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drm/amd/display: Add link enc null ptr check for cable ID (#2597)

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[Why]
Certain configurations will result in link encoder
to not be assigned to the link at the time we apply
cable ID logic. We should skip it in those cases.

[How]
Check if link_enc is not null before applying
cable ID.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Shen, George 2022-01-28 22:03:55 +08:00 committed by Alex Deucher
parent 274b924c3e
commit 241a074fc1
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -6327,7 +6327,12 @@ void dpcd_set_source_specific_data(struct dc_link *link)
void dpcd_update_cable_id(struct dc_link *link)
{
if (!link->link_enc->features.flags.bits.IS_UHBR10_CAPABLE ||
struct link_encoder *link_enc = NULL;
link_enc = link_enc_cfg_get_link_enc(link);
if (!link_enc ||
!link_enc->features.flags.bits.IS_UHBR10_CAPABLE ||
link->dprx_status.cable_id_updated)
return;