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[ALSA] ice1724 - Fix IRQ lock-up with MPU access

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The sound boards with VT1724 and compatible chips may lock up when
MPU401 is accessed together with the PCM streaming.
This patch fixes the problem.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-04-23 17:47:28 +02:00
parent b415ed45f4
commit 3a841d519f
2 changed files with 83 additions and 20 deletions
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97
sound/pci/ice1712/ice1724.c
View File

@ -222,6 +222,32 @@ static unsigned int snd_vt1724_get_gpio_data(struct snd_ice1712 *ice)
return data;
}
/*
* MPU401 accessor
*/
static unsigned char snd_vt1724_mpu401_read(struct snd_mpu401 *mpu,
unsigned long addr)
{
/* fix status bits to the standard position */
/* only RX_EMPTY and TX_FULL are checked */
if (addr == MPU401C(mpu))
return (inb(addr) & 0x0c) << 4;
else
return inb(addr);
}
static void snd_vt1724_mpu401_write(struct snd_mpu401 *mpu,
unsigned char data, unsigned long addr)
{
if (addr == MPU401C(mpu)) {
if (data == MPU401_ENTER_UART)
outb(0x01, addr);
/* what else? */
} else
outb(data, addr);
}
/*
* Interrupt handler
*/
@ -230,24 +256,53 @@ static irqreturn_t snd_vt1724_interrupt(int irq, void *dev_id)
{
struct snd_ice1712 *ice = dev_id;
unsigned char status;
unsigned char status_mask =
VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX | VT1724_IRQ_MTPCM;
int handled = 0;
#ifdef CONFIG_SND_DEBUG
int timeout = 0;
#endif
while (1) {
status = inb(ICEREG1724(ice, IRQSTAT));
status &= status_mask;
if (status == 0)
break;
handled = 1;
/* these should probably be separated at some point,
* but as we don't currently have MPU support on the board
* I will leave it
*/
if ((status & VT1724_IRQ_MPU_RX)||(status & VT1724_IRQ_MPU_TX)) {
if (ice->rmidi[0])
snd_mpu401_uart_interrupt(irq, ice->rmidi[0]->private_data);
outb(status & (VT1724_IRQ_MPU_RX|VT1724_IRQ_MPU_TX), ICEREG1724(ice, IRQSTAT));
status &= ~(VT1724_IRQ_MPU_RX|VT1724_IRQ_MPU_TX);
#ifdef CONFIG_SND_DEBUG
if (++timeout > 10) {
printk(KERN_ERR
"ice1724: Too long irq loop, status = 0x%x\n",
status);
break;
}
#endif
handled = 1;
if (status & VT1724_IRQ_MPU_TX) {
if (ice->rmidi[0])
snd_mpu401_uart_interrupt_tx(irq,
ice->rmidi[0]->private_data);
else /* disable TX to be sure */
outb(inb(ICEREG1724(ice, IRQMASK)) |
VT1724_IRQ_MPU_TX,
ICEREG1724(ice, IRQMASK));
/* Due to mysterical reasons, MPU_TX is always
* generated (and can't be cleared) when a PCM
* playback is going. So let's ignore at the
* next loop.
*/
status_mask &= ~VT1724_IRQ_MPU_TX;
}
if (status & VT1724_IRQ_MPU_RX) {
if (ice->rmidi[0])
snd_mpu401_uart_interrupt(irq,
ice->rmidi[0]->private_data);
else /* disable RX to be sure */
outb(inb(ICEREG1724(ice, IRQMASK)) |
VT1724_IRQ_MPU_RX,
ICEREG1724(ice, IRQMASK));
}
/* ack MPU irq */
outb(status, ICEREG1724(ice, IRQSTAT));
if (status & VT1724_IRQ_MTPCM) {
/*
* Multi-track PCM
@ -2236,10 +2291,7 @@ static int __devinit snd_vt1724_create(struct snd_card *card,
}
/* unmask used interrupts */
if (! (ice->eeprom.data[ICE_EEP2_SYSCONF] & VT1724_CFG_MPU401))
mask = VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX;
else
mask = 0;
outb(mask, ICEREG1724(ice, IRQMASK));
/* don't handle FIFO overrun/underruns (just yet),
* since they cause machine lockups
@ -2373,14 +2425,29 @@ static int __devinit snd_vt1724_probe(struct pci_dev *pci,
if (! c->no_mpu401) {
if (ice->eeprom.data[ICE_EEP2_SYSCONF] & VT1724_CFG_MPU401) {
struct snd_mpu401 *mpu;
if ((err = snd_mpu401_uart_new(card, 0, MPU401_HW_ICE1712,
ICEREG1724(ice, MPU_CTRL),
MPU401_INFO_INTEGRATED,
(MPU401_INFO_INTEGRATED |
MPU401_INFO_TX_IRQ),
ice->irq, 0,
&ice->rmidi[0])) < 0) {
snd_card_free(card);
return err;
}
mpu = ice->rmidi[0]->private_data;
mpu->read = snd_vt1724_mpu401_read;
mpu->write = snd_vt1724_mpu401_write;
/* unmask MPU RX/TX irqs */
outb(inb(ICEREG1724(ice, IRQMASK)) &
~(VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX),
ICEREG1724(ice, IRQMASK));
#if 0 /* for testing */
/* set watermarks */
outb(VT1724_MPU_RX_FIFO | 0x1,
ICEREG1724(ice, MPU_FIFO_WM));
outb(0x1, ICEREG1724(ice, MPU_FIFO_WM));
#endif
}
}

4
sound/pci/ice1712/prodigy192.c
View File

@ -812,10 +812,6 @@ struct snd_ice1712_card_info snd_vt1724_prodigy192_cards[] __devinitdata = {
.build_controls = prodigy192_add_controls,
.eeprom_size = sizeof(prodigy71_eeprom),
.eeprom_data = prodigy71_eeprom,
/* the current MPU401 code loops infinitely
* when opening midi device
*/
.no_mpu401 = 1,
},
{ } /* terminator */
};