drm/amdgpu: Avoid fetching vram vendor information

For GFX 9.4.3 APUs, the current method of fetching vram vendor
information is not reliable. Avoid fetching the information.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.7.x

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index f9039d64ff2d72804556daa16b8ed9632b08b307..17b7a25121b00e48637fffff324531890301819a 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1950,7 +1950,8 @@ static void gmc_v9_4_3_init_vram_info(struct amdgpu_device *adev)
        static const u32 regBIF_BIOS_SCRATCH_4 = 0x50;
        u32 vram_info;
 
-       if (!amdgpu_sriov_vf(adev)) {
+       /* Only for dGPU, vendor informaton is reliable */
+       if (!amdgpu_sriov_vf(adev) && !(adev->flags & AMD_IS_APU)) {
                vram_info = RREG32(regBIF_BIOS_SCRATCH_4);
                adev->gmc.vram_vendor = vram_info & 0xF;
        }