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drm/amd/display: Enabling eDP no power sequencing with DAL feature mask

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[Why]
Sometimes, DP receiver chip power-controlled externally by an
Embedded Controller could be treated and used as eDP,
if it drives mobile display. In this case,
we shouldn't be doing power-sequencing, hence we can skip
waiting for T7-ready and T9-ready."

[How]
Added a feature mask to enable eDP no power sequencing feature.

To enable this, set 0x10 flag in amdgpu.dcfeaturemask on
Linux command line.

Signed-off-by: Zhan Liu <zhan.liu@amd.com>
Reviewed-by: Nikola Cornij <Nikola.Cornij@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Zhan Liu
2021-06-14 14:54:14 -04:00
committed by Alex Deucher
parent b322a50d17
commit a51482458d
5 changed files with 38 additions and 8 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -1160,6 +1160,9 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
if (amdgpu_dc_feature_mask & DC_DISABLE_FRACTIONAL_PWM_MASK)
init_data.flags.disable_fractional_pwm = true;
if (amdgpu_dc_feature_mask & DC_EDP_NO_POWER_SEQUENCING)
init_data.flags.edp_no_power_sequencing = true;
init_data.flags.power_down_display_on_boot = true;
INIT_LIST_HEAD(&adev->dm.da_list);