linux-kernel - Re: [PATCH v3 1/2] mfd: cros_ec: Add host_sleep_event

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Date:   Thu, 4 Apr 2019 11:38:50 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     Evan Green <evgreen@...omium.org>
Cc:     Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Furquan Shaikh <furquan@...omium.org>,
        Rajat Jain <rajatja@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Guenter Roeck <groeck@...omium.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v3 1/2] mfd: cros_ec: Add host_sleep_event_v1 command

On Wed, Apr 3, 2019 at 2:34 PM Evan Green <evgreen@...omium.org> wrote:
>
> Introduce the command and response structures for the second revision
> of the host sleep event. These structures are part of a new EC change
> that enables detection of failure to enter S0ix. The EC waits a
> kernel-specified timeout (or a default amount of time) for the S0_SLP
> pin to change, and wakes the system if that change does not occur in
> time.
>
> Signed-off-by: Evan Green <evgreen@...omium.org>
Reviewed-by: Rajat Jain <rajatja@...omium.org>

>
> ---
>
> Changes in v3: None
> Changes in v2:
> - Made unions anonymous
> - Replaced reserved union members with a comment
>
>  include/linux/mfd/cros_ec_commands.h | 57 ++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index fc91082d4c35..1cdb07c0ece1 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -2729,6 +2729,63 @@ struct ec_params_host_sleep_event {
>         uint8_t sleep_event;
>  } __packed;
>
> +/*
> + * Use a default timeout value (CONFIG_SLEEP_TIMEOUT_MS) for detecting sleep
> + * transition failures
> + */
> +#define EC_HOST_SLEEP_TIMEOUT_DEFAULT 0
> +
> +/* Disable timeout detection for this sleep transition */
> +#define EC_HOST_SLEEP_TIMEOUT_INFINITE 0xFFFF
> +
> +struct ec_params_host_sleep_event_v1 {
> +       /* The type of sleep being entered or exited. */
> +       uint8_t sleep_event;
> +
> +       /* Padding */
> +       uint8_t reserved;
> +       union {
> +               /* Parameters that apply for suspend messages. */
> +               struct {
> +                       /*
> +                        * The timeout in milliseconds between when this message
> +                        * is received and when the EC will declare sleep
> +                        * transition failure if the sleep signal is not
> +                        * asserted.
> +                        */
> +                       uint16_t sleep_timeout_ms;
> +               } suspend_params;
> +
> +               /* No parameters for non-suspend messages. */
> +       };
> +} __packed;
> +
> +/* A timeout occurred when this bit is set */
> +#define EC_HOST_RESUME_SLEEP_TIMEOUT 0x80000000
> +
> +/*
> + * The mask defining which bits correspond to the number of sleep transitions,
> + * as well as the maximum number of suspend line transitions that will be
> + * reported back to the host.
> + */
> +#define EC_HOST_RESUME_SLEEP_TRANSITIONS_MASK 0x7FFFFFFF
> +
> +struct ec_response_host_sleep_event_v1 {
> +       union {
> +               /* Response fields that apply for resume messages. */
> +               struct {
> +                       /*
> +                        * The number of sleep power signal transitions that
> +                        * occurred since the suspend message. The high bit
> +                        * indicates a timeout occurred.
> +                        */
> +                       uint32_t sleep_transitions;
> +               } resume_response;
> +
> +               /* No response fields for non-resume messages. */
> +       };
> +} __packed;
> +
>  /*****************************************************************************/
>  /* Smart battery pass-through */
>
> --
> 2.20.1
>