Re: [PATCH 1/5] arm64: dts: qcom: sc7180: Bump up trogdor ts_reset_l drive strength

[Matthias Kaehlcke]

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>