drm/nv50: calculate vram reordering block size
Will be used at a later point when we plug in an alternative VRAM memory manager for GeForce 8+ boards. Based on pscnv code to do the same. Signed-off-by: NBen Skeggs <bskeggs@redhat.com> Signed-off-by: NMarcin Kościelnicki <koriakin@0x04.net> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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