsr16(u16 actual_count)
{
u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
while (actual_count--) {
lv = ((lv << 1) |
(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
& 0xFFFF;
}
return (u16) lv;
}
/*
* This does LFSR conversion on the value that is to be written.
* See LFSR explanation above for more detail.
*/
static char *udl_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
{
return udl_set_register_16(wrptr, reg, udl_lfsr16(value));
}
/*
* This takes a standard fbdev screeninfo struct and all of its monitor mode
* details and converts them into the DisplayLink equivalent register commands.
ERR(vreg(dev, 0x00, (color_depth == 16) ? 0 : 1));
ERR(vreg_lfsr16(dev, 0x01, xDisplayStart));
ERR(vreg_lfsr16(dev, 0x03, xDisplayEnd));
ERR(vreg_lfsr16(dev, 0x05, yDisplayStart));
ERR(vreg_lfsr16(dev, 0x07, yDisplayEnd));
ERR(vreg_lfsr16(dev, 0x09, xEndCount));
ERR(vreg_lfsr16(dev, 0x0B, hSyncStart));
ERR(vreg_lfsr16(dev, 0x0D, hSyncEnd));
ERR(vreg_big_endian(dev, 0x0F, hPixels));
ERR(vreg_lfsr16(dev, 0x11, yEndCount));
ERR(vreg_lfsr16(dev, 0x13, vSyncStart));
ERR(vreg_lfsr16(dev, 0x15, vSyncEnd));
ERR(vreg_big_endian(dev, 0x17, vPixels));
ERR(vreg_little_endian(dev, 0x1B, pixelClock5KHz));
ERR(vreg(dev, 0x1F, 0));
ERR(vbuf(dev, WRITE_VIDREG_UNLOCK, DSIZEOF(WRITE_VIDREG_UNLOCK)));
*/
static char *udl_set_vid_cmds(char *wrptr, struct drm_display_mode *mode)
{
u16 xds, yds;
u16 xde, yde;
u16 yec;
/* x display start */
xds = mode->crtc_htotal - mode->crtc_hsync_start;
wrptr = udl_set_register_lfsr16(wrptr, 0x01, xds);
/* x display end */
xde = xds + mode->crtc_hdisplay;
wrptr = udl_set_register_lfsr16(wrptr, 0x03, xde);
/* y display start */
yds = mode->crtc_vtotal - mode->crtc_vsync_start;
wrptr = udl_set_register_lfsr16(wrptr, 0x05, yds);
/* y display end */
yde = yds + mode->crtc_vdisplay;
wrptr = udl_set_register_lfsr16(wrptr, 0x07, yde);
/* x end count is active + blanking - 1 */
wrptr = udl_set_register_lfsr16(wrptr, 0x09,
mode->crtc_htotal - 1);
/* libdlo hardcodes hsync start to 1 */
wrptr = udl_set_register_lfsr16(wrptr, 0x0B, 1);
/* hsync end is width of sync pulse + 1 */
wrptr = udl_set_register_lfsr16(wrptr, 0x0D,
mode->crtc_hsync_end - mode->crtc_hsync_start + 1);
/* hpixels is active pixels */
wrptr = udl_set_register_16(wrptr, 0x0F, mode->hdisplay);
/* yendcount is vertical active + vertical blanking */
yec = mode->crtc_vtotal;
wrptr = udl_set_register_lfsr16(wrptr, 0x11, yec);
/* libdlo hardcodes vsync start to 0 */
wrptr = udl_set_register_lfsr16(wrptr, 0x13, 0);
/* vsync end is width of vsync pulse */
wrptr = udl_set_register_lfsr16(wrptr, 0x15, mode->crtc_vsync_end - mode->crtc_vsync_start);
/* vpixels is active pixels */
wrptr = udl_set_register_16(wrptr, 0x17, mode->crtc_vdisplay);
wrptr = udl_set_register_16be(wrptr, 0x1B,
mode->clock / 5);
return wrptr;
}
static char *udl_dummy_render(char *wrptr)
{
*wrptr++ = 0xAF;
*wrptr++ = 0x6A; /* copy */
*wrptr++ = 0x00; /* from addr */
*wrptr++ = 0x00;
*wrptr++ = 0x00;
*wrptr++ = 0x01; /* one pixel */
*wrptr++ = 0x00; /* to address */
*wrptr++ = 0x00;
*wrptr++ = 0x00;
return wrptr;
}
static long udl_log_cpp(unsigned int cpp)
{
if (WARN_ON(!is_power_of_2(cpp)))
return -EINVAL;
return __ffs(cpp);
}
static int udl_handle_damage(struct drm_framebuffer *fb,
const struct iosys_map *map,
const struct drm_rect *clip)
{
struct drm_device *dev = fb->dev;
void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */
int i, ret;
char *cmd;
struct urb *urb;
int log_bpp;
ret = udl_log_cpp(fb->format->cpp[0]);
if (ret < 0)
return ret;
log_bpp = ret;
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
if (ret)
return ret;
urb = udl_get_urb(dev);
if (!urb) {
ret = -ENOMEM;
goto out_drm_gem_fb_end_cpu_access;
}
cmd = urb->transfer_buffer;
for (i = clip->y1; i < clip->y2; i++) {
const int line_offset = fb->pitches[0] * i;
const int byte_offset = line_offset + (clip->x1 << log_bpp);
const int dev_byte_offset = (fb->width * i + clip->x1) << log_bpp;
const int byte_width = drm_rect_width(clip) << log_bpp;
ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr,
&cmd, byte_offset, dev_byte_offset,
byte_width);
if (ret)
goto out_drm_gem_fb_end_cpu_access;
}
