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[ALSA] oxygen: use AC97 interrupt
After an AC97 register read or write, use the AC97 interrupt instead of polling to wait for the access to be completed. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
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@ -3,6 +3,7 @@
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include "oxygen_regs.h"
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@ -65,6 +66,7 @@ struct oxygen {
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struct snd_pcm_substream *streams[PCM_COUNT];
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struct snd_kcontrol *controls[CONTROL_COUNT];
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struct work_struct spdif_input_bits_work;
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wait_queue_head_t ac97_waitqueue;
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};
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struct oxygen_model {
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@ -85,14 +85,22 @@ EXPORT_SYMBOL(oxygen_write32_masked);
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static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(1);
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do {
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udelay(5);
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cond_resched();
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if (oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS) & mask)
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return 0;
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} while (time_after_eq(timeout, jiffies));
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return -EIO;
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u8 status = 0;
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/*
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* Reading the status register also clears the bits, so we have to save
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* the read bits in status.
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*/
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wait_event_timeout(chip->ac97_waitqueue,
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({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
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status & mask; }),
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msecs_to_jiffies(1) + 1);
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/*
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* Check even after a timeout because this function should not require
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* the AC'97 interrupt to be enabled.
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*/
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status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
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return status & mask ? 0 : -EIO;
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}
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/*
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@ -53,7 +53,8 @@ static irqreturn_t oxygen_interrupt(int dummy, void *dev_id)
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OXYGEN_CHANNEL_MULTICH |
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OXYGEN_CHANNEL_AC97 |
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OXYGEN_INT_SPDIF_IN_DETECT |
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OXYGEN_INT_GPIO);
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OXYGEN_INT_GPIO |
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OXYGEN_INT_AC97);
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if (clear) {
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if (clear & OXYGEN_INT_SPDIF_IN_DETECT)
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chip->interrupt_mask &= ~OXYGEN_INT_SPDIF_IN_DETECT;
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@ -89,6 +90,9 @@ static irqreturn_t oxygen_interrupt(int dummy, void *dev_id)
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if ((status & OXYGEN_INT_MIDI) && chip->midi)
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snd_mpu401_uart_interrupt(0, chip->midi->private_data);
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if (status & OXYGEN_INT_AC97)
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wake_up(&chip->ac97_waitqueue);
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return IRQ_HANDLED;
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}
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@ -306,7 +310,9 @@ static void __devinit oxygen_init(struct oxygen *chip)
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(2 << OXYGEN_A_MONITOR_ROUTE_2_SHIFT) |
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(3 << OXYGEN_A_MONITOR_ROUTE_3_SHIFT));
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oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK, 0);
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oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK,
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OXYGEN_AC97_INT_READ_DONE |
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OXYGEN_AC97_INT_WRITE_DONE);
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oxygen_write32(chip, OXYGEN_AC97_OUT_CONFIG, 0);
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oxygen_write32(chip, OXYGEN_AC97_IN_CONFIG, 0);
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if (!(chip->has_ac97_0 | chip->has_ac97_1))
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@ -408,6 +414,7 @@ int __devinit oxygen_pci_probe(struct pci_dev *pci, int index, char *id,
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mutex_init(&chip->mutex);
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INIT_WORK(&chip->spdif_input_bits_work,
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oxygen_spdif_input_bits_changed);
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init_waitqueue_head(&chip->ac97_waitqueue);
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err = pci_enable_device(pci);
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if (err < 0)
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@ -471,7 +478,7 @@ int __devinit oxygen_pci_probe(struct pci_dev *pci, int index, char *id,
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oxygen_proc_init(chip);
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spin_lock_irq(&chip->reg_lock);
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chip->interrupt_mask |= OXYGEN_INT_SPDIF_IN_DETECT;
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chip->interrupt_mask |= OXYGEN_INT_SPDIF_IN_DETECT | OXYGEN_INT_AC97;
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oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
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spin_unlock_irq(&chip->reg_lock);
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