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| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2015-06-13 08:51:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-14 05:48:02 +0300 |
| commit | 3dc196eae1db548f05e53e5875ff87b8ff79f249 (patch) | |
| tree | c2727960ff823b0de49ccdc1af0fa939243864da /drivers/misc/mei/hw-txe.c | |
| 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/hw-txe.c')
| -rw-r--r-- | drivers/misc/mei/hw-txe.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c index 1cd223c96864..bae680c648ff 100644 --- a/drivers/misc/mei/hw-txe.c +++ b/drivers/misc/mei/hw-txe.c @@ -302,6 +302,18 @@ int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req) } /** + * mei_txe_pg_in_transition - is device now in pg transition + * + * @dev: the device structure + * + * Return: true if in pg transition, false otherwise + */ +static bool mei_txe_pg_in_transition(struct mei_device *dev) +{ + return dev->pg_event == MEI_PG_EVENT_WAIT; +} + +/** * mei_txe_pg_is_enabled - detect if PG is supported by HW * * @dev: the device structure @@ -1138,6 +1150,7 @@ static const struct mei_hw_ops mei_txe_hw_ops = { .hw_config = mei_txe_hw_config, .hw_start = mei_txe_hw_start, + .pg_in_transition = mei_txe_pg_in_transition, .pg_is_enabled = mei_txe_pg_is_enabled, .intr_clear = mei_txe_intr_clear, |