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Commit 9ca42c45 authored by Mike Lockwood's avatar Mike Lockwood Committed by Vineeta Srivastava
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usb: gadget: audio: Fix problem resuming playback on alt interface change

If the alternate interface is set back to 1, we now resume playback
if still triggered.

Bug: 12549807
(cherry picked from commit 898bafb4)

Change-Id: I6c3eb43ebafbc8a101ae83e7864097be5b07a0f9
parent 485db764
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......@@ -260,6 +260,7 @@ struct audio_dev {
s64 frames_sent;
bool audio_ep_enabled;
bool triggered;
};
static inline struct audio_dev *func_to_audio_source(struct usb_function *f)
......@@ -267,6 +268,8 @@ static inline struct audio_dev *func_to_audio_source(struct usb_function *f)
return container_of(f, struct audio_dev, func);
}
static void audio_pcm_playback_start(struct audio_dev *audio);
/*-------------------------------------------------------------------------*/
static struct usb_request *audio_request_new(struct usb_ep *ep, int buffer_size)
......@@ -545,6 +548,10 @@ static int audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
return ret;
}
audio->audio_ep_enabled = true;
if (audio->triggered) {
// resume playing if we are still triggered
audio_pcm_playback_start(audio);
}
} else if (!alt && audio->audio_ep_enabled) {
usb_ep_disable(audio->in_ep);
audio->audio_ep_enabled = false;
......@@ -767,11 +774,13 @@ static int audio_pcm_playback_trigger(struct snd_pcm_substream *substream,
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
audio->triggered = 1;
audio_pcm_playback_start(audio);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
audio->triggered = 0;
audio_pcm_playback_stop(audio);
break;
......
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