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drm/amd/display: improve dpia pre-train

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[WHY]
We see unstable DP LL 4.2.1.3 test result with dpia pre-train. It is
because the outbox interrupt mechanism can not handle HPD
immediately and require some improvement.

[HOW]
1. not enable link if hpd_pending is true.
2. abort pre-train if training failed and hpd_pending is true.
3. check if 2 lane supported when it is alt mode

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Peichen Huang <PeiChen.Huang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Peichen Huang
2024-12-25 15:51:34 +08:00
committed by Alex Deucher
parent ec6d8d49f4
commit 230dced3e2
3 changed files with 20 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
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@@ -2312,6 +2312,14 @@ bool dp_verify_link_cap_with_retries(
} else {
link->verified_link_cap = last_verified_link_cap;
}
/* For Dp tunneling link, a pending HPD means that we have a race condition between processing
* current link and processing the pending HPD. Since the training is failed, we should just brak
* the loop so that we have chance to process the pending HPD.
*/
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && link->is_hpd_pending)
break;
fsleep(10 * 1000);
}