From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Lee Jones <lee.jones@linaro.org>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>,
jarkko.nikula@linux.intel.com, mika.westerberg@linux.intel.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mfd: intel-lpss: Remove D3cold delay
Date: Thu, 25 Jul 2019 16:42:48 +0300 [thread overview]
Message-ID: <20190725134248.GC9224@smile.fi.intel.com> (raw)
In-Reply-To: <20190725120554.GE23883@dell>
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
next prev parent reply other threads:[~2019-07-25 13:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-05 4:55 [PATCH] mfd: intel-lpss: Remove D3cold delay Kai-Heng Feng
2019-07-09 11:46 ` Andy Shevchenko
2019-07-25 12:05 ` Lee Jones
2019-07-25 13:42 ` Andy Shevchenko [this message]
2019-07-25 13:43 ` Andy Shevchenko
2019-08-12 8:12 ` Lee Jones
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