[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>
diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h
index 8fc9e7c..55ce244 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -3,6 +3,7 @@
#include <linux/mutex.h>
#include <linux/spinlock.h>
+#include <linux/wait.h>
#include <linux/workqueue.h>
#include "oxygen_regs.h"
@@ -65,6 +66,7 @@
struct snd_pcm_substream *streams[PCM_COUNT];
struct snd_kcontrol *controls[CONTROL_COUNT];
struct work_struct spdif_input_bits_work;
+ wait_queue_head_t ac97_waitqueue;
};
struct oxygen_model {
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index d0cdce0..74e23ef 100644
--- a/sound/pci/oxygen/oxygen_io.c
+++ b/sound/pci/oxygen/oxygen_io.c
@@ -85,14 +85,22 @@
static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
{
- unsigned long timeout = jiffies + msecs_to_jiffies(1);
- do {
- udelay(5);
- cond_resched();
- if (oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS) & mask)
- return 0;
- } while (time_after_eq(timeout, jiffies));
- return -EIO;
+ u8 status = 0;
+
+ /*
+ * Reading the status register also clears the bits, so we have to save
+ * the read bits in status.
+ */
+ wait_event_timeout(chip->ac97_waitqueue,
+ ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
+ status & mask; }),
+ msecs_to_jiffies(1) + 1);
+ /*
+ * Check even after a timeout because this function should not require
+ * the AC'97 interrupt to be enabled.
+ */
+ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
+ return status & mask ? 0 : -EIO;
}
/*
diff --git a/sound/pci/oxygen/oxygen_lib.c b/sound/pci/oxygen/oxygen_lib.c
index d98867c..de6bf41 100644
--- a/sound/pci/oxygen/oxygen_lib.c
+++ b/sound/pci/oxygen/oxygen_lib.c
@@ -53,7 +53,8 @@
OXYGEN_CHANNEL_MULTICH |
OXYGEN_CHANNEL_AC97 |
OXYGEN_INT_SPDIF_IN_DETECT |
- OXYGEN_INT_GPIO);
+ OXYGEN_INT_GPIO |
+ OXYGEN_INT_AC97);
if (clear) {
if (clear & OXYGEN_INT_SPDIF_IN_DETECT)
chip->interrupt_mask &= ~OXYGEN_INT_SPDIF_IN_DETECT;
@@ -89,6 +90,9 @@
if ((status & OXYGEN_INT_MIDI) && chip->midi)
snd_mpu401_uart_interrupt(0, chip->midi->private_data);
+ if (status & OXYGEN_INT_AC97)
+ wake_up(&chip->ac97_waitqueue);
+
return IRQ_HANDLED;
}
@@ -306,7 +310,9 @@
(2 << OXYGEN_A_MONITOR_ROUTE_2_SHIFT) |
(3 << OXYGEN_A_MONITOR_ROUTE_3_SHIFT));
- oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK, 0);
+ oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK,
+ OXYGEN_AC97_INT_READ_DONE |
+ OXYGEN_AC97_INT_WRITE_DONE);
oxygen_write32(chip, OXYGEN_AC97_OUT_CONFIG, 0);
oxygen_write32(chip, OXYGEN_AC97_IN_CONFIG, 0);
if (!(chip->has_ac97_0 | chip->has_ac97_1))
@@ -408,6 +414,7 @@
mutex_init(&chip->mutex);
INIT_WORK(&chip->spdif_input_bits_work,
oxygen_spdif_input_bits_changed);
+ init_waitqueue_head(&chip->ac97_waitqueue);
err = pci_enable_device(pci);
if (err < 0)
@@ -471,7 +478,7 @@
oxygen_proc_init(chip);
spin_lock_irq(&chip->reg_lock);
- chip->interrupt_mask |= OXYGEN_INT_SPDIF_IN_DETECT;
+ chip->interrupt_mask |= OXYGEN_INT_SPDIF_IN_DETECT | OXYGEN_INT_AC97;
oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
spin_unlock_irq(&chip->reg_lock);