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ati-vga: Add limited support for big endian frame buffer aperture

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Set frame buffer endianness according to requested endianness for
frame buffer apertures. We set frame buffer to big endian if any of
the two apertures are set to big endian. Using different endianness
for the two apertures is not implemented. This fixes inverted colors
with MacOS and Xorg frame buffer driver but some Linux drivers may
have endianness issues even on real hardware so this may not fix all
cases. MorphOS uses aper0 in LE, Linux uses aper0 in BE and MacOS uses
aper1 in BE but not sure about others or if MacOS also may need aper0
in which case we'll need a more complex fix but MacOS has other
problems yet so for now this might work.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: e2a7ec7af3fc30523213bcd27832ccad34323f2c.1565558093.git.balaton@eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2019-08-11 23:14:53 +02:00 • committed by Gerd Hoffmann
parent c026350a84
commit 8bb9a2b26d
3 changed files with 12 additions and 1 deletions
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2
hw/display/ati_regs.h
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@ -317,6 +317,8 @@
#define X_MPLL_REF_DIV_MASK 0x000000FF
/* Config control values (CONFIG_CNTL) */
#define APER_0_ENDIAN 0x00000003
#define APER_1_ENDIAN 0x0000000c
#define CFG_VGA_IO_DIS 0x00000400
/* CRTC control values (CRTC_GEN_CNTL) */