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Implemented correct Voodoo pixel clock calculation.

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This commit is contained in:
TomW 2015-08-08 20:57:17 +01:00
commit 44f80b879e
1 changed files with 62 additions and 5 deletions
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67
src/vid_voodoo.c
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@ -144,8 +144,12 @@ typedef struct voodoo_t
int pci_enable;
uint8_t dac_data[8];
int dac_reg;
int dac_reg, dac_reg_ff;
uint8_t dac_readdata;
uint16_t dac_pll_regs[16];
float pixel_clock;
int line_time;
voodoo_params_t params;
@ -3484,6 +3488,30 @@ static void voodoo_writew(uint32_t addr, uint16_t val, void *p)
queue_command(voodoo, addr | FIFO_WRITEW_FB, val);
}
static void voodoo_pixelclock_update(voodoo_t *voodoo)
{
int m = (voodoo->dac_pll_regs[0] & 0x7f) + 2;
int n1 = ((voodoo->dac_pll_regs[0] >> 8) & 0x1f) + 2;
int n2 = ((voodoo->dac_pll_regs[0] >> 13) & 0x07);
float t = (14318184.0 * ((float)m / (float)n1)) / (float)(1 << n2);
double clock_const;
int line_length;
if ((voodoo->dac_data[6] & 0xf0) == 0x20 ||
(voodoo->dac_data[6] & 0xf0) == 0x60 ||
(voodoo->dac_data[6] & 0xf0) == 0x70)
t /= 2.0f;
line_length = (voodoo->hSync & 0xff) + ((voodoo->hSync >> 16) & 0x3ff);
// pclog("Pixel clock %f MHz hsync %08x line_length %d\n", t, voodoo->hSync, line_length);
voodoo->pixel_clock = t;
clock_const = cpuclock / t;
voodoo->line_time = (int)((double)line_length * clock_const * (double)(1 << TIMER_SHIFT));
}
static void voodoo_writel(uint32_t addr, uint32_t val, void *p)
{
voodoo_t *voodoo = (voodoo_t *)p;
@ -3570,6 +3598,7 @@ static void voodoo_writel(uint32_t addr, uint32_t val, void *p)
case SST_hSync:
voodoo->hSync = val;
voodoo_pixelclock_update(voodoo);
break;
case SST_vSync:
voodoo->vSync = val;
@ -3602,7 +3631,26 @@ static void voodoo_writel(uint32_t addr, uint32_t val, void *p)
voodoo->dac_readdata = voodoo->dac_data[voodoo->dac_readdata];
}
else
voodoo->dac_data[voodoo->dac_reg] = val & 0xff;
{
if (voodoo->dac_reg == 5)
{
if (!voodoo->dac_reg_ff)
voodoo->dac_pll_regs[voodoo->dac_data[4] & 0xf] = (voodoo->dac_pll_regs[voodoo->dac_data[4] & 0xf] & 0xff00) | val;
else
voodoo->dac_pll_regs[voodoo->dac_data[4] & 0xf] = (voodoo->dac_pll_regs[voodoo->dac_data[4] & 0xf] & 0xff) | (val << 8);
// pclog("Write PLL reg %x %04x\n", voodoo->dac_data[4] & 0xf, voodoo->dac_pll_regs[voodoo->dac_data[4] & 0xf]);
voodoo->dac_reg_ff = !voodoo->dac_reg_ff;
if (!voodoo->dac_reg_ff)
voodoo->dac_data[4]++;
}
else
{
voodoo->dac_data[voodoo->dac_reg] = val & 0xff;
voodoo->dac_reg_ff = 0;
}
voodoo_pixelclock_update(voodoo);
}
break;
default:
@ -3935,8 +3983,10 @@ void voodoo_callback(void *p)
if (voodoo->line >= voodoo->v_total)
voodoo->line = 0;
voodoo->timer_count += TIMER_USEC * 32;
if (voodoo->line_time)
voodoo->timer_count += voodoo->line_time;
else
voodoo->timer_count += TIMER_USEC * 32;
}
static void voodoo_add_status_info(char *s, int max_len, void *p)
@ -3959,6 +4009,13 @@ static void voodoo_add_status_info(char *s, int max_len, void *p)
voodoo_time = 0;
}
static void voodoo_speed_changed(void *p)
{
voodoo_t *voodoo = (voodoo_t *)p;
voodoo_pixelclock_update(voodoo);
}
void *voodoo_init()
{
int c;
@ -4120,7 +4177,7 @@ device_t voodoo_device =
voodoo_init,
voodoo_close,
NULL,
NULL,
voodoo_speed_changed,
NULL,
voodoo_add_status_info,
voodoo_config