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SubjectRe: [PATCH v3 2/2] platform/chrome: Add support for v1 of host sleep event
On Wed, Apr 3, 2019 at 2:34 PM Evan Green <evgreen@chromium.org> wrote:
>
> Add support in code for the new forms of the host sleep event.
> Detects the presence of this version of the command at runtime,
> and use whichever form the EC supports. At this time, always
> request the default timeout, and only report the failing response
> via a WARN_ONCE(). Future versions could accept the sleep parameter
> from outside the driver, and return the response information to
> usermode or elsewhere.
>
> Signed-off-by: Evan Green <evgreen@chromium.org>
Reviewed-by: Rajat Jain <rajatja@chromium.org>

>
> ---
>
> Changes in v3:
> - Consolidated boolean logic for host_sleep_v1 (Guenter)
>
> Changes in v2:
> - Removed unnecessary version assignment (Guenter)
> - Changed WARN to WARN_ONCE (Guenter)
> - Fixed C code to use anonymous unions
> - insize is only bigger for resume events.
>
> drivers/mfd/cros_ec.c | 39 +++++++++++++++++++++----
> drivers/platform/chrome/cros_ec_proto.c | 6 ++++
> include/linux/mfd/cros_ec.h | 2 ++
> 3 files changed, 42 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 6acfe036d522..bd2bcdd4718b 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -75,20 +75,49 @@ static irqreturn_t ec_irq_thread(int irq, void *data)
>
> static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
> {
> + int ret;
> struct {
> struct cros_ec_command msg;
> - struct ec_params_host_sleep_event req;
> + union {
> + struct ec_params_host_sleep_event req0;
> + struct ec_params_host_sleep_event_v1 req1;
> + struct ec_response_host_sleep_event_v1 resp1;
> + } u;
> } __packed buf;
>
> memset(&buf, 0, sizeof(buf));
>
> - buf.req.sleep_event = sleep_event;
> + if (ec_dev->host_sleep_v1) {
> + buf.u.req1.sleep_event = sleep_event;
> + buf.u.req1.suspend_params.sleep_timeout_ms =
> + EC_HOST_SLEEP_TIMEOUT_DEFAULT;
> +
> + buf.msg.outsize = sizeof(buf.u.req1);
> + if ((sleep_event == HOST_SLEEP_EVENT_S3_RESUME) ||
> + (sleep_event == HOST_SLEEP_EVENT_S0IX_RESUME))
> + buf.msg.insize = sizeof(buf.u.resp1);
> +
> + buf.msg.version = 1;
> +
> + } else {
> + buf.u.req0.sleep_event = sleep_event;
> + buf.msg.outsize = sizeof(buf.u.req0);
> + }
>
> buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;
> - buf.msg.version = 0;
> - buf.msg.outsize = sizeof(buf.req);
>
> - return cros_ec_cmd_xfer(ec_dev, &buf.msg);
> + ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
> +
> + /* For now, report failure to transition to S0ix with a warning. */
> + if (ret >= 0 && ec_dev->host_sleep_v1 &&
> + (sleep_event == HOST_SLEEP_EVENT_S0IX_RESUME))
> + 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);
> +
> + return ret;
> }
>
> int cros_ec_register(struct cros_ec_device *ec_dev)
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 97a068dff192..52ca564a64e7 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -414,6 +414,12 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
> else
> ec_dev->mkbp_event_supported = 1;
>
> + /* Probe if host sleep v1 is supported for S0ix failure detection. */
> + ret = cros_ec_get_host_command_version_mask(ec_dev,
> + EC_CMD_HOST_SLEEP_EVENT,
> + &ver_mask);
> + ec_dev->host_sleep_v1 = (ret >= 0 && (ver_mask & EC_VER_MASK(1)));
> +
> /*
> * Get host event wake mask, assume all events are wake events
> * if unavailable.
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 8f2a8918bfa3..b6442201f77f 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -120,6 +120,7 @@ struct cros_ec_command {
> * @pkt_xfer: Send packet to EC and get response.
> * @lock: One transaction at a time.
> * @mkbp_event_supported: True if this EC supports the MKBP event protocol.
> + * @host_sleep_v1: True if this EC supports the sleep v1 command.
> * @event_notifier: Interrupt event notifier for transport devices.
> * @event_data: Raw payload transferred with the MKBP event.
> * @event_size: Size in bytes of the event data.
> @@ -153,6 +154,7 @@ struct cros_ec_device {
> struct cros_ec_command *msg);
> struct mutex lock;
> bool mkbp_event_supported;
> + bool host_sleep_v1;
> struct blocking_notifier_head event_notifier;
>
> struct ec_response_get_next_event_v1 event_data;
> --
> 2.20.1
>

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