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VIA PIPC: Poll legacy audio only if enabled, improves performance on 686A/B machines

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This commit is contained in:
RichardG867
2023-02-11 14:34:35 -03:00
parent 14eda6bd75
commit 3f62a95ca1
1 changed files with 20 additions and 4 deletions
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24
src/chipset/via_pipc.c
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@@ -851,9 +851,28 @@ pipc_sb_handlers(pipc_t *dev, uint8_t modem)
if (dev->ac97_regs[0][0x42] & 0x04) {
io_sethandler(0x388, 4, pipc_fm_read, NULL, NULL, pipc_fm_write, NULL, NULL, dev);
#ifndef VIA_PIPC_FM_EMULATION
dev->sb->opl_enabled = 1;
} else {
dev->sb->opl_enabled = 0;
#endif
}
}
static void
pipc_sb_get_buffer(int32_t *buffer, int len, void *priv)
{
pipc_t *dev = (pipc_t *) priv;
/* Poll SB audio only if the legacy block is enabled. */
#ifdef VIA_PIPC_FM_EMULATION
if (dev->ac97_regs[0][0x42] & 0x01)
#else
if (dev->ac97_regs[0][0x42] & 0x05)
#endif
sb_get_buffer_sbpro(buffer, len, dev->sb);
}
static uint8_t
pipc_read(int func, int addr, void *priv)
{
@@ -1599,10 +1618,7 @@ pipc_init(const device_t *info)
ac97_via_set_slot(dev->ac97, dev->slot, PCI_INTC);
dev->sb = device_add_inst(&sb_pro_compat_device, 2);
#ifndef VIA_PIPC_FM_EMULATION
dev->sb->opl_enabled = 1;
#endif
sound_add_handler(sb_get_buffer_sbpro, dev->sb);
sound_add_handler(pipc_sb_get_buffer, dev);
dev->gameport = gameport_add(&gameport_sio_device);