On Wed, Sep 10, 2025 at 4:34 AM Lijo Lazar <lijo.la...@amd.com> wrote:
>
> Read VRAM vendor information from scratch register for GC v9.4.3 and
> GC v9.5.0 SOCs.
>
> Signed-off-by: Lijo Lazar <lijo.la...@amd.com>
Acked-by: Alex Deucher <alexander.deuc...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 8404695eb13f..0d1dd587db5f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -1834,11 +1834,19 @@ static void gmc_v9_0_save_registers(struct
> amdgpu_device *adev)
>
> static void gmc_v9_4_3_init_vram_info(struct amdgpu_device *adev)
> {
> + static const u32 regBIF_BIOS_SCRATCH_4 = 0x50;
> + u32 vram_info;
> +
> adev->gmc.vram_type = AMDGPU_VRAM_TYPE_HBM;
> adev->gmc.vram_width = 128 * 64;
>
> if (amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(9, 5, 0))
> adev->gmc.vram_type = AMDGPU_VRAM_TYPE_HBM3E;
> +
> + if (!(adev->flags & AMD_IS_APU) && !amdgpu_sriov_vf(adev)) {
> + vram_info = RREG32(regBIF_BIOS_SCRATCH_4);
> + adev->gmc.vram_vendor = vram_info & 0xF;
> + }
> }
>
> static int gmc_v9_0_sw_init(struct amdgpu_ip_block *ip_block)
> --
> 2.49.0
>
