[PATCH 2/2] drm/amd/display: Add dcdebugmask option for disabling MPO

[sunpeng.li]

From: Leo Li <sunpeng...@amd.com>

[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...@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++++
 drivers/gpu/drm/amd/include/amd_shared.h          | 1 +
 2 files changed, 5 insertions(+)

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 d7208c0b76b1..4cf11bcc01a4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4194,6 +4194,10 @@ 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 1db21d13726d..f175e65b853a 100644
--- 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;
-- 
2.37.0