mei: me: wait for power gating exit confirmation

commit 3dc196eae1db548f05e53e5875ff87b8ff79f249 upstream.

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: 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>

4 files changed, 80 insertions, 5 deletions

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index dfbddfe1c7a0..8f639ad4ce6a 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -573,7 +573,7 @@ void mei_host_client_init(struct work_struct *work)
 bool mei_hbuf_acquire(struct mei_device *dev)
 {
 	if (mei_pg_state(dev) == MEI_PG_ON ||
-	    dev->pg_event == MEI_PG_EVENT_WAIT) {
+	    mei_pg_in_transition(dev)) {
 		dev_dbg(dev->dev, "device is in pg\n");
 		return false;
 	}
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index f8fd503dfbd6..19e0cdbd155f 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -629,11 +629,27 @@ int mei_me_pg_unset_sync(struct mei_device *dev)
 	mutex_lock(&dev->device_lock);
 
 reply:
-	if (dev->pg_event == MEI_PG_EVENT_RECEIVED)
-		ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD);
+	if (dev->pg_event != MEI_PG_EVENT_RECEIVED) {
+		ret = -ETIME;
+		goto out;
+	}
+
+	dev->pg_event = MEI_PG_EVENT_INTR_WAIT;
+	ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD);
+	if (ret)
+		return ret;
+
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(dev->wait_pg,
+		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout);
+	mutex_lock(&dev->device_lock);
+
+	if (dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED)
+		ret = 0;
 	else
 		ret = -ETIME;
 
+out:
 	dev->pg_event = MEI_PG_EVENT_IDLE;
 	hw->pg_state = MEI_PG_OFF;
 
@@ -641,6 +657,19 @@ reply:
 }
 
 /**
+ * mei_me_pg_in_transition - is device now in pg transition
+ *
+ * @dev: the device structure
+ *
+ * Return: true if in pg transition, false otherwise
+ */
+static bool mei_me_pg_in_transition(struct mei_device *dev)
+{
+	return dev->pg_event >= MEI_PG_EVENT_WAIT &&
+	       dev->pg_event <= MEI_PG_EVENT_INTR_WAIT;
+}
+
+/**
  * mei_me_pg_is_enabled - detect if PG is supported by HW
  *
  * @dev: the device structure
@@ -672,6 +701,24 @@ notsupported:
 }
 
 /**
+ * mei_me_pg_intr - perform pg processing in interrupt thread handler
+ *
+ * @dev: the device structure
+ */
+static void mei_me_pg_intr(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+
+	if (dev->pg_event != MEI_PG_EVENT_INTR_WAIT)
+		return;
+
+	dev->pg_event = MEI_PG_EVENT_INTR_RECEIVED;
+	hw->pg_state = MEI_PG_OFF;
+	if (waitqueue_active(&dev->wait_pg))
+		wake_up(&dev->wait_pg);
+}
+
+/**
  * mei_me_irq_quick_handler - The ISR of the MEI device
  *
  * @irq: The irq number
@@ -729,6 +776,8 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
 		goto end;
 	}
 
+	mei_me_pg_intr(dev);
+
 	/*  check if we need to start the dev */
 	if (!mei_host_is_ready(dev)) {
 		if (mei_hw_is_ready(dev)) {
@@ -765,9 +814,10 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
 	/*
 	 * During PG handshake only allowed write is the replay to the
 	 * PG exit message, so block calling write function
-	 * if the pg state is not idle
+	 * if the pg event is in PG handshake
 	 */
-	if (dev->pg_event == MEI_PG_EVENT_IDLE) {
+	if (dev->pg_event != MEI_PG_EVENT_WAIT &&
+	    dev->pg_event != MEI_PG_EVENT_RECEIVED) {
 		rets = mei_irq_write_handler(dev, &complete_list);
 		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 	}
@@ -792,6 +842,7 @@ static const struct mei_hw_ops mei_me_hw_ops = {
 	.hw_config = mei_me_hw_config,
 	.hw_start = mei_me_hw_start,
 
+	.pg_in_transition = mei_me_pg_in_transition,
 	.pg_is_enabled = mei_me_pg_is_enabled,
 
 	.intr_clear = mei_me_intr_clear,
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index 618ea721aca8..a106a0c9976c 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,
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 6c6ce9381535..1ae524c2ae67 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -269,6 +269,7 @@ 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
@@ -298,6 +299,7 @@ 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);
@@ -396,11 +398,15 @@ struct mei_cl_device {
  * @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,
 };
 
 /**
@@ -727,6 +733,11 @@ 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);