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authorClemens Ladisch <clemens@ladisch.de>2013-04-15 15:59:51 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-07 19:57:25 -0700
commit7d4dcfcf2e4351369720bbd8e6a65df56e0458d7 (patch)
tree02a3dacd1deaeae3644c35c480b032df0858a6f5 /sound
parent204435f3d3f96513892dfd13aa65298abfeed130 (diff)
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ALSA: usb-audio: disable autopm for MIDI devices
commit cbc200bca4b51a8e2406d4b654d978f8503d430b upstream. Commit 88a8516a2128 (ALSA: usbaudio: implement USB autosuspend) introduced autopm for all USB audio/MIDI devices. However, many MIDI devices, such as synthesizers, do not merely transmit MIDI messages but use their MIDI inputs to control other functions. With autopm, these devices would get powered down as soon as the last MIDI port device is closed on the host. Even some plain MIDI interfaces could get broken: they automatically send Active Sensing messages while powered up, but as soon as these messages cease, the receiving device would interpret this as an accidental disconnection. Commit f5f165418cab (ALSA: usb-audio: Fix missing autopm for MIDI input) introduced another regression: some devices (e.g. the Roland GAIA SH-01) are self-powered but do a reset whenever the USB interface's power state changes. To work around all this, just disable autopm for all USB MIDI devices. Reported-by: Laurens Holst Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/midi.c13
1 files changed, 2 insertions, 11 deletions
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 4376215..c635a2d 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -125,7 +125,6 @@ struct snd_usb_midi {
struct snd_usb_midi_in_endpoint *in;
} endpoints[MIDI_MAX_ENDPOINTS];
unsigned long input_triggered;
- bool autopm_reference;
unsigned int opened[2];
unsigned char disconnected;
unsigned char input_running;
@@ -1023,7 +1022,6 @@ static int substream_open(struct snd_rawmidi_substream *substream, int dir,
{
struct snd_usb_midi* umidi = substream->rmidi->private_data;
struct snd_kcontrol *ctl;
- int err;
down_read(&umidi->disc_rwsem);
if (umidi->disconnected) {
@@ -1034,13 +1032,6 @@ static int substream_open(struct snd_rawmidi_substream *substream, int dir,
mutex_lock(&umidi->mutex);
if (open) {
if (!umidi->opened[0] && !umidi->opened[1]) {
- err = usb_autopm_get_interface(umidi->iface);
- umidi->autopm_reference = err >= 0;
- if (err < 0 && err != -EACCES) {
- mutex_unlock(&umidi->mutex);
- up_read(&umidi->disc_rwsem);
- return -EIO;
- }
if (umidi->roland_load_ctl) {
ctl = umidi->roland_load_ctl;
ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
@@ -1063,8 +1054,6 @@ static int substream_open(struct snd_rawmidi_substream *substream, int dir,
snd_ctl_notify(umidi->card,
SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
}
- if (umidi->autopm_reference)
- usb_autopm_put_interface(umidi->iface);
}
}
mutex_unlock(&umidi->mutex);
@@ -2228,6 +2217,8 @@ int snd_usbmidi_create(struct snd_card *card,
return err;
}
+ usb_autopm_get_interface_no_resume(umidi->iface);
+
list_add_tail(&umidi->list, midi_list);
return 0;
}