[PATCH v2 2/3] HID: intel-ish-hid: ipc: make ish suspend paths clear

[Zhang Lixu <lixu.zhang@intel.com>]

For suspend-to-idle, send suspend message and set N0_D3 flag to put
the ISH into D0i3 state.
For suspend-to-mem, disable the DMA bit before ISH entering D3, and
NO_D3 flag is cleared by default, then the ISH would enter D3.

Signed-off-by: Zhang Lixu <lixu.zhang@intel.com>
---
 drivers/hid/intel-ish-hid/ipc/pci-ish.c | 52 +++++++++++++++----------
 1 file changed, 31 insertions(+), 21 deletions(-)

diff --git a/drivers/hid/intel-ish-hid/ipc/pci-ish.c b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
index 89b14d2edd0b..35081f2cf781 100644
--- a/drivers/hid/intel-ish-hid/ipc/pci-ish.c
+++ b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
@@ -223,6 +223,8 @@ static void __maybe_unused ish_resume_handler(struct work_struct *work)
 	 * it means ISH isn't powered off, in this case, send a resume message.
 	 */
 	if (fwsts >= FWSTS_SENSOR_APP_LOADED) {
+		disable_irq_wake(pdev->irq);
+
 		ishtp_send_resume(dev);
 
 		/* Waiting to get resume response */
@@ -255,27 +257,36 @@ static int __maybe_unused ish_suspend(struct device *device)
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct ishtp_device *dev = pci_get_drvdata(pdev);
 
-	enable_irq_wake(pdev->irq);
-	/*
-	 * If previous suspend hasn't been asnwered then ISH is likely dead,
-	 * don't attempt nested notification
-	 */
-	if (dev->suspend_flag)
-		return	0;
-
-	dev->resume_flag = 0;
-	dev->suspend_flag = 1;
-	ishtp_send_suspend(dev);
-
-	/* 25 ms should be enough for live ISH to flush all IPC buf */
-	if (dev->suspend_flag)
-		wait_event_interruptible_timeout(dev->suspend_wait,
-						 !dev->suspend_flag,
-						  msecs_to_jiffies(25));
-
 	if (ish_should_enter_d0i3(pdev)) {
-		/* Set the NO_D3 flag, the ISH would enter D0i3 */
-		pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+		/*
+		 * If previous suspend hasn't been asnwered then ISH is likely
+		 * dead, don't attempt nested notification
+		 */
+		if (dev->suspend_flag)
+			return	0;
+
+		dev->resume_flag = 0;
+		dev->suspend_flag = 1;
+		ishtp_send_suspend(dev);
+
+		/* 25 ms should be enough for live ISH to flush all IPC buf */
+		if (dev->suspend_flag)
+			wait_event_interruptible_timeout(dev->suspend_wait,
+					!dev->suspend_flag,
+					msecs_to_jiffies(25));
+
+		if (dev->suspend_flag) {
+			/*
+			 * It looks like FW halt, clear the DMA bit, and put
+			 * ISH into D3, and FW would reset on resume.
+			 */
+			ish_disable_dma(dev);
+		} else {
+			/* Set the NO_D3 flag, the ISH would enter D0i3 */
+			pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+
+			enable_irq_wake(pdev->irq);
+		}
 	} else {
 		/*
 		 * Clear the DMA bit before putting ISH into D3,
@@ -304,7 +315,6 @@ static int __maybe_unused ish_resume(struct device *device)
 	ish_resume_device = device;
 	dev->resume_flag = 1;
 
-	disable_irq_wake(pdev->irq);
 	schedule_work(&resume_work);
 
 	return 0;
-- 
2.17.1