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drm/amd/display: delay 100ms before restart after failing to read CP_IRQ

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[why]
Some DPRX will issue CP_IRQ when user disconnects a display
that has been authenticated.
Since display is being disconnecting dpcd read will fail.
This will cause us to attempt HDCP retry on disconnection.
We are adding a 100ms delay before retry.
So we will only start retry if within 100ms there is no disconnection call
to HDCP module.

Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wenjing Liu 2021-05-17 15:54:19 -04:00 committed by Alex Deucher
parent f56c837afc
commit 416b4e7596
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_transition.c
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@ -564,7 +564,7 @@ enum mod_hdcp_status mod_hdcp_hdcp2_dp_transition(struct mod_hdcp *hdcp,
case D2_A5_AUTHENTICATED:
if (input->rxstatus_read == FAIL ||
input->reauth_request_check == FAIL) {
fail_and_restart_in_ms(0, &status, output);
fail_and_restart_in_ms(100, &status, output);
break;
} else if (input->link_integrity_check_dp == FAIL) {
if (hdcp->connection.hdcp2_retry_count >= 1)