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Subject[PATCH 3.2 39/79] drm/radeon: Fix sideport problems on certain RS690 boards
3.2.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@amd.com>

commit 8333f0fe133be420ce3fcddfd568c3a559ab274e upstream.

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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/gpu/drm/radeon/rs690.c | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/drivers/gpu/drm/radeon/rs690.c
+++ b/drivers/gpu/drm/radeon/rs690.c
@@ -160,6 +160,16 @@ void rs690_mc_init(struct radeon_device
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;
+ }
rs690_pm_info(rdev);
radeon_vram_location(rdev, &rdev->mc, base);
rdev->mc.gtt_base_align = rdev->mc.gtt_size - 1;


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