[Bug 42920] Radeon with KMS and UMA works only up to 128MB

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42920


Alex Deucher <alexdeucher at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |alexdeucher at gmail.com




--- Comment #1 from Alex Deucher <alexdeucher at gmail.com>  2012-03-13 13:34:13 ---
Looks like the bios sets up the vram size wrong for values > 128 MB.  Can you
print the value of the CONFIG_MEMSIZE register (0x5428) when you select various
vram sizes over 128 MB?  You can either use radeonreg
(http://cgit.freedesktop.org/~airlied/radeontool/):

radeonreg regmatch 0x5428

or the following patch:

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 426cc65..6f02970 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1204,6 +1204,7 @@ int r600_mc_init(struct radeon_device *rdev)
        /* Setup GPU memory space */
        rdev->mc.mc_vram_size = RREG32(CONFIG_MEMSIZE);
        rdev->mc.real_vram_size = RREG32(CONFIG_MEMSIZE);
+       DRM_INFO("CONFIG_MEMSIZE: 0x%08x\n", RREG32(CONFIG_MEMSIZE));
        rdev->mc.visible_vram_size = rdev->mc.aper_size;
        r600_vram_gtt_location(rdev, &rdev->mc);

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