drm/amdgpu: fix doorbell regression

This patch adds a missed handling of PL domain doorbell while
handling VRAM faults.

Cc: Christian Koenig <[email protected]>
Cc: Alex Deucher <[email protected]>
Fixes: a6ff969 ("drm/amdgpu: fix visible VRAM handling during faults")
Reviewed-by: Christian Koenig <[email protected]>
Signed-off-by: Shashank Sharma <[email protected]>
Signed-off-by: Arvind Yadav <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: contactshashanksharma

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -419,7 +419,7 @@ bool amdgpu_res_cpu_visible(struct amdgpu_device *adev,
 		return false;
 
 	if (res->mem_type == TTM_PL_SYSTEM || res->mem_type == TTM_PL_TT ||
-	    res->mem_type == AMDGPU_PL_PREEMPT)
+	    res->mem_type == AMDGPU_PL_PREEMPT || res->mem_type == AMDGPU_PL_DOORBELL)
 		return true;
 
 	if (res->mem_type != TTM_PL_VRAM)