kernel.git/drivers/gpu/drm/msm/dp/dp_link.c, branch linux-rolling-stable

drm/msm/dp: Add support for lane mapping configuration

2025-11-14T14:59:27Z

QCS615 platform requires non-default logical-to-physical lane mapping due to its unique hardware routing. Unlike the standard mapping sequence <0 1 2 3>, QCS615 uses <3 2 0 1>, which necessitates explicit configuration via the data-lanes property in the device tree. This ensures correct signal routing between the DP controller and PHY. For partial definitions, fill remaining lanes with unused physical lanes in ascending order. Signed-off-by: Xiangxu Yin Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/675645/ Link: https://lore.kernel.org/r/20250919-add-displayport-support-for-qcs615-platform-v5-14-eae6681f4002@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: move link-specific parsing from dp_panel to dp_link

2025-11-14T14:59:27Z

Since max_dp_lanes and max_dp_link_rate are link-specific parameters, move their parsing from dp_panel to dp_link for better separation of concerns. Reviewed-by: Dmitry Baryshkov Signed-off-by: Xiangxu Yin Patchwork: https://patchwork.freedesktop.org/patch/675643/ Link: https://lore.kernel.org/r/20250919-add-displayport-support-for-qcs615-platform-v5-13-eae6681f4002@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: drop the msm_dp_catalog module

2025-07-04T13:35:19Z

Now as the msm_dp_catalog module became nearly empty, drop it, accessing registers directly from the corresponding submodules. Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd # sc7180-trogdor Signed-off-by: Dmitry Baryshkov Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/654332/ Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-11-2f0ec3ec000d@oss.qualcomm.com

drm/display: dp: change drm_dp_dpcd_read_link_status() return value

2025-03-25T14:20:38Z

drm_dp_dpcd_read_link_status() follows the "return error code or number of bytes read" protocol, with the code returning less bytes than requested in case of some errors. However most of the drivers interpreted that as "return error code in case of any error". Switch drm_dp_dpcd_read_link_status() to drm_dp_dpcd_read_data() and make it follow that protocol too. Acked-by: Jani Nikula Reviewed-by: Lyude Paul Signed-off-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20250324-drm-rework-dpcd-access-v4-2-e80ff89593df@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: prefix all symbols with msm_dp_

2024-10-31T19:08:01Z

For historical reasons a lot of symbols in the MSM DisplayPort driver used the generic dp_ prefix. Perform a mass-rename of those symbols to use msm_dp prefix. Basically this is a result of the following script: sed drivers/gpu/drm/msm/dp/* -i -e 's/\/\1/g' Yes, this also results in renaming of several struct fields in addition to renaming the structs and functions, but I think the simple solution is better than the more complex one. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202410250305.UHKDhtxy-lkp@intel.com/ Reviewed-by: Abhinav Kumar Signed-off-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/622211/ Link: https://lore.kernel.org/r/20241029-msm-dp-rename-v2-1-13c5c03fad44@linaro.org

drm/msm/dp: Remove unused defines and members

2024-04-22T13:22:49Z

Throughout the Qualcomm Displayport driver a number of defines and struct members has become unused, but lingers in the code. Remove these. Reviewed-by: Dmitry Baryshkov Signed-off-by: Bjorn Andersson Patchwork: https://patchwork.freedesktop.org/patch/585345/ Link: https://lore.kernel.org/r/20240328-msm-dp-cleanup-v2-3-a5aed9798d32@quicinc.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: allow voltage swing / pre emphasis of 3

2024-04-08T15:56:35Z

Both dp_link_adjust_levels() and dp_ctrl_update_vx_px() limit swing and pre-emphasis to 2, while the real maximum value for the sum of the voltage swing and pre-emphasis is 3. Fix the DP code to remove this limitation. Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Dmitry Baryshkov Reviewed-by: Kuogee Hsieh Tested-by: Kuogee Hsieh Patchwork: https://patchwork.freedesktop.org/patch/577006/ Link: https://lore.kernel.org/r/20240203-dp-swing-3-v1-1-6545e1706196@linaro.org

drm/msm/dp: return correct Colorimetry for DP_TEST_DYNAMIC_RANGE_CEA case

2024-01-24T22:09:19Z

MSA MISC0 bit 1 to 7 contains Colorimetry Indicator Field. dp_link_get_colorimetry_config() returns wrong colorimetry value in the DP_TEST_DYNAMIC_RANGE_CEA case in the current implementation. Hence fix this problem by having dp_link_get_colorimetry_config() return defined CEA RGB colorimetry value in the case of DP_TEST_DYNAMIC_RANGE_CEA. Changes in V2: -- drop retrieving colorimetry from colorspace -- drop dr = link->dp_link.test_video.test_dyn_range assignment Changes in V3: -- move defined MISCr0a Colorimetry vale to dp_reg.h -- rewording commit title -- rewording commit text to more precise describe this patch Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Kuogee Hsieh Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/574888/ Link: https://lore.kernel.org/r/1705526010-597-1-git-send-email-quic_khsieh@quicinc.com Signed-off-by: Abhinav Kumar

drm/msms/dp: fixed link clock divider bits be over written in BPC unknown case

2024-01-24T22:06:24Z

Since the value of DP_TEST_BIT_DEPTH_8 is already left shifted, in the BPC unknown case, the additional shift causes spill over to the other bits of the [DP_CONFIGURATION_CTRL] register. Fix this by changing the return value of dp_link_get_test_bits_depth() in the BPC unknown case to (DP_TEST_BIT_DEPTH_8 >> DP_TEST_BIT_DEPTH_SHIFT). Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Kuogee Hsieh Reviewed-by: Abhinav Kumar Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/573989/ Link: https://lore.kernel.org/r/1704917931-30133-1-git-send-email-quic_khsieh@quicinc.com [quic_abhinavk@quicinc.com: fix minor checkpatch warning to align with opening braces] Signed-off-by: Abhinav Kumar

drm/msm/dp: Inline dp_link_parse_sink_count()

2023-10-09T09:17:46Z

The function dp_link_parse_sink_count() is really just drm_dp_read_sink_count(). It debug prints out the bit for content protection (DP_SINK_CP_READY), but that is not useful beyond debug because 'link->dp_link.sink_count' is overwritten to only contain the sink_count in this same function. Just use drm_dp_read_sink_count() in the one place this function is called to simplify. Cc: Vinod Polimera Cc: Kuogee Hsieh Signed-off-by: Stephen Boyd Tested-by: Kuogee Hsieh Reviewed-by: Kuogee Hsieh Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/554987/ Link: https://lore.kernel.org/r/20230829184735.2841739-7-swboyd@chromium.org Signed-off-by: Dmitry Baryshkov