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| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2016-10-19 01:34:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-24 19:38:39 +0200 |
| commit | 43605e293eb13c07acb546c14f407a271837af17 (patch) | |
| tree | f23ab78455e2267bdaadb30fe9b29dc14ed06e89 /drivers/misc/mei | |
| parent | 4afb604e2d14d429ac9e1fd84b952602853b2df5 (diff) | |
| download | linux-43605e293eb13c07acb546c14f407a271837af17.tar.gz | |
mei: txe: don't clean an unprocessed interrupt cause.
SEC registers are not accessible when the TXE device is in low power state, hence the SEC interrupt cannot be processed if device is not awake. In some rare cases entrance to low power state (aliveness off) and input ready bits can be signaled at the same time, resulting in communication stall as input ready won't be signaled again after waking up. To resolve this IPC_HHIER_SEC bit in HHISR_REG should not be cleaned if the interrupt is not processed. Cc: stable@vger.kernel.org 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')
| -rw-r--r-- | drivers/misc/mei/hw-txe.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c index e6e5e55a12ed..60415a2bfcbd 100644 --- a/drivers/misc/mei/hw-txe.c +++ b/drivers/misc/mei/hw-txe.c @@ -981,11 +981,13 @@ static bool mei_txe_check_and_ack_intrs(struct mei_device *dev, bool do_ack) hisr = mei_txe_br_reg_read(hw, HISR_REG); aliveness = mei_txe_aliveness_get(dev); - if (hhisr & IPC_HHIER_SEC && aliveness) + if (hhisr & IPC_HHIER_SEC && aliveness) { ipc_isr = mei_txe_sec_reg_read_silent(hw, SEC_IPC_HOST_INT_STATUS_REG); - else + } else { ipc_isr = 0; + hhisr &= ~IPC_HHIER_SEC; + } generated = generated || (hisr & HISR_INT_STS_MSK) || |