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drm/amdgpu: keep vga memory on MacBooks with switchable graphics

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On Intel MacBookPros with switchable graphics, when the iGPU
is enabled, the address of VRAM gets put at 0 in the dGPU's
virtual address space.  This is non-standard and seems to cause
issues with the cursor if it ends up at 0.  We have the framework
to reserve memory at 0 in the address space, so enable it here if
the vram start address is 0.

Reviewed-and-tested-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4302
Cc: stable@vger.kernel.org
Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2026-02-16 10:02:32 -05:00
parent 23c098b5fc
commit 096bb75e13
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
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@@ -1068,6 +1068,16 @@ void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev)
case CHIP_RENOIR:
adev->mman.keep_stolen_vga_memory = true;
break;
case CHIP_POLARIS10:
case CHIP_POLARIS11:
case CHIP_POLARIS12:
/* MacBookPros with switchable graphics put VRAM at 0 when
* the iGPU is enabled which results in cursor issues if
* the cursor ends up at 0. Reserve vram at 0 in that case.
*/
if (adev->gmc.vram_start == 0)
adev->mman.keep_stolen_vga_memory = true;
break;
default:
adev->mman.keep_stolen_vga_memory = false;
break;