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Commit 153770ec authored by Konrad Leszczynski's avatar Konrad Leszczynski Committed by Dmitry Shmidt
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ANDROID: usb: gadget: f_audio_source: disable the CPU C-states upon playback 



Due to the issue with the isoc transfers being interrupted
by the CPU going into the idle state, the C-states will be
disabled for the playback time.

Change-Id: If4e52673606923d7e33a1d1dbe0192b8ad24f78c
Signed-off-by: default avatarKonrad Leszczynski <konrad.leszczynski@intel.com>
Signed-off-by: default avatarRuss Weight <russell.h.weight@intel.com>
parent 6db5c3ea

drivers/usb/gadget/function/f_audio_source.c

+11 −0
Original line number Original line Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/device.h>

#include <linux/device.h>

#include <linux/usb/audio.h>

#include <linux/usb/audio.h>

#include <linux/wait.h>

#include <linux/wait.h>

#include <linux/pm_qos.h>

#include <sound/core.h>

#include <sound/core.h>

#include <sound/initval.h>

#include <sound/initval.h>

#include <sound/pcm.h>

#include <sound/pcm.h>
@@ -268,6 +269,8 @@ struct audio_dev { 
	/* number of frames sent since start_time */

	/* number of frames sent since start_time */

	s64				frames_sent;

	s64				frames_sent;

	struct audio_source_config	*config;

	struct audio_source_config	*config;

	/* for creating and issuing QoS requests */

	struct pm_qos_request pm_qos;

};

};





static inline struct audio_dev *func_to_audio(struct usb_function *f)

static inline struct audio_dev *func_to_audio(struct usb_function *f)
@@ -740,6 +743,10 @@ static int audio_pcm_open(struct snd_pcm_substream *substream) 
	runtime->hw.channels_max = 2;

	runtime->hw.channels_max = 2;





	audio->substream = substream;

	audio->substream = substream;



	/* Add the QoS request and set the latency to 0 */

	pm_qos_add_request(&audio->pm_qos, PM_QOS_CPU_DMA_LATENCY, 0);



	return 0;

	return 0;

}

}
@@ -749,6 +756,10 @@ static int audio_pcm_close(struct snd_pcm_substream *substream) 
	unsigned long flags;

	unsigned long flags;





	spin_lock_irqsave(&audio->lock, flags);

	spin_lock_irqsave(&audio->lock, flags);



	/* Remove the QoS request */

	pm_qos_remove_request(&audio->pm_qos);



	audio->substream = NULL;

	audio->substream = NULL;

	spin_unlock_irqrestore(&audio->lock, flags);

	spin_unlock_irqrestore(&audio->lock, flags);