ati-vga: Fixes to offset and pitch registers

Fix bit masks of registers for offset and pitch and also handle
default values for both R128P and RV100. This improves picture a bit
but does not resolve all problems yet so there might be some more bugs
somewhere.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 20190624100005.7A1CA746395@zero.eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
4 files changed