linux-kernel - Re: [PATCH v2] platform/chrome: cros_ec: Always expose last resume result

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Message-ID: <CAE-0n53aiXq+eUC0gq=J0kO+_zFpZGnL42AgyEBVM-_wtccnJA@mail.gmail.com>
Date:   Mon, 13 Jun 2022 23:17:50 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Tzung-Bi Shih <tzungbi@...nel.org>
Cc:     Benson Leung <bleung@...omium.org>, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev, Evan Green <evgreen@...omium.org>,
        Rajat Jain <rajatja@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: Re: [PATCH v2] platform/chrome: cros_ec: Always expose last resume result

Quoting Tzung-Bi Shih (2022-06-13 22:30:18)
> 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

I don't know what "slp_s0" means. I guess it's some intelism? It could
change to "sleep" and work for me.

>
> At least we should fix [2] once the patch landed.
>
> [2]: https://crrev.com/a311a7657ca0a488f507fa78fd9c2d825cbf083e/power_manager/tools/suspend_stress_test#369

And by fix you mean change "S0iX" to "suspend"?