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authorChandan Uddaraju <chandanu@codeaurora.org>2020-08-28 00:16:55 +0300
committerRob Clark <robdclark@chromium.org>2020-09-15 20:54:34 +0300
commitc943b4948b5848fc0e07f875edbd35a973879e22 (patch)
treebd5c293057f2da48823bac8fb6466c120da5091f /drivers/gpu/drm/msm/dp/dp_panel.c
parentb22960b8f274382ff165db50faebbde5f8a16c32 (diff)
downloadlinux-c943b4948b5848fc0e07f875edbd35a973879e22.tar.xz
drm/msm/dp: add displayPort driver support
Add the needed displayPort files to enable DP driver on msm target. "dp_display" module is the main module that calls into other sub-modules. "dp_drm" file represents the interface between DRM framework and DP driver. Changes in v12: -- Add support of pm ops in display port driver -- Clear bpp depth bits before writing to MISC register -- Fix edid read Previous Change log: https://lkml.kernel.org/lkml/20200818051137.21478-3-tanmay@codeaurora.org/ Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org> Signed-off-by: Vara Reddy <varar@codeaurora.org> Signed-off-by: Tanmay Shah <tanmay@codeaurora.org> Co-developed-by: Abhinav Kumar <abhinavk@codeaurora.org> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org> Co-developed-by: Kuogee Hsieh <khsieh@codeaurora.org> Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> Co-developed-by: Guenter Roeck <groeck@chromium.org> Signed-off-by: Guenter Roeck <groeck@chromium.org> Co-developed-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Rob Clark <robdclark@chromium.org>
Diffstat (limited to 'drivers/gpu/drm/msm/dp/dp_panel.c')
-rw-r--r--drivers/gpu/drm/msm/dp/dp_panel.c486
1 files changed, 486 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
new file mode 100644
index 000000000000..5ac4b017da8f
--- /dev/null
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -0,0 +1,486 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
+ */
+
+#include "dp_panel.h"
+
+#include <drm/drm_connector.h>
+#include <drm/drm_edid.h>
+
+#define DP_MAX_DS_PORT_COUNT 1
+
+struct dp_panel_private {
+ struct device *dev;
+ struct dp_panel dp_panel;
+ struct drm_dp_aux *aux;
+ struct dp_link *link;
+ struct dp_catalog *catalog;
+ bool panel_on;
+ bool aux_cfg_update_done;
+};
+
+static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
+{
+ int rc = 0;
+ size_t rlen;
+ struct dp_panel_private *panel;
+ struct dp_link_info *link_info;
+ u8 *dpcd, major = 0, minor = 0, temp;
+ u32 dfp_count = 0, offset = DP_DPCD_REV;
+
+ dpcd = dp_panel->dpcd;
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+ link_info = &dp_panel->link_info;
+
+ rlen = drm_dp_dpcd_read(panel->aux,
+ DP_TRAINING_AUX_RD_INTERVAL, &temp, 1);
+ if (rlen < 0) {
+ DRM_ERROR("err reading DP_TRAINING_AUX_RD_INTERVAL,rlen=%zd\n",
+ rlen);
+ rc = -EINVAL;
+ goto end;
+ }
+
+ /* check for EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT */
+ if (temp & BIT(7)) {
+ DRM_DEBUG_DP("using EXTENDED_RECEIVER_CAPABILITY_FIELD\n");
+ offset = DPRX_EXTENDED_DPCD_FIELD;
+ }
+
+ rlen = drm_dp_dpcd_read(panel->aux, offset,
+ dpcd, (DP_RECEIVER_CAP_SIZE + 1));
+ if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
+ DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
+ if (rlen == -ETIMEDOUT)
+ rc = rlen;
+ else
+ rc = -EINVAL;
+
+ goto end;
+ }
+
+ print_hex_dump(KERN_DEBUG, "[drm-dp] SINK DPCD: ",
+ DUMP_PREFIX_NONE, 8, 1, dp_panel->dpcd, rlen, false);
+
+ link_info->revision = dpcd[DP_DPCD_REV];
+ major = (link_info->revision >> 4) & 0x0f;
+ minor = link_info->revision & 0x0f;
+
+ link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
