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drm/amdgpu: fixup bad vram size on gmc v8

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[ Upstream commit 11544d77e3 ]

Some boards(like RX550) seem to have garbage in the upper
16 bits of the vram size register.  Check for
this and clamp the size properly.  Fixes
boards reporting bogus amounts of vram.

after add this patch,the maximum GPU VRAM size is 64GB,
otherwise only 64GB vram size will be used.

Signed-off-by: Zongmin Zhou<zhouzongmin@kylinos.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zongmin Zhou 2021-12-15 17:23:37 +08:00 committed by Greg Kroah-Hartman
parent ee88ff140d
commit 516e332d6f
1 changed files with 10 additions and 3 deletions
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13
drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
View file

@ -524,10 +524,10 @@ static void gmc_v8_0_mc_program(struct amdgpu_device *adev)
static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
{
int r;
u32 tmp;
adev->gmc.vram_width = amdgpu_atombios_get_vram_width(adev);
if (!adev->gmc.vram_width) {
u32 tmp;
int chansize, numchan;
/* Get VRAM informations */
@ -571,8 +571,15 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
adev->gmc.vram_width = numchan * chansize;
}
/* size in MB on si */
adev->gmc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
adev->gmc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
tmp = RREG32(mmCONFIG_MEMSIZE);
/* some boards may have garbage in the upper 16 bits */
if (tmp & 0xffff0000) {
DRM_INFO("Probable bad vram size: 0x%08x\n", tmp);
if (tmp & 0xffff)
tmp &= 0xffff;
}
adev->gmc.mc_vram_size = tmp * 1024ULL * 1024ULL;
adev->gmc.real_vram_size = adev->gmc.mc_vram_size;
if (!(adev->flags & AMD_IS_APU)) {
r = amdgpu_device_resize_fb_bar(adev);