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drm/msm/disp: Correct porch timing for SDM845

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[ Upstream commit 146e87f3e11de0dfa091ff87e34b4bc6eec761a4 ]

Type-C DisplayPort inoperable due to incorrect porch settings.
- Re-used wide_bus_en as flag to prevent porch shifting

Fixes: c943b4948b ("drm/msm/dp: add displayPort driver support")
Signed-off-by: James A. MacInnes <james.a.macinnes@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/636945/
Link: https://lore.kernel.org/r/20250212-sdm845_dp-v2-2-4954e51458f4@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
James A. MacInnes
2025-02-12 15:03:47 -08:00
committed by Greg Kroah-Hartman
parent 7e6980c225
commit 77087a7977
1 changed files with 9 additions and 5 deletions
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14
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
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@@ -93,17 +93,21 @@ static void drm_mode_to_intf_timing_params(
timing->vsync_polarity = 0;
}
/* for DP/EDP, Shift timings to align it to bottom right */
if (phys_enc->hw_intf->cap->type == INTF_DP) {
timing->wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
timing->compression_en = dpu_encoder_is_dsc_enabled(phys_enc->parent);
/*
* For DP/EDP, Shift timings to align it to bottom right.
* wide_bus_en is set for everything excluding SDM845 &
* porch changes cause DisplayPort failure and HDMI tearing.
*/
if (phys_enc->hw_intf->cap->type == INTF_DP && timing->wide_bus_en) {
timing->h_back_porch += timing->h_front_porch;
timing->h_front_porch = 0;
timing->v_back_porch += timing->v_front_porch;
timing->v_front_porch = 0;
}
timing->wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
timing->compression_en = dpu_encoder_is_dsc_enabled(phys_enc->parent);
/*
* for DP, divide the horizonal parameters by 2 when
* widebus is enabled