+ link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
+
+ if (link_info->num_lanes > dp_panel->max_dp_lanes)
+ link_info->num_lanes = dp_panel->max_dp_lanes;
+
+ /* Limit support upto HBR2 until HBR3 support is added */
+ if (link_info->rate >= (drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4)))
+ link_info->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
+
+ DRM_DEBUG_DP("version: %d.%d\n", major, minor);
+ DRM_DEBUG_DP("link_rate=%d\n", link_info->rate);
+ DRM_DEBUG_DP("lane_count=%d\n", link_info->num_lanes);
+
+ if (drm_dp_enhanced_frame_cap(dpcd))
+ link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
+
+ dfp_count = dpcd[DP_DOWN_STREAM_PORT_COUNT] &
+ DP_DOWN_STREAM_PORT_COUNT;
+
+ if (dfp_count > DP_MAX_DS_PORT_COUNT) {
+ DRM_ERROR("DS port count %d greater that max (%d) supported\n",
+ dfp_count, DP_MAX_DS_PORT_COUNT);
+ return -EINVAL;
+ }
+end:
+ return rc;
+}
+
+static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
+ u32 mode_edid_bpp, u32 mode_pclk_khz)
+{
+ struct dp_link_info *link_info;
+ const u32 max_supported_bpp = 30, min_supported_bpp = 18;
+ u32 bpp = 0, data_rate_khz = 0;
+
+ bpp = min_t(u32, mode_edid_bpp, max_supported_bpp);
+
+ link_info = &dp_panel->link_info;
+ data_rate_khz = link_info->num_lanes * link_info->rate * 8;
+
+ while (bpp > min_supported_bpp) {
+ if (mode_pclk_khz * bpp <= data_rate_khz)
+ break;
+ bpp -= 6;
+ }
+
+ return bpp;
+}
+
+static void dp_panel_set_test_mode(struct dp_panel_private *panel,
+ struct dp_display_mode *mode)
+{
+ struct drm_display_mode *drm_mode = NULL;
+ struct dp_link_test_video *test_info = NULL;
+
+ drm_mode = &mode->drm_mode;
+ test_info = &panel->link->test_video;
+
+ drm_mode->hdisplay = test_info->test_h_width;
+ drm_mode->hsync_start = drm_mode->hdisplay + test_info->test_h_total -
+ (test_info->test_h_start + test_info->test_h_width);
+ drm_mode->hsync_end = drm_mode->hsync_start +
+ test_info->test_hsync_width;
+ drm_mode->htotal = drm_mode->hsync_end + test_info->test_h_start -
+ test_info->test_hsync_width;
+
+ drm_mode->vdisplay = test_info->test_v_height;
+ drm_mode->vsync_start = drm_mode->vdisplay + test_info->test_v_total -
+ (test_info->test_v_start + test_info->test_v_height);
+ drm_mode->vsync_end = drm_mode->vsync_start +
+ test_info->test_vsync_width;
+ drm_mode->vtotal = drm_mode->vsync_end + test_info->test_v_start -
+ test_info->test_vsync_width;
+
+ drm_mode->clock = test_info->test_h_total *
+ test_info->test_v_total * test_info->test_rr_n;
+
+ drm_mode->type = 0x48;
+ drm_mode_set_name(drm_mode);
+
+ if (test_info->test_rr_d == 0)
+ drm_mode->clock /= 1000;
+ else
+ drm_mode->clock /= 1001;
+
+ if (test_info->test_h_width == 640)
+ drm_mode->clock = 25170;
+}
+
+static int dp_panel_update_modes(struct drm_connector *connector,
+ struct edid *edid)
+{
+ int rc = 0;
+
+ if (edid) {
+ rc = drm_connector_update_edid_property(connector, edid);
+ if (rc) {
+ DRM_ERROR("failed to update edid property %d\n", rc);
+ return rc;
+ }
+ rc = drm_add_edid_modes(connector, edid);
+ DRM_DEBUG_DP("%s -", __func__);
+ return rc;
+ }
+
+ rc = drm_connector_update_edid_property(connector, NULL);
+ if (rc)
+ DRM_ERROR("failed to update edid property %d\n", rc);
+
+ return rc;
+}
+
+int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
+ struct drm_connector *connector)
+{
+ int rc = 0, bw_code;
+ struct dp_panel_private *panel;
+
+ if (!dp_panel || !connector) {
+ DRM_ERROR("invalid input\n");
+ return -EINVAL;
+ }
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+ rc = dp_panel_read_dpcd(dp_panel);
+ bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
+ if (rc || !is_link_rate_valid(bw_code) ||
+ !is_lane_count_valid(dp_panel->link_info.num_lanes) ||
+ (bw_code > dp_panel->max_bw_code)) {
+ DRM_ERROR("read dpcd failed %d\n", rc);
+ return rc;
+ }
+ rc = drm_dp_read_desc(panel->aux, &dp_panel->desc,
+ drm_dp_is_branch(dp_panel->dpcd));
+ if (rc) {
+ DRM_ERROR("read sink/branch descriptor failed %d\n", rc);
+ return rc;
+ }
+
+ kfree(dp_panel->edid);
+ dp_panel->edid = NULL;
+
+ dp_panel->edid = drm_get_edid(connector,
+ &panel->aux->ddc);
+ if (!dp_panel->edid) {
+ DRM_ERROR("panel edid read failed\n");
+ return -EINVAL;
+ }
+
+ if (panel->aux_cfg_update_done) {
+ DRM_DEBUG_DP("read DPCD with updated AUX config\n");
+ rc = dp_panel_read_dpcd(dp_panel);
+ bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
+ if (rc || !is_link_rate_valid(bw_code) ||
+ !is_lane_count_valid(dp_panel->link_info.num_lanes)
+ || (bw_code > dp_panel->max_bw_code)) {
+ DRM_ERROR("read dpcd failed %d\n", rc);
+ return rc;
+ }
+ panel->aux_cfg_update_done = false;
+ }
+
+ return 0;
+}
+
+u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel,
+ u32 mode_edid_bpp, u32 mode_pclk_khz)
+{
+ struct dp_panel_private *panel;
+ u32 bpp = mode_edid_bpp;
+
+ if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) {
+ DRM_ERROR("invalid input\n");
+ return 0;
+ }
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+ if (dp_panel->video_test)
+ bpp = dp_link_bit_depth_to_bpp(
+ panel->link->test_video.test_bit_depth);
+ else
+ bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp,
+ mode_pclk_khz);
+
+ return bpp;
+}
+
+int dp_panel_get_modes(struct dp_panel *dp_panel,
+ struct drm_connector *connector, struct dp_display_mode *mode)
+{
+ struct dp_panel_private *panel;
+
+ if (!dp_panel) {
+ DRM_ERROR("invalid input\n");
+ return -EINVAL;
+ }
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+ if (dp_panel->video_test) {
+ dp_panel_set_test_mode(panel, mode);
+ return 1;
+ } else if (dp_panel->edid) {
+ return dp_panel_update_modes(connector, dp_panel->edid);
+ }
+
+ return 0;
+}
+
+static u8 dp_panel_get_edid_checksum(struct edid *edid)
+{
+ struct edid *last_block;
+ u8 *raw_edid;
+ bool is_edid_corrupt;
+
+ if (!edid) {
+ DRM_ERROR("invalid edid input\n");
+ return 0;
+ }
+
+ raw_edid = (u8 *)edid;
+ raw_edid += (edid->extensions * EDID_LENGTH);
+ last_block = (struct edid *)raw_edid;
+
+ /* block type extension */
+ drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt);
+ if (!is_edid_corrupt)
+ return last_block->checksum;
+
+ DRM_ERROR("Invalid block, no checksum\n");
+ return 0;
+}
+
+void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
+{
+ struct dp_panel_private *panel;
+
+ if (!dp_panel) {
+ DRM_ERROR("invalid input\n");
+ return;
+ }
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+ if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
+ u8 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
+
+ dp_link_send_edid_checksum(panel->link, checksum);
+ dp_link_send_test_response(panel->link);
+ }
+}
+
+void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
+{
+ struct dp_catalog *catalog;
+ struct dp_panel_private *panel;
+
+ if (!dp_panel) {
+ DRM_ERROR("invalid input\n");
+ return;
+ }
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+ catalog = panel->catalog;
+
+ if (!panel->panel_on) {
+ DRM_DEBUG_DP("DP panel not enabled, handle TPG on next on\n");
+ return;
+ }
+
+ if (!enable) {
+ dp_catalog_panel_tpg_disable(catalog);
+ return;
+ }
+
+ DRM_DEBUG_DP("%s: calling catalog tpg_enable\n", __func__);
+ dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
+}
+
+void dp_panel_dump_regs(struct dp_panel *dp_panel)
+{
+ struct dp_catalog *catalog;
+ struct dp_panel_private *panel;
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+ catalog = panel->catalog;
+
+ dp_catalog_dump_regs(catalog);
+}
+
+int dp_panel_timing_cfg(struct dp_panel *dp_panel)
+{
+ int rc = 0;
+ u32 data, total_ver, total_hor;
+ struct dp_catalog *catalog;
+ struct dp_panel_private *panel;
+ struct drm_display_mode *drm_mode;
+
+ panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+ catalog = panel->catalog;
+ drm_mode = &panel->dp_panel.dp_mode.drm_mode;
+
+ DRM_DEBUG_DP("width=%d hporch= %d %d %d\n",
+ drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end,
+ drm_mode->hsync_start - drm_mode->hdisplay,
+ drm_mode->hsync_end - drm_mode->hsync_start);
+
+ DRM_DEBUG_DP("height=%d vporch= %d %d %d\n",
+ drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end,
+ drm_mode->vsync_start - drm_mode->vdisplay,
+ drm_mode->vsync_end - drm_mode->vsync_start);
+
+ total_hor = drm_mode->htotal;
+
+ total_ver = drm_mode->vtotal;
+
+ data = total_ver;
+ data <<= 16;
+ data |= total_hor;
+
+ catalog->total = data;
+
+ data = (drm_mode->vtotal - drm_mode->vsync_start);
+ data <<= 16;
+ data |= (drm_mode->htotal - drm_mode->hsync_start);
+
+ catalog->sync_start = data;
+
+ data = drm_mode->vsync_end - drm_mode->vsync_start;
+ data <<= 16;
+ data |= (panel->dp_panel.dp_mode.v_active_low << 31);
+ data |= drm_mode->hsync_end - drm_mode->hsync_start;
+ data |= (panel->dp_panel.dp_mode.h_active_low << 15);
+
+ catalog->width_blanking = data;
+
+ data = drm_mode->vdisplay;
+ data <<= 16;
+ data |= drm_mode->hdisplay;
+
+ catalog->dp_active = data;
+
+ dp_catalog_panel_timing_cfg(catalog);
+ panel->panel_on = true;
+
+ return rc;
+}
+
+int dp_panel_init_panel_info(struct dp_panel *dp_panel)
+{
+ int rc = 0;
+ struct drm_display_mode *drm_mode;
+
+ drm_mode = &dp_panel->dp_mode.drm_mode;
+
+ /*
+ * print resolution info as this is a result
+ * of user initiated action of cable connection
+ */
+ DRM_DEBUG_DP("SET NEW RESOLUTION:\n");
+ DRM_DEBUG_DP("%dx%d@%dfps\n", drm_mode->hdisplay,
+ drm_mode->vdisplay, drm_mode_vrefresh(drm_mode));
+ DRM_DEBUG_DP("h_porches(back|front|width) = (%d|%d|%d)\n",
+ drm_mode->htotal - drm_mode->hsync_end,
+ drm_mode->hsync_start - drm_mode->hdisplay,
+ drm_mode->hsync_end - drm_mode->hsync_start);
+ DRM_DEBUG_DP("v_porches(back|front|width) = (%d|%d|%d)\n",
+ drm_mode->vtotal - drm_mode->vsync_end,
+ drm_mode->vsync_start - drm_mode->vdisplay,
+ drm_mode->vsync_end - drm_mode->vsync_start);
+ DRM_DEBUG_DP("pixel clock (KHz)=(%d)\n", drm_mode->clock);
+ DRM_DEBUG_DP("bpp = %d\n", dp_panel->dp_mode.bpp);
+
+ dp_panel->dp_mode.bpp = max_t(u32, 18,
+ min_t(u32, dp_panel->dp_mode.bpp, 30));
+ DRM_DEBUG_DP("updated bpp = %d\n", dp_panel->dp_mode.bpp);
+
+ return rc;
+}
+
+struct dp_panel *dp_panel_get(struct dp_panel_in *in)
+{
+ struct dp_panel_private *panel;
+ struct dp_panel *dp_panel;
+
+ if (!in->dev || !in->catalog || !in->aux || !in->link) {
+ DRM_ERROR("invalid input\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
+ if (!panel)
+ return ERR_PTR(-ENOMEM);
+
+ panel->dev = in->dev;
+ panel->aux = in->aux;
+ panel->catalog = in->catalog;
+ panel->link = in->link;
+
+ dp_panel = &panel->dp_panel;
+ dp_panel->max_bw_code = DP_LINK_BW_8_1;
+ panel->aux_cfg_update_done = false;
+
+ return dp_panel;
+}
+
+void dp_panel_put(struct dp_panel *dp_panel)
+{
+ if (!dp_panel)
+ return;
+
+ kfree(dp_panel->edid);
+}