if (cmd > (char *)urb->transfer_buffer) {
/* Send partial buffer remaining before exiting */
int len;
if (cmd < (char *)urb->transfer_buffer + urb->transfer_buffer_length)
*cmd++ = 0xAF;
len = cmd - (char *)urb->transfer_buffer;
ret = udl_submit_urb(dev, urb, len);
} else {
udl_urb_completion(urb);
}
ret = 0;
out_drm_gem_fb_end_cpu_access:
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
return ret;
}
/*
* Primary plane
*/
static const uint32_t udl_primary_plane_formats[] = {
DRM_FORMAT_RGB565,
DRM_FORMAT_XRGB8888,
};
static const uint64_t udl_primary_plane_fmtmods[] = {
DRM_FORMAT_MOD_LINEAR,
DRM_FORMAT_MOD_INVALID
};
static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane,
struct drm_atomic_state *state)
{
struct drm_device *dev = plane->dev;
struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
struct drm_rect rect;
int idx;
if (!drm_dev_enter(dev, &idx))
return;
if (!fb)
return; /* no framebuffer; plane is disabled */
if (drm_atomic_helper_damage_merged(old_plane_state, plane_state, &rect))
udl_handle_damage(fb, &shadow_plane_state->data[0], &rect);
drm_dev_exit(idx);
}
static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = {
DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
.atomic_check = drm_plane_helper_atomic_check,
.atomic_update = udl_primary_plane_helper_atomic_update,
};
static const struct drm_plane_funcs udl_primary_plane_funcs = {
.update_plane = drm_atomic_helper_update_plane,
.disable_plane = drm_atomic_helper_disable_plane,
.destroy = drm_plane_cleanup,
DRM_GEM_SHADOW_PLANE_FUNCS,
};
/*
* CRTC
*/
static int udl_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
return drm_atomic_helper_check_crtc_state(new_crtc_state, false);
}
static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
struct drm_device *dev = crtc->dev;
struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
struct drm_display_mode *mode = &crtc_state->mode;
struct urb *urb;
char *buf;
int idx;
if (!drm_dev_enter(dev, &idx))
return;
urb = udl_get_urb(dev);
if (!urb)
goto out;
buf = (char *)urb->transfer_buffer;
buf = udl_vidreg_lock(buf);
buf = udl_set_color_depth(buf, UDL_COLOR_DEPTH_16BPP);
/* set base for 16bpp segment to 0 */
buf = udl_set_base16bpp(buf, 0);
/* set base for 8bpp segment to end of fb */
buf = udl_set_base8bpp(buf, 2 * mode->vdisplay * mode->hdisplay);
buf = udl_set_vid_cmds(buf, mode);
buf = udl_set_blank_mode(buf, UDL_BLANK_MODE_ON);
buf = udl_vidreg_unlock(buf);
buf = udl_dummy_render(buf);
udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
out:
drm_dev_exit(idx);
}
static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
struct drm_device *dev = crtc->dev;
struct urb *urb;
char *buf;
int idx;
if (!drm_dev_enter(dev, &idx))
return;
urb = udl_get_urb(dev);
if (!urb)
goto out;
buf = (char *)urb->transfer_buffer;
buf = udl_vidreg_lock(buf);
buf = udl_set_blank_mode(buf, UDL_BLANK_MODE_POWERDOWN);
buf = udl_vidreg_unlock(buf);
buf = udl_dummy_render(buf);
udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
out:
drm_dev_exit(idx);
}
static const struct drm_crtc_helper_funcs udl_crtc_helper_funcs = {
.atomic_check = udl_crtc_helper_atomic_check,
.atomic_enable = udl_crtc_helper_atomic_enable,
.atomic_disable = udl_crtc_helper_atomic_disable,
};
static const struct drm_crtc_funcs udl_crtc_funcs = {
.reset = drm_atomic_helper_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
};
/*
* Encoder
*/
static const struct drm_encoder_funcs udl_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
/*
* Connector
*/
static int udl_connector_helper_get_modes(struct drm_connector *connector)
{
struct udl_connector *udl_connector = to_udl_connector(connector);
drm_connector_update_edid_property(connector, udl_connector->edid);
if (udl_connector->edid)
return drm_add_edid_modes(connector, udl_connector->edid);
return 0;
}
static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
.get_modes = udl_connector_helper_get_modes,
};
static int udl_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
{
struct udl_device *udl = data;
struct drm_device *dev = &udl->drm;
struct usb_device *udev = udl_to_usb_device(udl);
u8 *read_buff;
int ret;
size_t i;
read_buff = kmalloc(2, GFP_KERNEL);
if (!read_buff)
