Commit 29d99b96 authored by Shawn Nematbakhsh's avatar Shawn Nematbakhsh Committed by Benson Leung

cros_ec: Don't signal wake event for non-wake host events

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: default avatarShawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: default avatarThierry Escande <thierry.escande@collabora.com>
Acked-for-MFD-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarBenson Leung <bleung@chromium.org>
parent d4da97e5
......@@ -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);
......@@ -221,7 +228,7 @@ 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);
}
......
......@@ -231,7 +231,8 @@ static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
{
struct cros_ec_device *ec_dev = data;
if (ec_dev->mkbp_event_supported && cros_ec_get_next_event(ec_dev) > 0)
if (ec_dev->mkbp_event_supported &&
cros_ec_get_next_event(ec_dev, NULL) > 0)
blocking_notifier_call_chain(&ec_dev->event_notifier, 0,
ec_dev);
}
......
......@@ -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);
......
......@@ -149,6 +149,7 @@ struct cros_ec_device {
struct ec_response_get_next_event event_data;
int event_size;
u32 host_event_wake_mask;
};
/**
......@@ -299,10 +300,12 @@ 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.
......
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