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drm/amd/display: Add retires when read DPCD

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[why & how]
Sometimes read DPCD return fail while result not retrieved yet. Add
retries mechanism in Replay handle hpd irq to get real result.

Reviewed-by: Jerry Zuo <jerry.zuo@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Joan Lee <joan.lee@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Joan Lee 2024-05-15 10:23:01 +08:00 committed by Alex Deucher
parent cc4d6ea0f2
commit 2770b91588
1 changed files with 20 additions and 6 deletions
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26
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
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@ -189,16 +189,30 @@ static void handle_hpd_irq_replay_sink(struct dc_link *link)
union dpcd_replay_configuration replay_configuration = {0};
/*AMD Replay version reuse DP_PSR_ERROR_STATUS for REPLAY_ERROR status.*/
union psr_error_status replay_error_status = {0};
bool ret = false;
int retries = 0;
if (!link->replay_settings.replay_feature_enabled)
return;
dm_helpers_dp_read_dpcd(
link->ctx,
link,
DP_SINK_PR_REPLAY_STATUS,
&replay_configuration.raw,
sizeof(replay_configuration.raw));
while (retries < 10) {
ret = dm_helpers_dp_read_dpcd(
link->ctx,
link,
DP_SINK_PR_REPLAY_STATUS,
&replay_configuration.raw,
sizeof(replay_configuration.raw));
if (ret)
break;
retries++;
}
if (!ret)
DC_LOG_WARNING("[%s][%d] DPCD read addr.0x%x failed with %d retries\n",
__func__, __LINE__,
DP_SINK_PR_REPLAY_STATUS, retries);
dm_helpers_dp_read_dpcd(
link->ctx,