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VIA AC97: Correct DMA behavior when FLAG bit is set

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This commit is contained in:
RichardG867
2023-03-25 20:13:51 -03:00
parent d1606df682
commit b941a5b99c
1 changed files with 3 additions and 5 deletions
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8
src/sound/snd_ac97_via.c
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@@ -316,11 +316,9 @@ ac97_via_sgd_write(uint16_t addr, uint8_t val, void *priv)
dev->sgd_regs[addr & 0xf0] |= 0x08;
} else {
/* Start SGD immediately. */
dev->sgd_regs[addr & 0xf0] |= 0x80;
dev->sgd_regs[addr & 0xf0] &= ~0x44;
dev->sgd_regs[addr & 0xf0] = (dev->sgd_regs[addr & 0xf0] & ~0x47) | 0x80;
/* Start at the specified entry pointer. */
dev->sgd[addr >> 4].sample_ptr = 0;
dev->sgd[addr >> 4].entry_ptr = *((uint32_t *) &dev->sgd_regs[(addr & 0xf0) | 0x4]) & 0xfffffffe;
dev->sgd[addr >> 4].restart = 2;
@@ -531,7 +529,7 @@ ac97_via_sgd_process(void *priv)
timer_on_auto(&sgd->dma_timer, 10.0);
/* Process SGD if it's active, and the FIFO has room or is disabled. */
if (((sgd_status & 0x84) == 0x80) && (sgd->always_run || ((sgd->fifo_end - sgd->fifo_pos) <= (sizeof(sgd->fifo) - 4)))) {
if (((sgd_status & 0xc7) == 0x80) && (sgd->always_run || ((sgd->fifo_end - sgd->fifo_pos) <= (sizeof(sgd->fifo) - 4)))) {
/* Move on to the next block if no entry is present. */
if (sgd->restart) {
/* (Re)load entry pointer if required. */
@@ -586,7 +584,7 @@ ac97_via_sgd_process(void *priv)
if (sgd->entry_flags & 0x40) {
ac97_via_log(" with FLAG");
/* Raise FLAG. */
/* Raise FLAG to pause SGD. */
dev->sgd_regs[sgd->id] |= 0x01;
#ifdef ENABLE_AC97_VIA_LOG