ALSA: snd-meastro3: Ignore spurious HV interrupts during suspend / resume

commit 715aa675338ce6e1a3b4f77cf87ea611f93058a8 upstream.

Ignore spurious HV interrupts during suspend / resume, this avoids
mistaking them for a mute button press. This is not very pretty but
it seems the only way to fix the master volume control gets muted
after suspend issue I'm seeing. Note that the es1968 driver is doing
exactly the same.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
index 491a2fc5a16472a8595e73ce8bdf00e6e3c041ba..c2311f85a331605d2c525c564704f07d5829b0fa 100644 (file)
--- a/sound/pci/maestro3.c
+++ b/sound/pci/maestro3.c
@@ -849,6 +849,7 @@ struct snd_m3 {
        struct snd_kcontrol *master_switch;
        struct snd_kcontrol *master_volume;
        struct tasklet_struct hwvol_tq;
+       unsigned int in_suspend;
 
 #ifdef CONFIG_PM
        u16 *suspend_mem;
@@ -1614,6 +1615,11 @@ static void snd_m3_update_hw_volume(unsigned long private_data)
        outb(0x88, chip->iobase + SHADOW_MIX_REG_MASTER);
        outb(0x88, chip->iobase + HW_VOL_COUNTER_MASTER);
 
+       /* Ignore spurious HV interrupts during suspend / resume, this avoids
+          mistaking them for a mute button press. */
+       if (chip->in_suspend)
+               return;
+
        if (!chip->master_switch || !chip->master_volume)
                return;
 
@@ -2425,6 +2431,7 @@ static int m3_suspend(struct pci_dev *pci, pm_message_t state)
        if (chip->suspend_mem == NULL)
                return 0;
 
+       chip->in_suspend = 1;
        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
        snd_pcm_suspend_all(chip->pcm);
        snd_ac97_suspend(chip->ac97);
@@ -2498,6 +2505,7 @@ static int m3_resume(struct pci_dev *pci)
        snd_m3_hv_init(chip);
 
        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+       chip->in_suspend = 0;
        return 0;
 }
 #endif /* CONFIG_PM */