lkml.org 
[lkml]   [2018]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: mfd: cros_ec: Check for mkbp events on resume only if supported.
From
Date
Hi Ravi,

On 2018-08-20 17:34, RaviChandra Sadineni wrote:
> Currently on every resume we check for mkbp events and notify the
> clients. This helps in identifying the wakeup sources. But on devices
> that do not support mkbp protocol, we might end up querying key state of
> the keyboard in a loop which blocks the resume. Instead check for events
> only if mkbp is supported.
>
> Signed-off-by: RaviChandra Sadineni <ravisadineni@chromium.org>

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
>
> Note: This patch fixes the suspend/resume issue on Snow and Peach-Pit
> Chromebooks, both on vanilla v4.18 as well as linux-next from 20 August
> 2018. Further info at: https://lkml.org/lkml/2018/6/5/1076
>
> drivers/mfd/cros_ec.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 65a9757a6d21..fe6f83766144 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -218,7 +218,8 @@ EXPORT_SYMBOL(cros_ec_suspend);
>
> static void cros_ec_report_events_during_suspend(struct cros_ec_device *ec_dev)
> {
> - while (cros_ec_get_next_event(ec_dev, NULL) > 0)
> + while (ec_dev->mkbp_event_supported &&
> + cros_ec_get_next_event(ec_dev, NULL) > 0)
> blocking_notifier_call_chain(&ec_dev->event_notifier,
> 1, ec_dev);
> }

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

\
 
 \ /
  Last update: 2018-08-21 09:29    [W:0.067 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site