linux-kernel - [PATCH v2 08/12] fbdev: cyber2000fb: use generic power management

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Message-Id: <20200810185723.15540-9-vaibhavgupta40@gmail.com>
Date:   Tue, 11 Aug 2020 00:27:19 +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>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Paul Mackerras <paulus@...ba.org>,
        Russell King <linux@...linux.org.uk>,
        Andres Salomon <dilinger@...ued.net>,
        Antonino Daplas <adaplas@...il.com>
Cc:     Vaibhav Gupta <vaibhavgupta40@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-geode@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: [PATCH v2 08/12] fbdev: cyber2000fb: use generic power management

Drivers should do only device-specific jobs. But in general, drivers using
legacy PCI PM framework for .suspend()/.resume() have to manage many PCI
PM-related tasks themselves which can be done by PCI Core itself. This
brings extra load on the driver and it directly calls PCI helper functions
to handle them.

Although the cyber2000fb driver does not have that extra load, we should
switch to the new generic framework by updating function signatures and
define a "struct dev_pm_ops" variable to bind PM callbacks so that we can
remove the legacy .suspend & .resume bindings.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
---
 drivers/video/fbdev/cyber2000fb.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/cyber2000fb.c b/drivers/video/fbdev/cyber2000fb.c
index 42d37bed518a..d45355b9a58c 100644
--- a/drivers/video/fbdev/cyber2000fb.c
+++ b/drivers/video/fbdev/cyber2000fb.c
@@ -1810,7 +1810,7 @@ static void cyberpro_pci_remove(struct pci_dev *dev)
 	}
 }
 
-static int cyberpro_pci_suspend(struct pci_dev *dev, pm_message_t state)
+static int __maybe_unused cyberpro_pci_suspend(struct device *dev)
 {
 	return 0;
 }
@@ -1818,9 +1818,9 @@ static int cyberpro_pci_suspend(struct pci_dev *dev, pm_message_t state)
 /*
  * Re-initialise the CyberPro hardware
  */
-static int cyberpro_pci_resume(struct pci_dev *dev)
+static int __maybe_unused cyberpro_pci_resume(struct device *dev)
 {
-	struct cfb_info *cfb = pci_get_drvdata(dev);
+	struct cfb_info *cfb = dev_get_drvdata(dev);
 
 	if (cfb) {
 		cyberpro_pci_enable_mmio(cfb);
@@ -1846,12 +1846,15 @@ static struct pci_device_id cyberpro_pci_table[] = {
 
 MODULE_DEVICE_TABLE(pci, cyberpro_pci_table);
 
+static SIMPLE_DEV_PM_OPS(cyberpro_pci_pm_ops,
+			 cyberpro_pci_suspend,
+			 cyberpro_pci_resume);
+
 static struct pci_driver cyberpro_driver = {
 	.name		= "CyberPro",
 	.probe		= cyberpro_pci_probe,
 	.remove		= cyberpro_pci_remove,
-	.suspend	= cyberpro_pci_suspend,
-	.resume		= cyberpro_pci_resume,
+	.driver.pm	= &cyberpro_pci_pm_ops,
 	.id_table	= cyberpro_pci_table
 };
 
-- 
2.27.0