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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: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Mengdong Lin 2015-04-29 17:43:12 +08:00 committed by Takashi Iwai
parent 0dd76f36ef
commit d4b7b13e19
2 changed files with 15 additions and 4 deletions
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18
sound/pci/hda/hda_i915.c
View File

@ -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)
acomp->ops->get_power(acomp->dev);
else
acomp->ops->put_power(acomp->dev);
if (enable) {
if (!hda->i915_power_refcount++)
acomp->ops->get_power(acomp->dev);
} 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);

1
sound/pci/hda/hda_intel.h
View File

@ -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