On Fri, Jan 21, 2022 at 10:20:55AM -0500, Detlev Casanova wrote:
> From: Dave Stevenson <dave.stevenson@raspberrypi.com>
> 
> The I2C to the Atmel is very fussy, and locks up easily on
> Pi0-3 particularly on reads.
> 
> The LCD power status is controlled solely by this driver, so
> rather than reading it back from the Atmel, use the cached
> status last set.

If that's the case since you're using regmap would it not make sense to
enable caching in order to minimise reads in general.