linux-kernel - [PATCH v4 3/4] misc: rtsx: Cleanup power management ops

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Message-Id: <20220124054743.1800655-3-kai.heng.feng@canonical.com>
Date:   Mon, 24 Jan 2022 13:47:40 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     arnd@...db.de, gregkh@...uxfoundation.org, ulf.hansson@...aro.org
Cc:     linux-pm@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Ricky WU <ricky_wu@...ltek.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/4] misc: rtsx: Cleanup power management ops

- Use cancel_delayed_work_sync to ensure there's no race with
  carddet_work.

- Remove device_wakeup_disable to save some CPU cycles. If the device
  really has ACPI _DSW then the wakeup should be disabled in probe
  routine.

- Remove fetch_vendor_settings from runtime resume routine, since they
  are already saved in "struct rtsx_pcr".

- Move variable assignments to the top of the functions.

Cc: Ricky WU <ricky_wu@...ltek.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v4:
  - Move variable assignments to the top of the functions.

v3:
v2:
 - No change.

 drivers/misc/cardreader/rtsx_pcr.c | 34 ++++++++----------------------
 1 file changed, 9 insertions(+), 25 deletions(-)

diff --git a/drivers/misc/cardreader/rtsx_pcr.c b/drivers/misc/cardreader/rtsx_pcr.c
index f919290f01192..ec395a33faf8b 100644
--- a/drivers/misc/cardreader/rtsx_pcr.c
+++ b/drivers/misc/cardreader/rtsx_pcr.c
@@ -1660,22 +1660,17 @@ static void rtsx_pci_remove(struct pci_dev *pcidev)
 static int __maybe_unused rtsx_pci_suspend(struct device *dev_d)
 {
 	struct pci_dev *pcidev = to_pci_dev(dev_d);
-	struct pcr_handle *handle;
-	struct rtsx_pcr *pcr;
+	struct pcr_handle *handle = pci_get_drvdata(pcidev);
+	struct rtsx_pcr *pcr = handle->pcr;
 
 	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
 
-	handle = pci_get_drvdata(pcidev);
-	pcr = handle->pcr;
-
-	cancel_delayed_work(&pcr->carddet_work);
+	cancel_delayed_work_sync(&pcr->carddet_work);
 
 	mutex_lock(&pcr->pcr_mutex);
 
 	rtsx_pci_power_off(pcr, HOST_ENTER_S3);
 
-	device_wakeup_disable(dev_d);
-
 	mutex_unlock(&pcr->pcr_mutex);
 	return 0;
 }
@@ -1683,15 +1678,12 @@ static int __maybe_unused rtsx_pci_suspend(struct device *dev_d)
 static int __maybe_unused rtsx_pci_resume(struct device *dev_d)
 {
 	struct pci_dev *pcidev = to_pci_dev(dev_d);
-	struct pcr_handle *handle;
-	struct rtsx_pcr *pcr;
+	struct pcr_handle *handle = pci_get_drvdata(pcidev);
+	struct rtsx_pcr *pcr = handle->pcr;
 	int ret = 0;
 
 	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
 
-	handle = pci_get_drvdata(pcidev);
-	pcr = handle->pcr;
-
 	mutex_lock(&pcr->pcr_mutex);
 
 	ret = rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, 0x00);
@@ -1711,13 +1703,11 @@ static int __maybe_unused rtsx_pci_resume(struct device *dev_d)
 
 static void rtsx_pci_shutdown(struct pci_dev *pcidev)
 {
-	struct pcr_handle *handle;
-	struct rtsx_pcr *pcr;
+	struct pcr_handle *handle = pci_get_drvdata(pcidev);
+	struct rtsx_pcr *pcr = handle->pcr;
 
 	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
 
-	handle = pci_get_drvdata(pcidev);
-	pcr = handle->pcr;
 	rtsx_pci_power_off(pcr, HOST_ENTER_S1);
 
 	pci_disable_device(pcidev);
@@ -1756,11 +1746,8 @@ static int rtsx_pci_runtime_idle(struct device *device)
 static int rtsx_pci_runtime_suspend(struct device *device)
 {
 	struct pci_dev *pcidev = to_pci_dev(device);
-	struct pcr_handle *handle;
-	struct rtsx_pcr *pcr;
-
-	handle = pci_get_drvdata(pcidev);
-	pcr = handle->pcr;
+	struct pcr_handle *handle = pci_get_drvdata(pcidev);
+	struct rtsx_pcr *pcr = handle->pcr;
 
 	dev_dbg(device, "--> %s\n", __func__);
 
@@ -1786,9 +1773,6 @@ static int rtsx_pci_runtime_resume(struct device *device)
 
 	rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, 0x00);
 
-	if (pcr->ops->fetch_vendor_settings)
-		pcr->ops->fetch_vendor_settings(pcr);
-
 	rtsx_pci_init_hw(pcr);
 
 	if (pcr->slots[RTSX_SD_CARD].p_dev != NULL) {
-- 
2.33.1