drm/radeon/kms: vram sizing on certain r100 chips needs workaround.

If an rn50/r100/m6/m7 GPU has < 64MB RAM, i.e. 8/16/32, the
aperture used to calculate the MC_FB_LOCATION needs to be worked
out from the CONFIG_APER_SIZE register, and not the actual vram size.

TTM VRAM size was also being initialised wrong, use actual vram size
to initialise it.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index c45559fc97fd..538cd907df69 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -67,7 +67,7 @@ int r600_mc_init(struct radeon_device *rdev)
                        "programming pipes. Bad things might happen.\n");
         }
 
-        tmp = rdev->mc.vram_location + rdev->mc.vram_size - 1;
+        tmp = rdev->mc.vram_location + rdev->mc.mc_vram_size - 1;
         tmp = REG_SET(R600_MC_FB_TOP, tmp >> 24);
         tmp |= REG_SET(R600_MC_FB_BASE, rdev->mc.vram_location >> 24);
         WREG32(R600_MC_VM_FB_LOCATION, tmp);
@@ -140,7 +140,8 @@ void r600_vram_get_type(struct radeon_device *rdev)
 void r600_vram_info(struct radeon_device *rdev)
 {
         r600_vram_get_type(rdev);
-        rdev->mc.vram_size = RREG32(R600_CONFIG_MEMSIZE);
+        rdev->mc.real_vram_size = RREG32(R600_CONFIG_MEMSIZE);
+        rdev->mc.mc_vram_size = rdev->mc.real_vram_size;
 
         /* Could aper size report 0 ? */
         rdev->mc.aper_base = drm_get_resource_start(rdev->ddev, 0);