linux-kernel - [PATCH v1] memstick: jmb38x_ms: use generic power management

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Message-Id: <20200720111625.306681-1-vaibhavgupta40@gmail.com>
Date:   Mon, 20 Jul 2020 16:46:26 +0530
From:   Vaibhav Gupta <vaibhavgupta40@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <bjorn@...gaas.com>,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        Maxim Levitsky <maximlevitsky@...il.com>,
        Alex Dubov <oakad@...oo.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Vaibhav Gupta <vaibhavgupta40@...il.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-mmc@...r.kernel.org
Subject: [PATCH v1] memstick: jmb38x_ms: use generic power management

Drivers using legacy PM have to manage PCI states and device's PM states
themselves. They also need to take care of configuration registers.

With improved and powerful support of generic PM, PCI Core takes care of
above mentioned, device-independent, jobs.

This driver makes use of PCI helper functions like
pci_save/restore_state(), pci_enable/disable_device(),
pci_set_power_state() and pci_set_master() to do required operations. In
generic mode, they are no longer needed.

Change function parameter in both .suspend() and .resume() to
"struct device*" type. Use to_pci_dev() and dev_get_drvdata() to get
"struct pci_dev*" variable and drv data.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
---
 drivers/memstick/host/jmb38x_ms.c | 38 +++++++++----------------------
 1 file changed, 11 insertions(+), 27 deletions(-)

diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
index 0a9c5ddf2f59..2aa9592917d9 100644
--- a/drivers/memstick/host/jmb38x_ms.c
+++ b/drivers/memstick/host/jmb38x_ms.c
@@ -793,11 +793,10 @@ static int jmb38x_ms_pmos(struct pci_dev *pdev, int flag)
         return 0;
 }
 
-#ifdef CONFIG_PM
-
-static int jmb38x_ms_suspend(struct pci_dev *dev, pm_message_t state)
+static int __maybe_unused jmb38x_ms_suspend(struct device *dev)
 {
-	struct jmb38x_ms *jm = pci_get_drvdata(dev);
+	struct jmb38x_ms *jm = dev_get_drvdata(dev);
+
 	int cnt;
 
 	for (cnt = 0; cnt < jm->host_cnt; ++cnt) {
@@ -806,26 +805,17 @@ static int jmb38x_ms_suspend(struct pci_dev *dev, pm_message_t state)
 		memstick_suspend_host(jm->hosts[cnt]);
 	}
 
-	pci_save_state(dev);
-	pci_enable_wake(dev, pci_choose_state(dev, state), 0);
-	pci_disable_device(dev);
-	pci_set_power_state(dev, pci_choose_state(dev, state));
+	device_wakeup_disable(dev);
+
 	return 0;
 }
 
-static int jmb38x_ms_resume(struct pci_dev *dev)
+static int __maybe_unused jmb38x_ms_resume(struct device *dev)
 {
-	struct jmb38x_ms *jm = pci_get_drvdata(dev);
+	struct jmb38x_ms *jm = dev_get_drvdata(dev);
 	int rc;
 
-	pci_set_power_state(dev, PCI_D0);
-	pci_restore_state(dev);
-	rc = pci_enable_device(dev);
-	if (rc)
-		return rc;
-	pci_set_master(dev);
-
-	jmb38x_ms_pmos(dev, 1);
+	jmb38x_ms_pmos(to_pci_dev(dev), 1);
 
 	for (rc = 0; rc < jm->host_cnt; ++rc) {
 		if (!jm->hosts[rc])
@@ -837,13 +827,6 @@ static int jmb38x_ms_resume(struct pci_dev *dev)
 	return 0;
 }
 
-#else
-
-#define jmb38x_ms_suspend NULL
-#define jmb38x_ms_resume NULL
-
-#endif /* CONFIG_PM */
-
 static int jmb38x_ms_count_slots(struct pci_dev *pdev)
 {
 	int cnt, rc = 0;
@@ -1030,13 +1013,14 @@ static struct pci_device_id jmb38x_ms_id_tbl [] = {
 	{ }
 };
 
+static SIMPLE_DEV_PM_OPS(jmb38x_ms_pm_ops, jmb38x_ms_suspend, jmb38x_ms_resume);
+
 static struct pci_driver jmb38x_ms_driver = {
 	.name = DRIVER_NAME,
 	.id_table = jmb38x_ms_id_tbl,
 	.probe = jmb38x_ms_probe,
 	.remove = jmb38x_ms_remove,
-	.suspend = jmb38x_ms_suspend,
-	.resume = jmb38x_ms_resume
+	.driver.pm = &jmb38x_ms_pm_ops,
 };
 
 module_pci_driver(jmb38x_ms_driver);
-- 
2.27.0