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drm/amd/display: Fix ASSR regression on embedded panels 

[Why]
Regression found in some embedded panels traces back to the earliest
upstreamed ASSR patch. The changed code flow are causing problems
with some panels.

[How]
- Change ASSR enabling code while preserving original code flow
  as much as possible
- Simplify the code on guarding with internal display flag

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=213779
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1620
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Stylon Wang 2021-07-21 12:25:24 +08:00 committed by Alex Deucher
parent 27f5355f5d
commit 6be50f5d83
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -1820,8 +1820,7 @@ bool perform_link_training_with_retries(
*/
panel_mode = DP_PANEL_MODE_DEFAULT;
}
} else
panel_mode = DP_PANEL_MODE_DEFAULT;
}
}
#endif
@ -4650,7 +4649,10 @@ enum dp_panel_mode dp_get_panel_mode(struct dc_link *link)
}
}
if (link->dpcd_caps.panel_mode_edp) {
if (link->dpcd_caps.panel_mode_edp &&
(link->connector_signal == SIGNAL_TYPE_EDP ||
(link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
link->is_internal_display))) {
return DP_PANEL_MODE_EDP;
}