[PATCH] drm/amdgpu: extend MacBook VRAM-at-0 workaround to VERDE

[Ayhan Çiçek]

The existing MacBook workaround reserves VRAM at address 0 for
Polaris ASICs when the iGPU is enabled. This prevents cursor
allocations from landing at address 0.

A MacBookPro11,5 with Radeon R9 M370X (VERDE) hits the same
failure mode. Hardware cursor updates repeatedly log
"DC: Cursor address is 0!" followed by
"DC failed to set cursor attributes".

Extend the existing workaround to CHIP_VERDE. With this change,
hardware cursor operation is stable, the cursor errors remain at
zero during repeated cursor movement, and cursor disappearance
and flicker are no longer observed.

Signed-off-by: Ayhan Çiçek <ayhancicek@xxxxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 1bf2a42fa..9e7f9cc2b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -1086,6 +1086,7 @@ void amdgpu_gmc_init_vga_resv_regions(struct amdgpu_device *adev)
 	case CHIP_RENOIR:
 		adev->mman.keep_stolen_vga_memory = true;
 		break;
+	case CHIP_VERDE:
 	case CHIP_POLARIS10:
 	case CHIP_POLARIS11:
 	case CHIP_POLARIS12:
-- 
2.55.0