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Add DDC / plug and play monitor support for Mach64VT2.

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This commit is contained in:
SarahW 2020-10-17 20:10:23 +01:00
commit a19829cf11
2 changed files with 31 additions and 3 deletions
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31
src/vid_ati_mach64.c
View file

@ -8,6 +8,7 @@
#include "rom.h"
#include "thread.h"
#include "video.h"
#include "vid_ddc.h"
#include "vid_svga.h"
#include "vid_svga_render.h"
#include "vid_ati68860_ramdac.h"
@ -1838,11 +1839,27 @@ uint8_t mach64_ext_readb(uint32_t addr, void *p)
else
ret = ati68860_ramdac_in(addr & 3, &mach64->ramdac, &mach64->svga);
break;
case 0xc4: case 0xc5: case 0xc6: case 0xc7:
if (mach64->type == MACH64_VT2)
mach64->dac_cntl |= (4 << 24);
case 0xc4: case 0xc5: case 0xc6:
READ8(addr, mach64->dac_cntl);
break;
case 0xc7:
READ8(addr, mach64->dac_cntl);
if (mach64->type == MACH64_VT2)
{
uint8_t gpio_state = 6;
if ((ret & (1 << 4)) && !(ret & (1 << 1)))
gpio_state &= ~(1 << 1);
if (!(ret & (1 << 4)) && !ddc_read_data())
gpio_state &= ~(1 << 1);
if ((ret & (1 << 5)) && !(ret & (1 << 2)))
gpio_state &= ~(1 << 2);
if (!(ret & (1 << 5)) && !ddc_read_clock())
gpio_state &= ~(1 << 2);
ret = (ret & ~6) | gpio_state;
}
break;
case 0xd0: case 0xd1: case 0xd2: case 0xd3:
READ8(addr, mach64->gen_test_cntl);
@ -2354,6 +2371,12 @@ void mach64_ext_writeb(uint32_t addr, uint8_t val, void *p)
WRITE8(addr, mach64->dac_cntl, val);
svga_set_ramdac_type(svga, (mach64->dac_cntl & 0x100) ? RAMDAC_8BIT : RAMDAC_6BIT);
ati68860_set_ramdac_type(&mach64->ramdac, (mach64->dac_cntl & 0x100) ? RAMDAC_8BIT : RAMDAC_6BIT);
{
int data = (val & (1 << 4)) ? ((val & (1 << 1)) ? 1 : 0) : 1;
int clk = (val & (1 << 5)) ? ((val & (1 << 2)) ? 1 : 0) : 1;
ddc_i2c_change(clk, data);
}
break;
case 0xd0: case 0xd1: case 0xd2: case 0xd3:
@ -3398,6 +3421,8 @@ static void *mach64_common_init()
mach64->fifo_not_full_event = thread_create_event();
mach64->fifo_thread = thread_create(fifo_thread, mach64);
ddc_init();
return mach64;
}

3
src/vid_ddc.c
View file

@ -304,4 +304,7 @@ void ddc_init(void)
for (c = 0; c < 127; c++)
checksum += edid_data[c];
edid_data[127] = 256 - checksum;
i2c.clock = 1;
i2c.data = 1;
}