[PATCH] drm/amdgpu: Avoid fetching VRAM vendor info

[Zhang, Hawking]

[AMD Official Use Only - General]

Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>

Regards,
Hawking
-----Original Message-----
From: Lazar, Lijo <Lijo.Lazar at amd.com>
Sent: Friday, February 2, 2024 23:36
To: amd-gfx at lists.freedesktop.org
Cc: Zhang, Hawking <Hawking.Zhang at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Kamal, Asad <Asad.Kamal at amd.com>; Ma, Le <Le.Ma at amd.com>
Subject: [PATCH] drm/amdgpu: Avoid fetching VRAM vendor info

The present way to fetch VRAM vendor information turns out to be not reliable on GFX 9.4.3 dGPUs as well. Avoid using the data.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index a3a11538207b..c1161f465b37 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1949,14 +1949,6 @@ static int gmc_v9_0_init_mem_ranges(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;
-
-       /* 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;
-       }
        adev->gmc.vram_type = AMDGPU_VRAM_TYPE_HBM;
        adev->gmc.vram_width = 128 * 64;
 }
--
2.25.1