[PATCH] drm/amd: Add debug mask for subviewport mclk switch

[Aurabindo Pillai]

[Why&How]
Expose a new debugfs enum to force a subviewport memory clock switch
to facilitate easy testing.

Signed-off-by: Aurabindo Pillai <aurabindo.pil...@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +++
 drivers/gpu/drm/amd/include/amd_shared.h          | 1 +
 2 files changed, 4 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 c9145864ed2b..7a034ca95be2 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1559,6 +1559,9 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
        if (amdgpu_dc_debug_mask & DC_DISABLE_CLOCK_GATING)
                adev->dm.dc->debug.disable_clock_gate = true;
 
+       if (amdgpu_dc_debug_mask & DC_FORCE_SUBVP_MCLK_SWITCH)
+               adev->dm.dc->debug.force_subvp_mclk_switch = true;
+
        r = dm_dmub_hw_init(adev);
        if (r) {
                DRM_ERROR("DMUB interface failed to initialize: status=%d\n", 
r);
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h 
b/drivers/gpu/drm/amd/include/amd_shared.h
index bcdf7453a403..b1c55dd7b498 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -247,6 +247,7 @@ enum DC_DEBUG_MASK {
        DC_DISABLE_DSC = 0x4,
        DC_DISABLE_CLOCK_GATING = 0x8,
        DC_DISABLE_PSR = 0x10,
+       DC_FORCE_SUBVP_MCLK_SWITCH = 0x20,
 };
 
 enum amd_dpm_forced_level;
-- 
2.36.1