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drm/radeon: fixup bad vram size on SI 

Some boards 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.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-12-03 09:24:30 -05:00
parent b7bc799903
commit 0ca223b029
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/radeon/si.c
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@ -3882,8 +3882,15 @@ static int si_mc_init(struct radeon_device *rdev)
rdev->mc.aper_base = pci_resource_start(rdev->pdev, 0);
rdev->mc.aper_size = pci_resource_len(rdev->pdev, 0);
/* size in MB on si */
rdev->mc.mc_vram_size = RREG32(CONFIG_MEMSIZE) * 1024ULL * 1024ULL;
rdev->mc.real_vram_size = RREG32(CONFIG_MEMSIZE) * 1024ULL * 1024ULL;
tmp = RREG32(CONFIG_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;
}
rdev->mc.mc_vram_size = tmp * 1024ULL * 1024ULL;
rdev->mc.real_vram_size = rdev->mc.mc_vram_size;
rdev->mc.visible_vram_size = rdev->mc.aper_size;
si_vram_gtt_location(rdev, &rdev->mc);
radeon_update_bandwidth_info(rdev);