return -ENOMEM;
for (i = 0; i < len; i++) {
int bval = (i + block * EDID_LENGTH) << 8;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
0x02, (0x80 | (0x02 << 5)), bval,
0xA1, read_buff, 2, USB_CTRL_GET_TIMEOUT);
if (ret < 0) {
drm_err(dev, "Read EDID byte %zu failed err %x\n", i, ret);
goto err_kfree;
} else if (ret < 1) {
ret = -EIO;
drm_err(dev, "Read EDID byte %zu failed\n", i);
goto err_kfree;
}
buf[i] = read_buff[1];
}
kfree(read_buff);
return 0;
err_kfree:
kfree(read_buff);
return ret;
}
static enum drm_connector_status udl_connector_detect(struct drm_connector *connector, bool force)
{
struct drm_device *dev = connector->dev;
struct udl_device *udl = to_udl(dev);
struct udl_connector *udl_connector = to_udl_connector(connector);
enum drm_connector_status status = connector_status_disconnected;
int idx;
/* cleanup previous EDID */
kfree(udl_connector->edid);
udl_connector->edid = NULL;
if (!drm_dev_enter(dev, &idx))
return connector_status_disconnected;
udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
if (udl_connector->edid)
status = connector_status_connected;
drm_dev_exit(idx);
return status;
}
static void udl_connector_destroy(struct drm_connector *connector)
{
struct udl_connector *udl_connector = to_udl_connector(connector);
drm_connector_cleanup(connector);
kfree(udl_connector->edid);
kfree(udl_connector);
}
static const struct drm_connector_funcs udl_connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.detect = udl_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = udl_connector_destroy,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
struct drm_connector *udl_connector_init(struct drm_device *dev)
{
struct udl_connector *udl_connector;
struct drm_connector *connector;
int ret;
udl_connector = kzalloc(sizeof(*udl_connector), GFP_KERNEL);
if (!udl_connector)
return ERR_PTR(-ENOMEM);
connector = &udl_connector->connector;
ret = drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_VGA);
if (ret)
goto err_kfree;
drm_connector_helper_add(connector, &udl_connector_helper_funcs);
connector->polled = DRM_CONNECTOR_POLL_HPD |
DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
return connector;
err_kfree:
kfree(udl_connector);
return ERR_PTR(ret);
}
/*
* Modesetting
*/
static enum drm_mode_status udl_mode_config_mode_valid(struct drm_device *dev,
const struct drm_display_mode *mode)
{
struct udl_device *udl = to_udl(dev);
if (udl->sku_pixel_limit) {
if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
return MODE_MEM;
}
return MODE_OK;
}
static const struct drm_mode_config_funcs udl_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.mode_valid = udl_mode_config_mode_valid,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
int udl_modeset_init(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
struct drm_plane *primary_plane;
struct drm_crtc *crtc;
struct drm_encoder *encoder;
struct drm_connector *connector;
int ret;
ret = drmm_mode_config_init(dev);
if (ret)
return ret;
dev->mode_config.min_width = 640;
dev->mode_config.min_height = 480;
dev->mode_config.max_width = 2048;
dev->mode_config.max_height = 2048;
dev->mode_config.preferred_depth = 16;
dev->mode_config.funcs = &udl_mode_config_funcs;
primary_plane = &udl->primary_plane;
ret = drm_universal_plane_init(dev, primary_plane, 0,
&udl_primary_plane_funcs,
udl_primary_plane_formats,
ARRAY_SIZE(udl_primary_plane_formats),
udl_primary_plane_fmtmods,
DRM_PLANE_TYPE_PRIMARY, NULL);
if (ret)
return ret;
drm_plane_helper_add(primary_plane, &udl_primary_plane_helper_funcs);
drm_plane_enable_fb_damage_clips(primary_plane);
crtc = &udl->crtc;
ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
&udl_crtc_funcs, NULL);
if (ret)
return ret;
drm_crtc_helper_add(crtc, &udl_crtc_helper_funcs);
encoder = &udl->encoder;
ret = drm_encoder_init(dev, encoder, &udl_encoder_funcs, DRM_MODE_ENCODER_DAC, NULL);
if (ret)
return ret;
encoder->possible_crtcs = drm_crtc_mask(crtc);
connector = udl_connector_init(dev);
if (IS_ERR(connector))
return PTR_ERR(connector);
ret = drm_connector_attach_encoder(connector, encoder);
if (ret)
return ret;
drm_mode_config_reset(dev);
return 0;
}
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