[PATCH] drm/amd/display: Set the domain as GTT when VRAM size <= 32 MB

[Rajib Mahapatra]

[Why]
In lower carve out (<= 32 MB) devices, it was unable to pin framebuffer in
VRAM domain for some BO allocations. The device shows below error logs and
sometimes it reboots too.

amdgpu 0000:02:00.0: amdgpu: 00000000d721431c pin failed
[drm:dm_plane_helper_prepare_fb] *ERROR* Failed to pin framebuffer with error 
-12

[How]
Place the domain as GTT when VRAM size <= 32 MB.

Signed-off-by: Rajib Mahapatra <rajib.mahapa...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h               |  1 +
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 +++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index dc3c6b3a00e5..d719be448eec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -236,6 +236,7 @@ extern int amdgpu_num_kcq;
 
 #define AMDGPU_VM_MAX_NUM_CTX                  4096
 #define AMDGPU_SG_THRESHOLD                    (256*1024*1024)
+#define AMDGPU_VRAM_MIN_THRESHOLD              (32*1024*1024)
 #define AMDGPU_DEFAULT_GTT_SIZE_MB             3072ULL /* 3GB by default */
 #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS         3000
 #define AMDGPU_MAX_USEC_TIMEOUT                        100000  /* 100 ms */
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 e1e57e7465a7..f71391599be1 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7106,8 +7106,16 @@ static int dm_plane_helper_prepare_fb(struct drm_plane 
*plane,
                return r;
        }
 
-       if (plane->type != DRM_PLANE_TYPE_CURSOR)
+       if (plane->type != DRM_PLANE_TYPE_CURSOR) {
                domain = amdgpu_display_supported_domains(adev, rbo->flags);
+               /*
+                * Handle devices with lower carve out.
+                */
+               if (adev->gmc.real_vram_size <= AMDGPU_VRAM_MIN_THRESHOLD) {
+                       domain |= (domain & AMDGPU_GEM_DOMAIN_GTT) ? domain :
+                                  AMDGPU_GEM_DOMAIN_GTT;
+               }
+       }
        else
                domain = AMDGPU_GEM_DOMAIN_VRAM;
 
-- 
2.25.1