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

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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>
This commit is contained in:
Dave Airlie 2009-07-21 20:39:30 +10:00
commit 7a50f01a4a
12 changed files with 56 additions and 42 deletions
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5
drivers/gpu/drm/radeon/radeon.h
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@ -332,8 +332,11 @@ struct radeon_mc {
unsigned gtt_location;
unsigned gtt_size;
unsigned vram_location;
unsigned vram_size;
/* for some chips with <= 32MB we need to lie
* about vram size near mc fb location */
unsigned mc_vram_size;
unsigned vram_width;
unsigned real_vram_size;
int vram_mtrr;
bool vram_is_ddr;
};