On Thu, Dec 08, 2022 at 11:20:02AM -0800, Douglas Anderson wrote: > On at least one board (pazquel360) the reset line for the touchscreen > was scoped and found to take almost 2 ms to fall when we drove it > low. This wasn't great because the Linux driver for the touchscreen > (the elants_i2c driver) thinks it can do a 500 us reset pulse. If we > bump the drive strength to 8 mA then the reset line went down in ~421 > us. > > NOTE: we could apply this fix just for pazquel360, but: > * Probably other trogdor devices have similar timings and it's just > that nobody has noticed it before. > * There are other trogdor boards using the same elan driver that tries > to do 500 us reset pulses. > * Bumping the drive strength to 8mA across the board won't hurt. This > isn't a high speed signal or anything. > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
