forked from luck/tmp_suning_uos_patched
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>
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@ -42,10 +42,15 @@ int hda_display_power(struct hda_intel *hda, bool enable)
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dev_dbg(&hda->chip.pci->dev, "display power %s\n",
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enable ? "enable" : "disable");
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if (enable)
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acomp->ops->get_power(acomp->dev);
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else
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acomp->ops->put_power(acomp->dev);
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if (enable) {
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if (!hda->i915_power_refcount++)
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acomp->ops->get_power(acomp->dev);
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} else {
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WARN_ON(!hda->i915_power_refcount);
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if (!--hda->i915_power_refcount)
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acomp->ops->put_power(acomp->dev);
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}
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return 0;
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}
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@ -183,6 +188,11 @@ int hda_i915_init(struct hda_intel *hda)
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int hda_i915_exit(struct hda_intel *hda)
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{
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struct device *dev = &hda->chip.pci->dev;
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struct i915_audio_component *acomp = &hda->audio_component;
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WARN_ON(hda->i915_power_refcount);
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if (hda->i915_power_refcount > 0 && acomp->ops)
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acomp->ops->put_power(acomp->dev);
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component_master_del(dev, &hda_component_master_ops);
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@ -46,6 +46,7 @@ struct hda_intel {
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/* i915 component interface */
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struct i915_audio_component audio_component;
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int i915_power_refcount;
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};
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#ifdef CONFIG_SND_HDA_I915
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