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Date:   Tue, 14 Jun 2022 05:30:18 +0000
From:   Tzung-Bi Shih <tzungbi@kernel.org>
To:     Stephen Boyd <swboyd@chromium.org>
Cc:     Benson Leung <bleung@chromium.org>, linux-kernel@vger.kernel.org,
        patches@lists.linux.dev, Guenter Roeck <groeck@chromium.org>,
        chrome-platform@lists.linux.dev, Evan Green <evgreen@chromium.org>,
        Rajat Jain <rajatja@chromium.org>,
        Matthias Kaehlcke <mka@chromium.org>,
        Hsin-Yi Wang <hsinyi@chromium.org>
Subject: Re: [PATCH v2] platform/chrome: cros_ec: Always expose last resume
 result
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References: <20220611061825.4119270-1-swboyd@chromium.org>
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On Fri, Jun 10, 2022 at 11:18:25PM -0700, Stephen Boyd wrote:
> @@ -135,10 +135,10 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
>  	buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;
>  
>  	ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
> -
> -	/* For now, report failure to transition to S0ix with a warning. */
> +	/* Report failure to transition to system wide suspend with a warning. */
>  	if (ret >= 0 && ec_dev->host_sleep_v1 &&
> -	    (sleep_event == HOST_SLEEP_EVENT_S0IX_RESUME)) {
> +	    (sleep_event == HOST_SLEEP_EVENT_S0IX_RESUME ||
> +	     sleep_event == HOST_SLEEP_EVENT_S3_RESUME)) {
>  		ec_dev->last_resume_result =
>  			buf.u.resp1.resume_response.sleep_transitions;

The warning in the if-block:
WARN_ONCE(buf.u.resp1.resume_response.sleep_transitions &
          EC_HOST_RESUME_SLEEP_TIMEOUT,
          "EC detected sleep transition timeout. Total slp_s0 transitions: %d",
          buf.u.resp1.resume_response.sleep_transitions &
          EC_HOST_RESUME_SLEEP_TRANSITIONS_MASK);

Not sure and I wonder if the term "slp_s0" is still generic enough to the case.
And also [1].

[1]: https://crrev.com/a311a7657ca0a488f507fa78fd9c2d825cbf083e/power_manager/powerd/system/suspend_configurator.cc#98

At least we should fix [2] once the patch landed.

[2]: https://crrev.com/a311a7657ca0a488f507fa78fd9c2d825cbf083e/power_manager/tools/suspend_stress_test#369