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drm/radeon: Fix sideport problems on certain RS690 boards

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Some RS690 boards with 64MB of sideport memory show up as
having 128MB sideport + 256MB of UMA.  In this case,
just skip the sideport memory and use UMA.  This fixes
rendering corruption and should improve performance.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=35457

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-12-02 18:15:51 -05:00
parent 5c015db7d9
commit 8333f0fe13
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/radeon/rs690.c
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@ -162,6 +162,16 @@ static void rs690_mc_init(struct radeon_device *rdev)
base = RREG32_MC(R_000100_MCCFG_FB_LOCATION);
base = G_000100_MC_FB_START(base) << 16;
rdev->mc.igp_sideport_enabled = radeon_atombios_sideport_present(rdev);
/* Some boards seem to be configured for 128MB of sideport memory,
* but really only have 64MB. Just skip the sideport and use
* UMA memory.
*/
if (rdev->mc.igp_sideport_enabled &&
(rdev->mc.real_vram_size == (384 * 1024 * 1024))) {
base += 128 * 1024 * 1024;
rdev->mc.real_vram_size -= 128 * 1024 * 1024;
rdev->mc.mc_vram_size = rdev->mc.real_vram_size;
}
/* Use K8 direct mapping for fast fb access. */
rdev->fastfb_working = false;