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Commit a5e7e07c authored by Mengdong Lin's avatar Mengdong Lin Committed by Takashi Iwai
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ALSA: hda - allow a codec to control the link power 



A flag "link_power_control" is added to indicate whether a codec needs to
control the link power.  And a new bus ops link_power() is defined for the
codec to request to enable/disable the link power.

Signed-off-by: default avatarMengdong Lin <mengdong.lin@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent d4b7b13e

include/sound/hdaudio.h

+4 −0
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ struct hdac_device { 


	/* misc flags */

	atomic_t in_pm;		/* suspend/resume being performed */

	bool  link_power_control:1;



	/* sysfs */

	struct hdac_widget_tree *widgets;
@@ -184,6 +185,8 @@ struct hdac_bus_ops { 
	/* get a response from the last command */

	int (*get_response)(struct hdac_bus *bus, unsigned int addr,

			    unsigned int *res);

	/* control the link power  */

	int (*link_power)(struct hdac_bus *bus, bool enable);

};



/*
@@ -311,6 +314,7 @@ static inline void snd_hdac_codec_link_down(struct hdac_device *codec) 
int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);

int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,

			      unsigned int *res);

int snd_hdac_link_power(struct hdac_device *codec, bool enable);



bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);

void snd_hdac_bus_stop_chip(struct hdac_bus *bus);

sound/hda/hdac_device.c

+15 −0
Original line number Diff line number Diff line
@@ -552,6 +552,21 @@ void snd_hdac_power_down_pm(struct hdac_device *codec) 
EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);

#endif



/*

 * Enable/disable the link power for a codec.

 */

int snd_hdac_link_power(struct hdac_device *codec, bool enable)

{

	if  (!codec->link_power_control)

		return 0;



	if  (codec->bus->ops->link_power)

		return codec->bus->ops->link_power(codec->bus, enable);

	else

		return -EINVAL;

}

EXPORT_SYMBOL_GPL(snd_hdac_link_power);



/* codec vendor labels */

struct hda_vendor_id {

	unsigned int id;

sound/pci/hda/hda_codec.c

+4 −0
Original line number Diff line number Diff line
@@ -857,6 +857,7 @@ void snd_hda_codec_register(struct hda_codec *codec) 
		return;

	if (device_is_registered(hda_codec_dev(codec))) {

		snd_hda_register_beep_device(codec);

		snd_hdac_link_power(&codec->core, true);

		pm_runtime_enable(hda_codec_dev(codec));

		/* it was powered up in snd_hda_codec_new(), now all done */

		snd_hda_power_down(codec);
@@ -883,6 +884,7 @@ static int snd_hda_codec_dev_free(struct snd_device *device) 
	struct hda_codec *codec = device->device_data;



	codec->in_freeing = 1;

	snd_hdac_link_power(&codec->core, false);

	snd_hdac_device_unregister(&codec->core);

	put_device(hda_codec_dev(codec));

	return 0;
@@ -3102,6 +3104,7 @@ static int hda_codec_runtime_suspend(struct device *dev) 
	if (codec_has_clkstop(codec) && codec_has_epss(codec) &&

	    (state & AC_PWRST_CLK_STOP_OK))

		snd_hdac_codec_link_down(&codec->core);

	snd_hdac_link_power(&codec->core, false);

	return 0;

}
@@ -3109,6 +3112,7 @@ static int hda_codec_runtime_resume(struct device *dev) 
{

	struct hda_codec *codec = dev_to_hda_codec(dev);



	snd_hdac_link_power(&codec->core, true);

	snd_hdac_codec_link_up(&codec->core);

	hda_call_codec_resume(codec);

	pm_runtime_mark_last_busy(dev);