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ALSA: usb-audio: Manage auto-pm of all bundled interfaces 

Currently USB-audio driver manages the auto-pm of the primary
interface although a card may consist of multiple interfaces.
This may leave the secondary and other interfaces left running
unnecessarily after the auto-suspend.

This patch allows the driver managing the auto-pm of all bundled
interfaces per card.  The chip->pm_intf field is extended as
chip->intf[] to contain the array of assigned interfaces, and the
runtime-PM is performed to all those interfaces.

Tested-by: Macpaul Lin <macpaul.lin@mediatek.com>
Link: https://lore.kernel.org/r/20200605064117.28504-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
alistair/sunxi64-5.8
Takashi Iwai 2020-06-05 08:41:17 +02:00
parent 573fcbfd31
commit 88d8822d30
2 changed files with 33 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
sound/usb/card.c
View File

@ -634,7 +634,6 @@ static int usb_audio_probe(struct usb_interface *intf,
id, &chip);
if (err < 0)
goto __error;
chip->pm_intf = intf;
break;
} else if (vid[i] != -1 || pid[i] != -1) {
dev_info(&dev->dev,
@ -651,6 +650,13 @@ static int usb_audio_probe(struct usb_interface *intf,
goto __error;
}
}
if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
err = -EINVAL;
goto __error;
}
dev_set_drvdata(&dev->dev, chip);
/*
@ -703,6 +709,7 @@ static int usb_audio_probe(struct usb_interface *intf,
}
usb_chip[chip->index] = chip;
chip->intf[chip->num_interfaces] = intf;
chip->num_interfaces++;
usb_set_intfdata(intf, chip);
atomic_dec(&chip->active);
@ -818,19 +825,37 @@ void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
int snd_usb_autoresume(struct snd_usb_audio *chip)
{
int i, err;
if (atomic_read(&chip->shutdown))
return -EIO;
if (atomic_inc_return(&chip->active) == 1)
return usb_autopm_get_interface(chip->pm_intf);
if (atomic_inc_return(&chip->active) != 1)
return 0;
for (i = 0; i < chip->num_interfaces; i++) {
err = usb_autopm_get_interface(chip->intf[i]);
if (err < 0) {
/* rollback */
while (--i >= 0)
usb_autopm_put_interface(chip->intf[i]);
atomic_dec(&chip->active);
return err;
}
}
return 0;
}
void snd_usb_autosuspend(struct snd_usb_audio *chip)
{
int i;
if (atomic_read(&chip->shutdown))
return;
if (atomic_dec_and_test(&chip->active))
usb_autopm_put_interface(chip->pm_intf);
if (!atomic_dec_and_test(&chip->active))
return;
for (i = 0; i < chip->num_interfaces; i++)
usb_autopm_put_interface(chip->intf[i]);
}
static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)

4
sound/usb/usbaudio.h
View File

@ -19,11 +19,13 @@
struct media_device;
struct media_intf_devnode;
#define MAX_CARD_INTERFACES 16
struct snd_usb_audio {
int index;
struct usb_device *dev;
struct snd_card *card;
struct usb_interface *pm_intf;
struct usb_interface *intf[MAX_CARD_INTERFACES];
u32 usb_id;
struct mutex mutex;
unsigned int system_suspend;