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drm/amd/display: Fix deadlock during gpu reset v3

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[Why]
during idle optimizations we acquire the dc_lock, this lock is also
acquired during gpu_reset so we end up hanging the system due to a
deadlock

[How]
If we are in gpu reset:
 - disable idle optimizations and skip calls to the dc function

v2: skip idle optimizations calls
v3: add guard for DCN

Fixes: 71338cb4a7 ("drm/amd/display: enable idle optimizations for linux (MALL stutter)")
Signed-off-by: Bhawanpreet Lakha <[email protected]>
Reviewed-by: Nicholas Kazlauskas <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
This commit is contained in:
Bhawanpreet Lakha authored and Alex Deucher committed 2021-01-13 23:48:47 -05:00
1 parent 966737906c
commit 98ab5f3513
1 file changed
+10
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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+10
View File
@@ -1816,6 +1816,11 @@ static int dm_suspend(void *handle)
if (amdgpu_in_reset(adev)) {
mutex_lock(&dm->dc_lock);
#if defined(CONFIG_DRM_AMD_DC_DCN)
dc_allow_idle_optimizations(adev->dm.dc, false);
#endif
dm->cached_dc_state = dc_copy_state(dm->dc->current_state);
dm_gpureset_toggle_interrupts(adev, dm->cached_dc_state, false);
@@ -5483,6 +5488,10 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
if (!dc_interrupt_set(adev->dm.dc, irq_source, enable))
return -EBUSY;
#if defined(CONFIG_DRM_AMD_DC_DCN)
if (amdgpu_in_reset(adev))
return 0;
mutex_lock(&dm->dc_lock);
if (enable)
@@ -5499,6 +5508,7 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
mutex_unlock(&dm->dc_lock);
#endif
return 0;
}