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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20190812081213.GI4594@dell>
Date:   Mon, 12 Aug 2019 09:12:13 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: intel-lpss: Remove D3cold delay

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@...onical.com>
> ---
>  drivers/mfd/intel-lpss-pci.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied, thanks.

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