linux-kernel - Re: [PATCH v3] platform/chrome: cros_ec: Notify the PM of wake events during resume

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Date:   Tue, 13 Sep 2022 11:28:51 -0700
From:   Benson Leung <bleung@...omium.org>
To:     Jameson Thies <jthies@...gle.com>
Cc:     chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        pmalani@...omium.org, groeck@...omium.org, tzungbi@...nel.org
Subject: Re: [PATCH v3] platform/chrome: cros_ec: Notify the PM of wake events
 during resume

Hi Jameson,

On Tue, Sep 13, 2022 at 7:55 AM Jameson Thies <jthies@...gle.com> wrote:
>
> cros_ec_handle_event in the cros_ec driver can notify the PM of wake
> events. When a device is suspended, cros_ec_handle_event will not check
> MKBP events. Instead, received MKBP events are checked during resume by
> cros_ec_report_events_during_suspend. But
> cros_ec_report_events_during_suspend cannot notify the PM if received
> events are wake events, causing wake events to not be reported if
> received while the device is suspended.
>
> Update cros_ec_report_events_during_suspend to notify the PM of wake
> events during resume by calling pm_wakeup_event.
>
> Signed-off-by: Jameson Thies <jthies@...gle.com>

Reviewed-by: Benson Leung <bleung@...omium.org>

> ---
>
> Changes since v1:
> - Updated wording in commit message from "Log" to "Notify PM of".
>
> Changes since v2:
> - Removed Reviewed-by tag and provided more context for the update in
>   the commit message.
> ---
>  drivers/platform/chrome/cros_ec.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
> index 8aace50d446d..110df0fd4b00 100644
> --- a/drivers/platform/chrome/cros_ec.c
> +++ b/drivers/platform/chrome/cros_ec.c
> @@ -349,10 +349,16 @@ EXPORT_SYMBOL(cros_ec_suspend);
>
>  static void cros_ec_report_events_during_suspend(struct cros_ec_device *ec_dev)
>  {
> +       bool wake_event;
> +
>         while (ec_dev->mkbp_event_supported &&
> -              cros_ec_get_next_event(ec_dev, NULL, NULL) > 0)
> +              cros_ec_get_next_event(ec_dev, &wake_event, NULL) > 0) {
>                 blocking_notifier_call_chain(&ec_dev->event_notifier,
>                                              1, ec_dev);
> +
> +               if (wake_event && device_may_wakeup(ec_dev->dev))
> +                       pm_wakeup_event(ec_dev->dev, 0);
> +       }
>  }
>
>  /**
> --
> 2.37.2.789.g6183377224-goog
>


-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org