drm/amd/display: Add polling method to handle MST reply packet

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[Why]
Specific TBT4 dock doesn't send out short HPD to notify source
that IRQ event DOWN_REP_MSG_RDY is set. Which violates the spec
and cause source can't send out streams to mst sinks.

[How]
To cover this misbehavior, add an additional polling method to detect
DOWN_REP_MSG_RDY is set. HPD driven handling method is still kept.
Just hook up our handler to drm mgr->cbs->poll_hpd_irq().

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jerry Zuo <jerry.zuo@amd.com>
Acked-by: Alan Liu <haoping.liu@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wayne Lin 2022-03-09 17:05:05 +08:00 • committed by Alex Deucher

parent c4e532f753

commit bb4fa525f3

4 changed files with 159 additions and 86 deletions

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117

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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7

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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110

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

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11

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h

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