On Fri, Apr 24, 2015 at 2:28 AM, Mark Brown <broonie@xxxxxxxxxx> wrote: > On Thu, Apr 23, 2015 at 05:47:49PM -0700, Kevin Cernekee wrote: > >> This is mostly working OK, but regcache_sync() assumes that the >> hardware registers have been reset back to the default values. The >> "pdn" GPIO doesn't actually reset the state of the tas571x; it just >> makes I2C inaccessible and inhibits audio output. So if the factory >> default for mute is 0, corner cases like this fail: > > ... > >> Aside from unnecessarily pulsing the reset GPIO when transitioning >> back from SND_SOC_BIAS_OFF or overriding regcache_default_sync(), can >> you think of a way to work around this? > > Do you need to work around it? If the register map is being perserved > you don't need to sync so just don't do it - it's just that the normal > expectation would be that power down would cause the register map to be > reset. How do I tell regcache to write out any updates that happened while the hardware was inaccessible? I see that regmap->cache_dirty is 1, but nothing flushes it automatically when exiting cache_only mode. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
