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authorTakashi Iwai <tiwai@suse.de>2008-04-23 17:47:28 +0200
committerTakashi Iwai <tiwai@suse.de>2008-04-24 12:38:25 +0200
commit3a841d519f91463361bbbe7addc24a0c1b2e9f99 (patch)
treec2044e30d0898659898be8b1e011337d2b623035 /sound/pci
parentb415ed45f4db9f8365daac84cf2518642a174dc0 (diff)
downloadlinux-3a841d519f91463361bbbe7addc24a0c1b2e9f99.tar.gz
[ALSA] ice1724 - Fix IRQ lock-up with MPU access
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>
Diffstat (limited to 'sound/pci')
-rw-r--r--sound/pci/ice1712/ice1724.c95
-rw-r--r--sound/pci/ice1712/prodigy192.c4
2 files changed, 81 insertions, 18 deletions
diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
index 13ea94f317c..4490422fb93 100644
--- a/sound/pci/ice1712/ice1724.c
+++ b/sound/pci/ice1712/ice1724.c
@@ -223,6 +223,32 @@ static unsigned int snd_vt1724_get_gpio_data(struct snd_ice1712 *ice)
}
/*
+ * 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;
-
+#ifdef CONFIG_SND_DEBUG
+ if (++timeout > 10) {
+ printk(KERN_ERR
+ "ice1724: Too long irq loop, status = 0x%x\n",
+ status);
+ break;
+ }
+#endif
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 (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);
+ 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;
+ mask = VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX;
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
}
}
diff --git a/sound/pci/ice1712/prodigy192.c b/sound/pci/ice1712/prodigy192.c
index 25ceb67a9c1..48d3679292a 100644
--- a/sound/pci/ice1712/prodigy192.c
+++ b/sound/pci/ice1712/prodigy192.c
@@ -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 */
};