drm/amd/display: Add version check before using DP alt query interface

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[Why]
To maintain compatibility with firmware older than 4.0.11.

Those firmware may have interrmittent hangs with RDCSPIPE or the PHY,
but we shouldn't regress their previous behavior.

[How]
Use the new path if firmware is development or 4.0.11 or newer. Use the
legacy path otherwise.

Fixes: 41f91315b5 ("drm/amd/display: Query DMCUB for dp alt status")

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Nicholas Kazlauskas 2021-12-16 11:19:30 -05:00 • committed by Alex Deucher

parent 214993e106

commit 19e43f1276

1 changed files with 94 additions and 20 deletions

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114

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

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