drm/amd/display: check dpcd read status of DP_DOWNSTREAM_PORT_0

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[Why]
For special DP convert VGA dongle, core_link_read_dpcd for
DP_DOWNSTREAM_PORT_0 always return fail, then dongle_type will be set to
DISPLAY_DONGLE_NONE, which will cause desktop resolution abnormal.

[How]
If dpcd for DP_DOWNSTREAM_PORT_0 read fail, skip set dongle_type =
DISPLAY_DONGLE_NONE.

Signed-off-by: jinlong zhang <jinlong.zhang@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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jinlong zhang 2020-06-17 23:20:56 +08:00 • committed by Alex Deucher

parent 2705297c1a

commit 5aedc7bc40

1 changed files with 53 additions and 52 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

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