Messages in this thread | | | Date | Tue, 21 Sep 2021 12:11:28 +0100 | From | Mark Brown <> | Subject | Re: [PATCH] ASoC: pcm512x: Mend accesses to the I2S_1 and I2S_2 registers |
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On Tue, Sep 21, 2021 at 08:37:28AM +0200, Peter Rosin wrote:
> I expected it to just work to mark the register as readable and do > without the default value (i.e. the way it was before my patch). What > I don't understand is why regmap returns -EBUSY in that case. That > doesn't make sense to me. Perhaps that -EBUSY is propagated from the > I2C layer, but in that case, why is it then ok to do a write to > another register at the same spot in the code? So, why -EBUSY?
Actually one thing that can trigger this now I think about it is attempting to access a volatile register when the device is in cache only mode for power management reasons - if the device is in cache only mode then you can't do a hardware read so volatile registers become inaccessible. [unhandled content-type:application/pgp-signature] | |