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drm/radeon/kms: fix r300 vram width calculations 

This was incorrect according to the docs and the UMS driver does
it like this.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2010-02-05 13:57:03 +10:00
parent a17538f93c
commit 5ff5571767
1 changed files with 7 additions and 4 deletions
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11
drivers/gpu/drm/radeon/r300.c
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@ -506,11 +506,14 @@ void r300_vram_info(struct radeon_device *rdev)
/* DDR for all card after R300 & IGP */
rdev->mc.vram_is_ddr = true;
tmp = RREG32(RADEON_MEM_CNTL);
if (tmp & R300_MEM_NUM_CHANNELS_MASK) {
rdev->mc.vram_width = 128;
} else {
rdev->mc.vram_width = 64;
tmp &= R300_MEM_NUM_CHANNELS_MASK;
switch (tmp) {
case 0: rdev->mc.vram_width = 64; break;
case 1: rdev->mc.vram_width = 128; break;
case 2: rdev->mc.vram_width = 256; break;
default: rdev->mc.vram_width = 128; break;
}
r100_vram_init_sizes(rdev);