mei: abstract host and device readieness

Add mei_host_set_ready function to enable the device
and is_ready function to query the host and me readiness
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/hw-me.c

@@ -172,6 +172,39 @@ void mei_hw_reset(struct mei_device *dev, bool intr_enable)
 	dev_dbg(&dev->pdev->dev, "current HCSR = 0x%08x.\n", hcsr);
 }
 
+/**
+ * mei_host_set_ready - enable device
+ *
+ * @dev - mei device
+ * returns bool
+ */
+
+void mei_host_set_ready(struct mei_device *dev)
+{
+	dev->host_hw_state |= H_IE | H_IG | H_RDY;
+	mei_hcsr_set(dev);
+}
+/**
+ * mei_host_is_ready - check whether the host has turned ready
+ *
+ * @dev - mei device
+ * returns bool
+ */
+bool mei_host_is_ready(struct mei_device *dev)
+{
+	return (dev->host_hw_state & H_RDY) == H_RDY;
+}
+
+/**
+ * mei_me_is_ready - check whether the me has turned ready
+ *
+ * @dev - mei device
+ * returns bool
+ */
+bool mei_me_is_ready(struct mei_device *dev)
+{
+	return (dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA;
+}
 
 /**
  * mei_interrupt_quick_handler - The ISR of the MEI device
@@ -290,7 +323,7 @@ int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *header,
 	dev->host_hw_state |= H_IG;
 	mei_hcsr_set(dev);
 	dev->me_hw_state = mei_mecsr_read(dev);
-	if ((dev->me_hw_state & ME_RDY_HRA) != ME_RDY_HRA)
+	if (!mei_me_is_ready(dev))
 		return -EIO;
 
 	return 0;

drivers/misc/mei/init.c

@@ -131,18 +131,18 @@ int mei_hw_init(struct mei_device *dev)
 		goto out;
 	}
 
-	if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
-	      ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
+	if (!(mei_host_is_ready(dev) && mei_me_is_ready(dev))) {
 		dev->dev_state = MEI_DEV_DISABLED;
+
 		dev_dbg(&dev->pdev->dev,
 			"host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 			dev->host_hw_state, dev->me_hw_state);
 
-		if (!(dev->host_hw_state & H_RDY))
-			dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");
+		if (!mei_host_is_ready(dev))
+			dev_dbg(&dev->pdev->dev, "host is not ready.\n");
 
-		if (!(dev->me_hw_state & ME_RDY_HRA))
-			dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");
+		if (!mei_me_is_ready(dev))
+			dev_dbg(&dev->pdev->dev, "ME is not ready.\n");
 
 		dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
 		ret = -ENODEV;
@@ -159,9 +159,7 @@ int mei_hw_init(struct mei_device *dev)
 	dev->recvd_msg = false;
 	dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 	    dev->host_hw_state, dev->me_hw_state);
-	dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
 	dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
-	dev_dbg(&dev->pdev->dev, "MEI  start success.\n");
 	ret = 0;
 
 out:

drivers/misc/mei/interrupt.c

@@ -700,7 +700,7 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
 	dev->me_hw_state = mei_mecsr_read(dev);
 
 	/* check if ME wants a reset */
-	if ((dev->me_hw_state & ME_RDY_HRA) == 0 &&
+	if (!mei_me_is_ready(dev) &&
 	    dev->dev_state != MEI_DEV_RESETING &&
 	    dev->dev_state != MEI_DEV_INITIALIZING) {
 		dev_dbg(&dev->pdev->dev, "FW not ready.\n");
@@ -711,16 +711,17 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
 
 	dev->host_hw_state = mei_hcsr_read(dev);
 	/*  check if we need to start the dev */
-	if ((dev->host_hw_state & H_RDY) == 0) {
-		if ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA) {
+	if (!mei_host_is_ready(dev)) {
+		if (mei_me_is_ready(dev)) {
 			dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
-			dev->host_hw_state |= (H_IE | H_IG | H_RDY);
-			mei_hcsr_set(dev);
-			dev->dev_state = MEI_DEV_INIT_CLIENTS;
+
+			mei_host_set_ready(dev);
+
 			dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
-			/* link is established
-			 * start sending messages.
-			 */
+			/* link is established * start sending messages.  */
+
+			dev->dev_state = MEI_DEV_INIT_CLIENTS;
+
 			mei_hbm_start_req(dev);
 			mutex_unlock(&dev->device_lock);
 			return IRQ_HANDLED;

drivers/misc/mei/mei_dev.h

@@ -396,6 +396,10 @@ void mei_clear_interrupts(struct mei_device *dev);
 void mei_enable_interrupts(struct mei_device *dev);
 void mei_disable_interrupts(struct mei_device *dev);
 
+void mei_host_set_ready(struct mei_device *dev);
+bool mei_host_is_ready(struct mei_device *dev);
+bool mei_me_is_ready(struct mei_device *dev);
+
 
 
 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"