drm/amd/display: Add dcdebugmask option for disabling MPO

[Why & How]

It's useful to disable MPO when debugging or testing. Therefore, add a
dcdebugmask option to disable MPO.

Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-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 22a3f89..8660d93 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4197,6 +4197,10 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
        for (i = 0; i < dm->dc->caps.max_planes; ++i) {
                struct dc_plane_cap *plane = &dm->dc->caps.planes[i];
 
+               /* Do not create overlay if MPO disabled */
+               if (amdgpu_dc_debug_mask & DC_DISABLE_MPO)
+                       break;
+
                if (plane->type != DC_PLANE_TYPE_DCN_UNIVERSAL)
                        continue;
 

diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index 1db21d1..f175e65 100644 (file)
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -249,6 +249,7 @@ enum DC_DEBUG_MASK {
        DC_DISABLE_CLOCK_GATING = 0x8,
        DC_DISABLE_PSR = 0x10,
        DC_FORCE_SUBVP_MCLK_SWITCH = 0x20,
+       DC_DISABLE_MPO = 0x40,
 };
 
 enum amd_dpm_forced_level;