ati-vga: Implement DDC and EDID info from monitor
This adds DDC support to ati-vga and connects i2c-ddc to it. This
allows at least MacOS with an ATI ndrv, Linux radeonfb and MorphOS to
get monitor EDID info (although MorphOS splash screen is not displayed
and radeonfb needs additional tables from vgabios-rv100). Xorg needs
additional support from VESA vgabios, it's missing INT10 0x4F15
function (see
https://gitlab.freedesktop.org/xorg/xserver/blob/master/hw/xfree86/vbe/vbe.c)
without which no DDC is available that also prevents loading the
accelerated X driver.
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 046ddebb7ec8db48c4e877ee444ec1c41e385a74.1561028123.git.balaton@eik.bme.hu
ati-vga: Clarify comment
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 20190620195213.C54127461AE@zero.eik.bme.hu
ati-vga: Add DDC reg names for debug
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 20190621181459.2F8207462AA@zero.eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/hw/display/ati_regs.h b/hw/display/ati_regs.h
index 923bfd3..1ec3498 100644
--- a/hw/display/ati_regs.h
+++ b/hw/display/ati_regs.h
@@ -37,6 +37,8 @@
#define CRTC_GEN_CNTL 0x0050
#define CRTC_EXT_CNTL 0x0054
#define DAC_CNTL 0x0058
+#define GPIO_VGA_DDC 0x0060
+#define GPIO_DVI_DDC 0x0064
#define GPIO_MONID 0x0068
#define I2C_CNTL_1 0x0094
#define PALETTE_INDEX 0x00b0
