| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 041/129] drm/radeon: Fix sideport problems on certain RS690 boards | Date | Mon, 6 Jan 2014 14:37:50 -0800 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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 @@ -162,6 +162,16 @@ static void rs690_mc_init(struct radeon_ 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;
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