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Message-ID: <20170314135615.p2l5op6uarniilsg@dell>
Date: Tue, 14 Mar 2017 13:56:15 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Thierry Escande <thierry.escande@...labora.com>
Cc: Benson Leung <bleung@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] cros_ec: Don't signal wake event for non-wake
host events
On Tue, 14 Feb 2017, Thierry Escande wrote:
> From: Shawn Nematbakhsh <shawnn@...omium.org>
>
> The subset of wake-enabled host events is defined by the EC, but the EC
> may still send non-wake host events if we're in the process of
> suspending. Get the mask of wake-enabled host events from the EC and
> filter out non-wake events to prevent spurious aborted suspend
> attempts.
>
> Signed-off-by: Shawn Nematbakhsh <shawnn@...omium.org>
> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
> ---
> drivers/mfd/cros_ec.c | 13 ++++--
> drivers/platform/chrome/cros_ec_proto.c | 76 ++++++++++++++++++++++++++++++---
> include/linux/mfd/cros_ec.h | 5 ++-
> 3 files changed, 85 insertions(+), 9 deletions(-)
Looks okay from an MFD perspective:
For my own reference:
Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 9b66a98..1bcb502 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -54,12 +54,19 @@ static const struct mfd_cell ec_pd_cell = {
> static irqreturn_t ec_irq_thread(int irq, void *data)
> {
> struct cros_ec_device *ec_dev = data;
> + bool wake_event = true;
> int ret;
>
> - if (device_may_wakeup(ec_dev->dev))
> + ret = cros_ec_get_next_event(ec_dev, &wake_event);
> +
> + /*
> + * Signal only if wake host events or any interrupt if
> + * cros_ec_get_next_event() returned an error (default value for
> + * wake_event is true)
> + */
> + if (wake_event && device_may_wakeup(ec_dev->dev))
> pm_wakeup_event(ec_dev->dev, 0);
>
> - ret = cros_ec_get_next_event(ec_dev);
> if (ret > 0)
> blocking_notifier_call_chain(&ec_dev->event_notifier,
> 0, ec_dev);
> @@ -212,7 +219,7 @@ EXPORT_SYMBOL(cros_ec_suspend);
>
> static void cros_ec_drain_events(struct cros_ec_device *ec_dev)
> {
> - while (cros_ec_get_next_event(ec_dev) > 0)
> + while (cros_ec_get_next_event(ec_dev, NULL) > 0)
> blocking_notifier_call_chain(&ec_dev->event_notifier,
> 1, ec_dev);
> }
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index d6942a6..8dfa7fc 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -150,6 +150,40 @@ int cros_ec_check_result(struct cros_ec_device *ec_dev,
> }
> EXPORT_SYMBOL(cros_ec_check_result);
>
> +/*
> + * cros_ec_get_host_event_wake_mask
> + *
> + * Get the mask of host events that cause wake from suspend.
> + *
> + * @ec_dev: EC device to call
> + * @msg: message structure to use
> + * @mask: result when function returns >=0.
> + *
> + * LOCKING:
> + * the caller has ec_dev->lock mutex, or the caller knows there is
> + * no other command in progress.
> + */
> +static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev,
> + struct cros_ec_command *msg,
> + uint32_t *mask)
> +{
> + struct ec_response_host_event_mask *r;
> + int ret;
> +
> + msg->command = EC_CMD_HOST_EVENT_GET_WAKE_MASK;
> + msg->version = 0;
> + msg->outsize = 0;
> + msg->insize = sizeof(*r);
> +
> + ret = send_command(ec_dev, msg);
> + if (ret > 0) {
> + r = (struct ec_response_host_event_mask *)msg->data;
> + *mask = r->mask;
> + }
> +
> + return ret;
> +}
> +
> static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev,
> int devidx,
> struct cros_ec_command *msg)
> @@ -387,6 +421,15 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
> else
> ec_dev->mkbp_event_supported = 1;
>
> + /*
> + * Get host event wake mask, assume all events are wake events
> + * if unavailable.
> + */
> + ret = cros_ec_get_host_event_wake_mask(ec_dev, proto_msg,
> + &ec_dev->host_event_wake_mask);
> + if (ret < 0)
> + ec_dev->host_event_wake_mask = U32_MAX;
> +
> ret = 0;
>
> exit:
> @@ -504,12 +547,35 @@ static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
> return ec_dev->event_size;
> }
>
> -int cros_ec_get_next_event(struct cros_ec_device *ec_dev)
> +int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event)
> {
> - if (ec_dev->mkbp_event_supported)
> - return get_next_event(ec_dev);
> - else
> - return get_keyboard_state_event(ec_dev);
> + u32 host_event;
> + int ret;
> +
> + if (!ec_dev->mkbp_event_supported) {
> + ret = get_keyboard_state_event(ec_dev);
> + if (ret < 0)
> + return ret;
> +
> + if (wake_event)
> + *wake_event = true;
> +
> + return ret;
> + }
> +
> + ret = get_next_event(ec_dev);
> + if (ret < 0)
> + return ret;
> +
> + if (wake_event) {
> + host_event = cros_ec_get_host_event(ec_dev);
> +
> + /* Consider non-host_event as wake event */
> + *wake_event = !host_event ||
> + !!(host_event & ec_dev->host_event_wake_mask);
> + }
> +
> + return ret;
> }
> EXPORT_SYMBOL(cros_ec_get_next_event);
>
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 2ceb245..bb85325 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -148,6 +148,7 @@ struct cros_ec_device {
>
> struct ec_response_get_next_event event_data;
> int event_size;
> + u32 host_event_wake_mask;
> };
>
> /**
> @@ -294,10 +295,12 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev);
> * cros_ec_get_next_event - Fetch next event from the ChromeOS EC
> *
> * @ec_dev: Device to fetch event from
> + * @wake_event: Pointer to a bool set to true upon return if the event might be
> + * treated as a wake event. Ignored if null.
> *
> * Returns: 0 on success, Linux error number on failure
> */
> -int cros_ec_get_next_event(struct cros_ec_device *ec_dev);
> +int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event);
>
> /**
> * cros_ec_get_host_event - Return a mask of event set by the EC.
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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