linux-kernel - Re: [PATCH v3] platform/chrome: cros_ec: Send host event for prepare/complete

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Date:   Wed, 17 Aug 2022 15:55:05 -0600
From:   Raul Rangel <rrangel@...omium.org>
To:     Tim Van Patten <timvp@...gle.com>
Cc:     Rob Barnes <robbarnes@...gle.com>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] platform/chrome: cros_ec: Send host event for prepare/complete

LGTM

On Tue, Aug 2, 2022 at 11:40 AM Tim Van Patten <timvp@...gle.com> wrote:
>
> Update cros_ec_lpc_pm_ops to call cros_ec_lpc_prepare() during PM
> .prepare() and cros_ec_lpc_complete() during .complete(). This allows the
> EC to log entry/exit of AP's suspend/resume more accurately.
>
> Signed-off-by: Tim Van Patten <timvp@...gle.com>
> ---
>
> Changes in v3:
> - Update cros_ec_lpc_suspend() to cros_ec_lpc_prepare()
> - Update cros_ec_lpc_resume() to cros_ec_lpc_complete()
>
> Changes in v2:
> - Include cros_ec_resume() return value in dev_info() output.
> - Guard setting .prepare/.complete with #ifdef CONFIG_PM_SLEEP.
>
>  drivers/platform/chrome/cros_ec_lpc.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
> index 7677ab3c0ead9..4158bdeee197b 100644
> --- a/drivers/platform/chrome/cros_ec_lpc.c
> +++ b/drivers/platform/chrome/cros_ec_lpc.c
> @@ -530,23 +530,31 @@ static const struct dmi_system_id cros_ec_lpc_dmi_table[] __initconst = {
>  MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table);
>
>  #ifdef CONFIG_PM_SLEEP
> -static int cros_ec_lpc_suspend(struct device *dev)
> +static int cros_ec_lpc_prepare(struct device *dev)
>  {
>         struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
>
> +       dev_info(dev, "Prepare EC suspend\n");
> +
>         return cros_ec_suspend(ec_dev);
>  }
>
> -static int cros_ec_lpc_resume(struct device *dev)
> +static void cros_ec_lpc_complete(struct device *dev)
>  {
>         struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
> +       int ret;
> +
> +       ret = cros_ec_resume(ec_dev);
>
> -       return cros_ec_resume(ec_dev);
> +       dev_info(dev, "EC resume completed: ret = %d\n", ret);
>  }
>  #endif
>
>  static const struct dev_pm_ops cros_ec_lpc_pm_ops = {
> -       SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_lpc_suspend, cros_ec_lpc_resume)
> +#ifdef CONFIG_PM_SLEEP
> +       .prepare = cros_ec_lpc_prepare,
> +       .complete = cros_ec_lpc_complete
> +#endif
>  };
>
>  static struct platform_driver cros_ec_lpc_driver = {
> --
> 2.37.1.455.g008518b4e5-goog
>

Signed-off-by: Raul E Rangel <rrangel@...omium.org>