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| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2015-06-13 05:51:17 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-14 02:48:02 (GMT) |
| commit | 3dc196eae1db548f05e53e5875ff87b8ff79f249 (patch) | |
| tree | c2727960ff823b0de49ccdc1af0fa939243864da /drivers/misc/mei/mei_dev.h | |
| parent | c241e9b1d9ee7292d708d2298bc87f1455aad0c7 (diff) | |
| download | linux-3dc196eae1db548f05e53e5875ff87b8ff79f249.tar.xz | |
mei: me: wait for power gating exit confirmation
Fix the hbm power gating state machine so it will wait till it receives
confirmation interrupt for the PG_ISOLATION_EXIT message.
In process of the suspend flow the devices first have to exit from the
power gating state (runtime pm resume).
If we do not handle the confirmation interrupt after sending
PG_ISOLATION_EXIT message, we may receive it already after the suspend
flow has changed the device state and interrupt will be interpreted as a
spurious event, consequently link reset will be invoked which will
prevent the device from completing the suspend flow
kernel: [6603] mei_reset:136: mei_me 0000:00:16.0: powering down: end of reset
kernel: [476] mei_me_irq_thread_handler:643: mei_me 0000:00:16.0: function called after ISR to handle the interrupt processing.
kernel: mei_me 0000:00:16.0: FW not ready: resetting
Cc: <stable@vger.kernel.org> #3.18+
Cc: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=86241
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770397
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/mei_dev.h')
| -rw-r--r-- | drivers/misc/mei/mei_dev.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index 70a644f..453f6a3 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -276,6 +276,7 @@ struct mei_cl { * @fw_status : get fw status registers * @pg_state : power gating state of the device + * @pg_in_transition : is device now in pg transition * @pg_is_enabled : is power gating enabled * @intr_clear : clear pending interrupts @@ -305,6 +306,7 @@ struct mei_hw_ops { int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts); enum mei_pg_state (*pg_state)(struct mei_device *dev); + bool (*pg_in_transition)(struct mei_device *dev); bool (*pg_is_enabled)(struct mei_device *dev); void (*intr_clear)(struct mei_device *dev); @@ -349,11 +351,15 @@ struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev, uuid_le uuid); * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete * @MEI_PG_EVENT_RECEIVED: the driver received pg event + * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt + * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt */ enum mei_pg_event { MEI_PG_EVENT_IDLE, MEI_PG_EVENT_WAIT, MEI_PG_EVENT_RECEIVED, + MEI_PG_EVENT_INTR_WAIT, + MEI_PG_EVENT_INTR_RECEIVED, }; /** @@ -670,6 +676,11 @@ static inline enum mei_pg_state mei_pg_state(struct mei_device *dev) return dev->ops->pg_state(dev); } +static inline bool mei_pg_in_transition(struct mei_device *dev) +{ + return dev->ops->pg_in_transition(dev); +} + static inline bool mei_pg_is_enabled(struct mei_device *dev) { return dev->ops->pg_is_enabled(dev); |