linux-kernel - [PATCH] HID: intel-ish-hid: Replace PCI_DEV_FLAGS_NO_D3 with pci_save

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Date:   Tue,  5 May 2020 21:17:28 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     srinivas.pandruvada@...ux.intel.com
Cc:     rafael.j.wysocki@...el.com,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Zhang Lixu <lixu.zhang@...el.com>, Even Xu <even.xu@...el.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Song Hongyan <hongyan.song@...el.com>,
        linux-input@...r.kernel.org (open list:INTEL INTEGRATED SENSOR HUB
        DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] HID: intel-ish-hid: Replace PCI_DEV_FLAGS_NO_D3 with pci_save_state

PCI_DEV_FLAGS_NO_D3 should not be used outside of PCI core.

Instead, we can use pci_save_state() to hint PCI core that the device
should stay at D0 during suspend.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/hid/intel-ish-hid/ipc/pci-ish.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/intel-ish-hid/ipc/pci-ish.c b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
index f491d8b4e24c..ab588b9c8d09 100644
--- a/drivers/hid/intel-ish-hid/ipc/pci-ish.c
+++ b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
@@ -106,6 +106,11 @@ static inline bool ish_should_enter_d0i3(struct pci_dev *pdev)
 	return !pm_suspend_via_firmware() || pdev->device == CHV_DEVICE_ID;
 }
 
+static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
+{
+	return !pm_resume_via_firmware() || pdev->device == CHV_DEVICE_ID;
+}
+
 /**
  * ish_probe() - PCI driver probe callback
  * @pdev:	pci device
@@ -215,9 +220,7 @@ static void __maybe_unused ish_resume_handler(struct work_struct *work)
 	struct ishtp_device *dev = pci_get_drvdata(pdev);
 	int ret;
 
-	/* Check the NO_D3 flag to distinguish the resume paths */
-	if (pdev->dev_flags & PCI_DEV_FLAGS_NO_D3) {
-		pdev->dev_flags &= ~PCI_DEV_FLAGS_NO_D3;
+	if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag) {
 		disable_irq_wake(pdev->irq);
 
 		ishtp_send_resume(dev);
@@ -281,8 +284,10 @@ static int __maybe_unused ish_suspend(struct device *device)
 			 */
 			ish_disable_dma(dev);
 		} else {
-			/* Set the NO_D3 flag, the ISH would enter D0i3 */
-			pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+			/* Save state so PCI core will keep the device at D0,
+			 * the ISH would enter D0i3
+			 */
+			pci_save_state(pdev);
 
 			enable_irq_wake(pdev->irq);
 		}
-- 
2.17.1