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

drm/msm/dp: fix all kernel-doc warnings

2025-12-24T09:24:18Z

Correct and add kernel-doc comments to eliminate all warnings: Warning: ../drivers/gpu/drm/msm/dp/dp_debug.h:31 expecting prototype for msm_dp_debug_get(). Prototype was for msm_dp_debug_init() instead Warning: ../drivers/gpu/drm/msm/dp/dp_drm.c:24 function parameter 'connector' not described in 'msm_dp_bridge_detect' Warning: ../drivers/gpu/drm/msm/dp/dp_link.h:90 expecting prototype for mdss_dp_test_bit_depth_to_bpp(). Prototype was for msm_dp_link_bit_depth_to_bpp() instead Warning: ../drivers/gpu/drm/msm/dp/dp_link.h:126 function parameter 'aux' not described in 'msm_dp_link_get' Warning: ../drivers/gpu/drm/msm/dp/dp_link.h:126 function parameter 'dev' not described in 'msm_dp_link_get' Warning: ../drivers/gpu/drm/msm/dp/dp_panel.h:70 function parameter 'bw_code' not described in 'is_link_rate_valid' Warning: ../drivers/gpu/drm/msm/dp/dp_panel.h:84 expecting prototype for msm_dp_link_is_lane_count_valid(). Prototype was for is_lane_count_valid() instead Signed-off-by: Randy Dunlap Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/695647/ Link: https://lore.kernel.org/r/20251219184638.1813181-3-rdunlap@infradead.org Signed-off-by: Dmitry Baryshkov

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: Prepare for link training per-segment for LTTPRs

2025-05-12T16:18:49Z

Per-segment link training requires knowing the number of LTTPRs (if any) present. Store the count during LTTPRs' initialization. Fixes: 72d0af4accd9 ("drm/msm/dp: Add support for LTTPR handling") Reviewed-by: Abel Vesa Reviewed-by: Abhinav Kumar Reviewed-by: Dmitry Baryshkov Signed-off-by: Aleksandrs Vinarskis Tested-by: Jessica Zhang # SA8775P Tested-by: Johan Hovold Tested-by: Rob Clark Patchwork: https://patchwork.freedesktop.org/patch/652306/ Link: https://lore.kernel.org/r/20250507230113.14270-4-alex.vinarskis@gmail.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: Account for LTTPRs capabilities

2025-05-12T16:18:49Z

Take into account LTTPR capabilities when selecting maximum allowed link rate, number of data lines. Fixes: 72d0af4accd9 ("drm/msm/dp: Add support for LTTPR handling") Reviewed-by: Abel Vesa Reviewed-by: Abhinav Kumar Reviewed-by: Dmitry Baryshkov Signed-off-by: Aleksandrs Vinarskis Tested-by: Jessica Zhang # SA8775P Tested-by: Johan Hovold Tested-by: Rob Clark Patchwork: https://patchwork.freedesktop.org/patch/652302/ Link: https://lore.kernel.org/r/20250507230113.14270-3-alex.vinarskis@gmail.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: remove mdss_dp_test_bit_depth_to_bpc()

2024-02-11T20:38:06Z

mdss_dp_test_bit_depth_to_bpc() can be replace by mdss_dp_test_bit_depth_to_bpp() / 3. Hence remove it. Signed-off-by: Kuogee Hsieh Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/574279/ Link: https://lore.kernel.org/r/1704993255-12753-1-git-send-email-quic_khsieh@quicinc.com Signed-off-by: Dmitry Baryshkov

drm/msm/dp: DisplayPort PHY compliance tests fixup

2020-11-04T16:26:25Z

Bandwidth code was being used as test link rate. Fix this by converting bandwidth code to test link rate Do not reset voltage and pre-emphasis level during IRQ HPD attention interrupt. Also fix pre-emphasis parsing during test link status process Signed-off-by: Tanmay Shah Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets") Reviewed-by: Stephen Boyd Signed-off-by: Rob Clark