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From: Vaibhav Gupta <vaibhavgupta40@gmail.com>
To: Bjorn Helgaas <helgaas@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Bjorn Helgaas <bjorn@helgaas.com>,
	Vaibhav Gupta <vaibhav.varodek@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	linux-i2c@vger.kernel.org,
	Vaibhav Gupta <vaibhavgupta40@gmail.com>
Subject: [Linux-kernel-mentees] [PATCH v1] i2c: eg20t: use generic power management
Date: Mon, 20 Jul 2020 19:30:32 +0530	[thread overview]
Message-ID: <20200720140031.511830-1-vaibhavgupta40@gmail.com> (raw)

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_enable_wake() and pci_set_power_state() 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@gmail.com>
---
 drivers/i2c/busses/i2c-eg20t.c | 39 ++++++++--------------------------
 1 file changed, 9 insertions(+), 30 deletions(-)

diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 73f139690e4e..c0ddc4cc2ce7 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -846,11 +846,10 @@ static void pch_i2c_remove(struct pci_dev *pdev)
 	kfree(adap_info);
 }
 
-#ifdef CONFIG_PM
-static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused pch_i2c_suspend(struct device *dev)
 {
-	int ret;
 	int i;
+	struct pci_dev *pdev = to_pci_dev(dev);
 	struct adapter_info *adap_info = pci_get_drvdata(pdev);
 	void __iomem *p = adap_info->pch_data[0].pch_base_address;
 
@@ -872,34 +871,17 @@ static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state)
 		ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA),
 		ioread32(p + PCH_I2CESRSTA));
 
-	ret = pci_save_state(pdev);
-
-	if (ret) {
-		pch_pci_err(pdev, "pci_save_state\n");
-		return ret;
-	}
-
-	pci_enable_wake(pdev, PCI_D3hot, 0);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	device_wakeup_disable(dev);
 
 	return 0;
 }
 
-static int pch_i2c_resume(struct pci_dev *pdev)
+static int __maybe_unused pch_i2c_resume(struct device *dev)
 {
 	int i;
-	struct adapter_info *adap_info = pci_get_drvdata(pdev);
-
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
+	struct adapter_info *adap_info = dev_get_drvdata(dev);
 
-	if (pci_enable_device(pdev) < 0) {
-		pch_pci_err(pdev, "pch_i2c_resume:pci_enable_device FAILED\n");
-		return -EIO;
-	}
-
-	pci_enable_wake(pdev, PCI_D3hot, 0);
+	device_wakeup_disable(dev);
 
 	for (i = 0; i < adap_info->ch_num; i++)
 		pch_i2c_init(&adap_info->pch_data[i]);
@@ -908,18 +890,15 @@ static int pch_i2c_resume(struct pci_dev *pdev)
 
 	return 0;
 }
-#else
-#define pch_i2c_suspend NULL
-#define pch_i2c_resume NULL
-#endif
+
+static SIMPLE_DEV_PM_OPS(pch_i2c_pm_ops, pch_i2c_suspend, pch_i2c_resume);
 
 static struct pci_driver pch_pcidriver = {
 	.name = KBUILD_MODNAME,
 	.id_table = pch_pcidev_id,
 	.probe = pch_i2c_probe,
 	.remove = pch_i2c_remove,
-	.suspend = pch_i2c_suspend,
-	.resume = pch_i2c_resume
+	.driver.pm = &pch_i2c_pm_ops,
 };
 
 module_pci_driver(pch_pcidriver);
-- 
2.27.0

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             reply	other threads:[~2020-07-20 14:03 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20 14:00 Vaibhav Gupta [this message]
2020-08-05  9:16 ` [Linux-kernel-mentees] [PATCH v1] i2c: eg20t: use generic power management Wolfram Sang
2020-08-05 15:23 ` Bjorn Helgaas
2020-08-05 15:28   ` Bjorn Helgaas
2020-08-05 16:21     ` Vaibhav Gupta
2020-08-05 16:56       ` Bjorn Helgaas
2020-08-05 17:19         ` Vaibhav Gupta
2020-08-05 19:36         ` [Linux-kernel-mentees] [PATCH v2 0/2] i2c: eg20t: Power management upgrade and clean-ups Vaibhav Gupta
2020-08-05 19:36           ` [Linux-kernel-mentees] [PATCH v2 1/2] i2c: eg20t: Drop PCI wakeup calls from .suspend/.resume Vaibhav Gupta
2020-08-10 14:01             ` Wolfram Sang
2020-08-05 19:36           ` [Linux-kernel-mentees] [PATCH v2 2/2] i2c: eg20t: use generic power management Vaibhav Gupta
2020-08-07 20:23             ` Bjorn Helgaas
2020-08-10  9:18               ` Vaibhav Gupta
2020-08-25  9:53               ` Jean Delvare
2020-08-25 15:16                 ` Bjorn Helgaas
2020-08-10 14:01             ` Wolfram Sang

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