drm/amd/display: improve dpia pre-train

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[WHY]
We see unstable DP LL 4.2.1.3 test result with dpia pre-train. It is
because the outbox interrupt mechanism can not handle HPD
immediately and require some improvement.

[HOW]
1. not enable link if hpd_pending is true.
2. abort pre-train if training failed and hpd_pending is true.
3. check if 2 lane supported when it is alt mode

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Peichen Huang <PeiChen.Huang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Peichen Huang 2024-12-25 15:51:34 +08:00 • committed by Alex Deucher

parent ec6d8d49f4

commit 230dced3e2

3 changed files with 20 additions and 2 deletions

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5

drivers/gpu/drm/amd/display/dc/dio/dcn31/dcn31_dio_link_encoder.c

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9

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

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8

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

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