Re: [PATCH] mfd: intel-lpss: Remove D3cold delay

[Lee Jones]

On Fri, 05 Jul 2019, Kai-Heng Feng wrote:

> Goodix touchpad may drop its first couple input events when
> i2c-designware-platdrv and intel-lpss it connects to took too long to
> runtime resume from runtime suspended state.
> 
> This issue happens becuase the touchpad has a rather small buffer to
> store up to 13 input events, so if the host doesn't read those events in
> time (i.e. runtime resume takes too long), events are dropped from the
> touchpad's buffer.
> 
> The bottleneck is D3cold delay it waits when transitioning from D3cold
> to D0, hence remove the delay to make the resume faster. I've tested
> some systems with intel-lpss and haven't seen any regression.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202683
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> ---
>  drivers/mfd/intel-lpss-pci.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied, thanks.

-- 
Lee Jones [æçæ]
Linaro Services Technical Lead
Linaro.org â Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog