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drm/amd/display: Skip DPIA-specific DP LL automation flag for non-DPIA links

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[Why]
The is_automated flag logic only applies to USB4 DPIA links during DP LL
compliance test automation. The flag should not be set for non-DPIA
cases.

[How]
Add check for DPIA link endpoint type before setting the flag. Also,
rename is_automated to skip_fallback_on_link_loss for clarity.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@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:
George Shen 2023-12-01 06:25:09 -07:00 committed by Alex Deucher
parent 2cbed167d2
commit d24e50e100
3 changed files with 13 additions and 5 deletions
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8
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -1541,7 +1541,13 @@ struct dc_link {
bool is_dig_mapping_flexible;
bool hpd_status; /* HPD status of link without physical HPD pin. */
bool is_hpd_pending; /* Indicates a new received hpd */
bool is_automated; /* Indicates automated testing */
/* USB4 DPIA links skip verifying link cap, instead performing the fallback method
* for every link training. This is incompatible with DP LL compliance automation,
* which expects the same link settings to be used every retry on a link loss.
* This flag is used to skip the fallback when link loss occurs during automation.
*/
bool skip_fallback_on_link_loss;
bool edp_sink_present;

6
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c
View File

@ -265,7 +265,7 @@ void dp_handle_link_loss(struct dc_link *link)
for (i = count - 1; i >= 0; i--) {
// Always use max settings here for DP 1.4a LL Compliance CTS
if (link->is_automated) {
if (link->skip_fallback_on_link_loss) {
pipes[i]->link_config.dp_link_settings.lane_count =
link->verified_link_cap.lane_count;
pipes[i]->link_config.dp_link_settings.link_rate =
@ -404,7 +404,9 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link,
if (hpd_irq_dpcd_data.bytes.device_service_irq.bits.AUTOMATED_TEST) {
// Workaround for DP 1.4a LL Compliance CTS as USB4 has to share encoders unlike DP and USBC
link->is_automated = true;
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
link->skip_fallback_on_link_loss = true;
device_service_clear.bits.AUTOMATED_TEST = 1;
core_link_write_dpcd(
link,

4
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_dpia.c
View File

@ -811,7 +811,7 @@ static enum link_training_result dpia_training_eq_transparent(
/* Take into consideration corner case for DP 1.4a LL Compliance CTS as USB4
* has to share encoders unlike DP and USBC
*/
if (dp_is_interlane_aligned(dpcd_lane_status_updated) || (link->is_automated && retries_eq)) {
if (dp_is_interlane_aligned(dpcd_lane_status_updated) || (link->skip_fallback_on_link_loss && retries_eq)) {
result = LINK_TRAINING_SUCCESS;
break;
}
@ -1037,7 +1037,7 @@ enum link_training_result dpia_perform_link_training(
*/
if (result == LINK_TRAINING_SUCCESS) {
fsleep(5000);
if (!link->is_automated)
if (!link->skip_fallback_on_link_loss)
result = dp_check_link_loss_status(link, &lt_settings);
} else if (result == LINK_TRAINING_ABORT)
dpia_training_abort(link, &lt_settings, repeater_id);