diff options
authorAlexander Usyskin <alexander.usyskin@intel.com>2016-10-19 01:34:48 +0300
committerSasha Levin <alexander.levin@verizon.com>2016-11-23 22:49:04 -0500
commitd70f2ee448d4255b63aa2739ce01cb391e602d6b (patch)
parentf596302c66a6100f564ce2ca6d2dafcfe5c79983 (diff)
mei: txe: don't clean an unprocessed interrupt cause.
[ Upstream commit 43605e293eb13c07acb546c14f407a271837af17 ] 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> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index c11a01a1ec21..2e76fd528c70 100644
--- a/drivers/misc/mei/hw-txe.c
+++ b/drivers/misc/mei/hw-txe.c
@@ -973,11 +973,13 @@ 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,
- else
+ } else {
ipc_isr = 0;
+ hhisr &= ~IPC_HHIER_SEC;
+ }
generated = generated ||
(hisr & HISR_INT_STS_MSK) ||