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drm/hisilicon/hibmc: fix dp probabilistical detect errors after HPD irq

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[ Upstream commit 3906e7a3b2 ]

The issue is that drm_connector_helper_detect_from_ddc() returns wrong
status when plugging or unplugging the monitor, which may cause the link
failed err.[0] Use HPD pin status in DP's detect_ctx() for real physical
monitor in/out, and implement a complete DP detection including read DPCD,
check if it's a branch device and its sink count for different situations.

[0]:
	hibme-drm 0000:83:00.0: [drm] *ERROR* channel equalization failed 5 times
	hibme-drm 0000:83:00.0: [drm] *ERROR* channel equalization failed 5 times
	hibme-drm 0000:83:00.0: [drm] *ERROR* dp link training failed, ret: -16
	hibmc-drm 0000:83:00.0: [drm] *ERROR* hibme dp mode set failed: -16

Fixes: 3c7623fb5b ("drm/hisilicon/hibmc: Enable this hot plug detect of irq feature")
Signed-off-by: Baihan Li <libaihan@huawei.com>
Signed-off-by: Yongbang Shi <shiyongbang@huawei.com>
Reviewed-by: Tao Tian <tiantao6@hisilicon.com>
Link: https://patch.msgid.link/20251210023759.3944834-2-shiyongbang@huawei.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Baihan Li 2025-12-10 10:37:56 +08:00 • committed by Greg Kroah-Hartman
commit bc950899ef
5 changed files with 80 additions and 4 deletions
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