drm/amd/display: Explicitly disable triplebuffer flips

[Why]
This is enabled by default on Renoir but there's userspace/API support
to actually make use of this.

Since we're not passing this down through surface updates, let's
explicitly disable this for now.

This fixes "dcn20_program_front_end_for_ctx" warnings associated with
incorrect/unexpected programming sequences performed while this is
enabled.

[How]
Disable it at the topmost level in DM in case anyone tries to flip this
to enabled for any of the other ASICs like Navi10/14.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8142e83486641b103320e980ee9d49398cbcf231..53ac6138ea9499ff1b11526c14257e8132b5d6c4 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3022,6 +3022,9 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
        if (adev->asic_type != CHIP_CARRIZO && adev->asic_type != CHIP_STONEY)
                dm->dc->debug.disable_stutter = amdgpu_pp_feature_mask & PP_STUTTER_MODE ? false : true;
 
+       /* No userspace support. */
+       dm->dc->debug.disable_tri_buf = true;
+
        return 0;
 fail:
        kfree(aencoder);