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: Mengdong Lin <mengdong.lin@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -74,6 +74,7 @@ struct hdac_device {
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/* misc flags */
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atomic_t in_pm; /* suspend/resume being performed */
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bool link_power_control:1;
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/* sysfs */
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struct hdac_widget_tree *widgets;
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@ -184,6 +185,8 @@ struct hdac_bus_ops {
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/* get a response from the last command */
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int (*get_response)(struct hdac_bus *bus, unsigned int addr,
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unsigned int *res);
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/* control the link power */
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int (*link_power)(struct hdac_bus *bus, bool enable);
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};
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/*
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@ -311,6 +314,7 @@ static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
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int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
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int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
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unsigned int *res);
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int snd_hdac_link_power(struct hdac_device *codec, bool enable);
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bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
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void snd_hdac_bus_stop_chip(struct hdac_bus *bus);
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@ -552,6 +552,21 @@ void snd_hdac_power_down_pm(struct hdac_device *codec)
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EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
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#endif
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/*
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* Enable/disable the link power for a codec.
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*/
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int snd_hdac_link_power(struct hdac_device *codec, bool enable)
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{
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if (!codec->link_power_control)
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return 0;
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if (codec->bus->ops->link_power)
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return codec->bus->ops->link_power(codec->bus, enable);
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else
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_link_power);
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/* codec vendor labels */
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struct hda_vendor_id {
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unsigned int id;
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@ -857,6 +857,7 @@ void snd_hda_codec_register(struct hda_codec *codec)
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return;
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if (device_is_registered(hda_codec_dev(codec))) {
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snd_hda_register_beep_device(codec);
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snd_hdac_link_power(&codec->core, true);
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pm_runtime_enable(hda_codec_dev(codec));
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/* it was powered up in snd_hda_codec_new(), now all done */
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snd_hda_power_down(codec);
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@ -883,6 +884,7 @@ static int snd_hda_codec_dev_free(struct snd_device *device)
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struct hda_codec *codec = device->device_data;
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codec->in_freeing = 1;
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snd_hdac_link_power(&codec->core, false);
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snd_hdac_device_unregister(&codec->core);
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put_device(hda_codec_dev(codec));
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return 0;
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@ -3102,6 +3104,7 @@ static int hda_codec_runtime_suspend(struct device *dev)
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if (codec_has_clkstop(codec) && codec_has_epss(codec) &&
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(state & AC_PWRST_CLK_STOP_OK))
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snd_hdac_codec_link_down(&codec->core);
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snd_hdac_link_power(&codec->core, false);
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return 0;
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}
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@ -3109,6 +3112,7 @@ static int hda_codec_runtime_resume(struct device *dev)
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{
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struct hda_codec *codec = dev_to_hda_codec(dev);
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snd_hdac_link_power(&codec->core, true);
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snd_hdac_codec_link_up(&codec->core);
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hda_call_codec_resume(codec);
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pm_runtime_mark_last_busy(dev);
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