ALSA: es1968,maestro3 - Use work for hw-volume control

Instead of tasklet, use workq for handling the hw-volume control.
This reduces lots of spinlocks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 59 deletions

diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
index 64f6f627f4c2..0378126e6272 100644
--- a/sound/pci/maestro3.c
+++ b/sound/pci/maestro3.c
@@ -850,11 +850,10 @@ struct snd_m3 {
         struct input_dev *input_dev;
         char phys[64];                  /* physical device path */
 #else
-        spinlock_t ac97_lock;
         struct snd_kcontrol *master_switch;
         struct snd_kcontrol *master_volume;
-        struct tasklet_struct hwvol_tq;
 #endif
+        struct work_struct hwvol_work;
 
         unsigned int in_suspend;
 
@@ -1609,13 +1608,10 @@ static void snd_m3_update_ptr(struct snd_m3 *chip, struct m3_dma *s)
    (without wrap around) in response to volume button presses and then
    generating an interrupt. The pair of counters is stored in bits 1-3 and 5-7
    of a byte wide register. The meaning of bits 0 and 4 is unknown. */
-static void snd_m3_update_hw_volume(unsigned long private_data)
+static void snd_m3_update_hw_volume(struct work_struct *work)
 {
-        struct snd_m3 *chip = (struct snd_m3 *) private_data;
+        struct snd_m3 *chip = container_of(work, struct snd_m3, hwvol_work);
         int x, val;
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        unsigned long flags;
-#endif
 
         /* Figure out which volume control button was pushed,
            based on differences from the default register
@@ -1645,21 +1641,13 @@ static void snd_m3_update_hw_volume(unsigned long private_data)
         if (!chip->master_switch || !chip->master_volume)
                 return;
 
-        /* FIXME: we can't call snd_ac97_* functions since here is in tasklet. */
-        spin_lock_irqsave(&chip->ac97_lock, flags);
-
-        val = chip->ac97->regs[AC97_MASTER_VOL];
+        val = snd_ac97_read(chip->ac97, AC97_MASTER);
         switch (x) {
         case 0x88:
                 /* The counters have not changed, yet we've received a HV
                    interrupt. According to tests run by various people this
                    happens when pressing the mute button. */
                 val ^= 0x8000;
-                chip->ac97->regs[AC97_MASTER_VOL] = val;
-                outw(val, chip->iobase + CODEC_DATA);
-                outb(AC97_MASTER_VOL, chip->iobase + CODEC_COMMAND);
-                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               &chip->master_switch->id);
                 break;
         case 0xaa:
                 /* counters increased by 1 -> volume up */
@@ -1667,11 +1655,6 @@ static void snd_m3_update_hw_volume(unsigned long private_data)
                         val--;
                 if ((val & 0x7f00) > 0)
                         val -= 0x0100;
-                chip->ac97->regs[AC97_MASTER_VOL] = val;
-                outw(val, chip->iobase + CODEC_DATA);
-                outb(AC97_MASTER_VOL, chip->iobase + CODEC_COMMAND);
-                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               &chip->master_volume->id);
                 break;
         case 0x66:
                 /* counters decreased by 1 -> volume down */
@@ -1679,14 +1662,11 @@ static void snd_m3_update_hw_volume(unsigned long private_data)
                         val++;
                 if ((val & 0x7f00) < 0x1f00)
                         val += 0x0100;
-                chip->ac97->regs[AC97_MASTER_VOL] = val;
-                outw(val, chip->iobase + CODEC_DATA);
-                outb(AC97_MASTER_VOL, chip->iobase + CODEC_COMMAND);
-                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-                               &chip->master_volume->id);
                 break;
         }
-        spin_unlock_irqrestore(&chip->ac97_lock, flags);
+        if (snd_ac97_update(chip->ac97, AC97_MASTER, val))
+                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                               &chip->master_switch->id);
 #else
         if (!chip->input_dev)
                 return;
@@ -1730,11 +1710,7 @@ static irqreturn_t snd_m3_interrupt(int irq, void *dev_id)
                 return IRQ_NONE;
 
         if (status & HV_INT_PENDING)
-#ifdef CONFIG_SND_MAESTRO3_INPUT
-                snd_m3_update_hw_volume((unsigned long)chip);
-#else
-                tasklet_schedule(&chip->hwvol_tq);
-#endif
+                schedule_work(&chip->hwvol_work);
 
         /*
          * ack an assp int if its running
@@ -2000,24 +1976,14 @@ static unsigned short
 snd_m3_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 {
         struct snd_m3 *chip = ac97->private_data;
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        unsigned long flags;
-#endif
         unsigned short data = 0xffff;
 
         if (snd_m3_ac97_wait(chip))
                 goto fail;
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        spin_lock_irqsave(&chip->ac97_lock, flags);
-#endif
         snd_m3_outb(chip, 0x80 | (reg & 0x7f), CODEC_COMMAND);
         if (snd_m3_ac97_wait(chip))
-                goto fail_unlock;
+                goto fail;
         data = snd_m3_inw(chip, CODEC_DATA);
-fail_unlock:
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        spin_unlock_irqrestore(&chip->ac97_lock, flags);
-#endif
 fail:
         return data;
 }
@@ -2026,20 +1992,11 @@ static void
 snd_m3_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 {
         struct snd_m3 *chip = ac97->private_data;
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        unsigned long flags;
-#endif
 
         if (snd_m3_ac97_wait(chip))
                 return;
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        spin_lock_irqsave(&chip->ac97_lock, flags);
-#endif
         snd_m3_outw(chip, val, CODEC_DATA);
         snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        spin_unlock_irqrestore(&chip->ac97_lock, flags);
-#endif
 }
 
 
@@ -2458,6 +2415,7 @@ static int snd_m3_free(struct snd_m3 *chip)
         struct m3_dma *s;
         int i;
 
+        cancel_work_sync(&chip->hwvol_work);
 #ifdef CONFIG_SND_MAESTRO3_INPUT
         if (chip->input_dev)
                 input_unregister_device(chip->input_dev);
@@ -2511,6 +2469,7 @@ static int m3_suspend(struct pci_dev *pci, pm_message_t state)
                 return 0;
 
         chip->in_suspend = 1;
+        cancel_work_sync(&chip->hwvol_work);
         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
         snd_pcm_suspend_all(chip->pcm);
         snd_ac97_suspend(chip->ac97);
@@ -2667,9 +2626,6 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
         }
 
         spin_lock_init(&chip->reg_lock);
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        spin_lock_init(&chip->ac97_lock);
-#endif
 
         switch (pci->device) {
         case PCI_DEVICE_ID_ESS_ALLEGRO:
@@ -2683,6 +2639,7 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
         chip->card = card;
         chip->pci = pci;
         chip->irq = -1;
+        INIT_WORK(&chip->hwvol_work, snd_m3_update_hw_volume);
 
         chip->external_amp = enable_amp;
         if (amp_gpio >= 0 && amp_gpio <= 0x0f)
@@ -2752,10 +2709,6 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
 
         snd_m3_hv_init(chip);
 
-#ifndef CONFIG_SND_MAESTRO3_INPUT
-        tasklet_init(&chip->hwvol_tq, snd_m3_update_hw_volume, (unsigned long)chip);
-#endif
-
         if (request_irq(pci->irq, snd_m3_interrupt, IRQF_SHARED,
                         KBUILD_MODNAME, chip)) {
                 snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);