On Fri, Aug 18, 2023 at 01:20:06AM +0300, Marian Postevca wrote: > Mark Brown <broonie@xxxxxxxxxx> writes: > > This is saying that the machine driver should disable jack detection > > over suspend and restart it during resume. The machine driver should > > suspend before the rest of the card which should mean that the CODEC > > gets powered off then. The core can't tell if jack detection is > > supposed to work over suspend, it is a standard wake event on systems > > like phones, but it sounds like on this system the power gets removed > > from the device so that can't work. > Sorry, I don't understand what you are trying to say here. My intention > is to find a way to have sound working when suspending/resuming > with jack inserted by not fudging the jack in the machine driver but > fixing it in the CODEC. You'd need to pull the relevant supplies out of DAPM and handle them in the CODEC suspend/resume callback. > > I don't understand why that would be expected to help? The main effect > > of keeping the bias on all the time would be to consume more power. > I don't fully understand the whole bias thing (I did try hard to > understand it from the code), but in this specific instance it helps for > suspending the CODEC. If idle_bias_on is true then idle_bias_off will be Very old devices required keeping a reference voltage maintained at half the analog supply voltage, this supply is called the bias. It couldn't be powered on/off quickly so needed to be kept on all the time. I can't tell which driver you're using here so I can't tell if it's maintaining any system level power like that.
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