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

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Date:   Thu, 25 Jul 2019 16:42:48 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: intel-lpss: Remove D3cold delay

On Thu, Jul 25, 2019 at 01:05:54PM +0100, Lee Jones wrote:
> On Tue, 09 Jul 2019, Andy Shevchenko wrote:
> 
> > On Fri, Jul 05, 2019 at 12:55:03PM +0800, 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.
> > 
> > Thank you for the patch. I took it to our internal testing and will tell
> > the result within couple of weeks.
> 
> Any news?

No bug reports, no negative feedback, I think we may proceed with it.
Thanks!

-- 
With Best Regards,
Andy Shevchenko