Re: [PATCH] soundwire: intel: don't return error when clock stop failed
From: Vinod Koul
Date: Tue Jan 19 2021 - 12:53:50 EST
On 14-01-21, 11:02, Bard Liao wrote:
> dev->power.runtime_error will be set to the return value of the runtime
> suspend callback function, and runtime resume function will return
> -EINVAL if dev->power.runtime_error is not 0.
> Somehow the codec rarely doesn't return an ACK to the clock prepare
> command. If we stop the runtime suspend process and return error, we
> will not be able to resume again. Likewise, if the codec lost sync and
> did not rejoin, the resume operation will also fail. As a result, the
> SoundWire bus can not be used anymore.
> This patch suggests to finish the runtime suspend process even if we fail
> to stop sdw bus clock. In the case where we do a hardware reset, the codecs
> will be reconfigured completely. In the case where we use the regular clock
> stop, the codecs keep their state and worst case will fall off the bus and
> The only drawback is that the power consumption may be higher and
> device-initiated interrupts may be lost, but at least audio function can
> still work after resume.