drm/msm/dp: Read DPCD and sink count in bridge detect()

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Instead of relying on the link_ready flag to specify if DP is connected,
read the DPCD bits and get the sink count to accurately detect if DP is
connected.

Signed-off-by: Jessica Zhang <jessica.zhang@oss.qualcomm.com>
Tested-by: Val Packett <val@packett.cool> # x1e80100-dell-latitude-7455
Tested-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com> # Hamoa IOT EVK, QCS8300 Ride
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/727603/
Link: https://lore.kernel.org/r/20260524-hpd-refactor-v6-3-cf3ab488dd7b@oss.qualcomm.com

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Jessica Zhang 2026-05-24 13:33:31 +03:00 • committed by Dmitry Baryshkov

parent 3fbfdc3b1d

commit 0f2293dfb5

3 changed files with 65 additions and 20 deletions

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63

drivers/gpu/drm/msm/dp/dp_display.c

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20

drivers/gpu/drm/msm/dp/dp_drm.c

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2

drivers/gpu/drm/msm/dp/dp_drm.h

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