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drm/amd/display: fix bug with check for HPD Low in verify link cap

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[Why]
There is a bug when determining if link training should be retried when
HPD is low in dp_verify_link_cap_with_retries.

[How]
Correctly, fail dp_verify_link_cap_with_retries without retry when
HPD is low.

Signed-off-by: Sivapiriyan Kumarasamy <sivapiriyan.kumarasamy@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Abdoulaye Berthe <Abdoulaye.Berthe@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sivapiriyan Kumarasamy 2019-09-12 15:55:44 -04:00 committed by Alex Deucher
parent 15caeabc57
commit 82db2e3c39
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -1656,11 +1656,14 @@ bool dp_verify_link_cap_with_retries(
for (i = 0; i < attempts; i++) {
int fail_count = 0;
enum dc_connection_type type;
enum dc_connection_type type = dc_connection_none;
memset(&link->verified_link_cap, 0,
sizeof(struct dc_link_settings));
if (!dc_link_detect_sink(link, &type)) {
if (!dc_link_detect_sink(link, &type) || type == dc_connection_none) {
link->verified_link_cap.lane_count = LANE_COUNT_ONE;
link->verified_link_cap.link_rate = LINK_RATE_LOW;
link->verified_link_cap.link_spread = LINK_SPREAD_DISABLED;
break;
} else if (dp_verify_link_cap(link,
&link->reported_link_cap,