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Commit d4b7b13e authored by Mengdong Lin's avatar Mengdong Lin Committed by Takashi Iwai
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ALSA: hda - implement a refcount for i915 power well switch 



This is to check the refcount of audio driver and reduce calling to i915.

Signed-off-by: default avatarMengdong Lin <mengdong.lin@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 0dd76f36

sound/pci/hda/hda_i915.c

+14 −4
Original line number Diff line number Diff line
@@ -42,10 +42,15 @@ int hda_display_power(struct hda_intel *hda, bool enable) 


	dev_dbg(&hda->chip.pci->dev, "display power %s\n",

		enable ? "enable" : "disable");

	if (enable)



	if (enable) {

		if (!hda->i915_power_refcount++)

			acomp->ops->get_power(acomp->dev);

	else

	} else {

		WARN_ON(!hda->i915_power_refcount);

		if (!--hda->i915_power_refcount)

			acomp->ops->put_power(acomp->dev);

	}



	return 0;

}
@@ -183,6 +188,11 @@ int hda_i915_init(struct hda_intel *hda) 
int hda_i915_exit(struct hda_intel *hda)

{

	struct device *dev = &hda->chip.pci->dev;

	struct i915_audio_component *acomp = &hda->audio_component;



	WARN_ON(hda->i915_power_refcount);

	if (hda->i915_power_refcount > 0 && acomp->ops)

		acomp->ops->put_power(acomp->dev);



	component_master_del(dev, &hda_component_master_ops);

sound/pci/hda/hda_intel.h

+1 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ struct hda_intel { 


	/* i915 component interface */

	struct i915_audio_component audio_component;

	int i915_power_refcount;

};



#ifdef CONFIG_SND_HDA_I915