On 04/05/2012 12:28 PM, Stephen Warren wrote:
From: Stephen Warren swarren@nvidia.com
The ASoC core currently defaults to using STANDBY rather than OFF for idle ASoC platform devices, which causes a permanent pm_runtime_get() on them. This keeps the device active unnecessarily. This can be especially problematic when the ASoC platform device and DAI device are the same device.
The distinction between OFF and STANDBY is likely not relevant for ASoC platform drivers, since they aren't analog devices. So, solve this issue by hard-coding idle_bias_off = 1 for all ASoC platform devices. If this turns out to be a problem, this value could be sourced from the snd_soc_platform_driver, similarly to soc_probe_codec().
Sorry, I forgot to mention that future Tegra ASoC changes will depend on this change at runtime for correct operation.