Opt-in to use snd_hdac_ext_bus_link_power() to manage HDA link power up/down events.
This allows to reduce power consumption in cases where some HDA codecs are suspended, but other child devices (HDA or non-HDA codecs) remain active and controller itself remains in active state.
By using snd_hdac_ext_bus_link_power(), the individual HDA links can be powered off and if all HDA codecs are powered down, the command DMA can also be shut down.
Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com --- sound/soc/sof/intel/hda-bus.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/sound/soc/sof/intel/hda-bus.c b/sound/soc/sof/intel/hda-bus.c index 789148e5584b..1ac6e79d7e62 100644 --- a/sound/soc/sof/intel/hda-bus.c +++ b/sound/soc/sof/intel/hda-bus.c @@ -19,13 +19,21 @@ #define sof_hda_ext_ops NULL #endif
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA) +static const struct hdac_bus_ops bus_core_ops = { + .command = snd_hdac_bus_send_cmd, + .get_response = snd_hdac_bus_get_response, + .link_power = snd_hdac_ext_bus_link_power, +}; +#endif + /* * This can be used for both with/without hda link support. */ void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev) { #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA) - snd_hdac_ext_bus_init(bus, dev, NULL, sof_hda_ext_ops); + snd_hdac_ext_bus_init(bus, dev, &bus_core_ops, sof_hda_ext_ops); #else /* CONFIG_SND_SOC_SOF_HDA */ memset(bus, 0, sizeof(*bus)); bus->dev = dev;