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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>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Paul Mackerras <paulus@samba.org>,
        Russell King <linux@armlinux.org.uk>,
        Andres Salomon <dilinger@queued.net>,
        Antonino Daplas <adaplas@gmail.com>,
        Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc:     Vaibhav Gupta <vaibhavgupta40@gmail.com>,
        dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-geode@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        Shuah Khan <skhan@linuxfoundation.org>
Subject: [PATCH v1 04/12] fbdev: aty: use generic power management
Date:   Wed,  5 Aug 2020 23:37:14 +0530
Message-Id: <20200805180722.244008-5-vaibhavgupta40@gmail.com>
In-Reply-To: <20200805180722.244008-1-vaibhavgupta40@gmail.com>
References: <20200805180722.244008-1-vaibhavgupta40@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Drivers using legacy power management .suspen()/.resume() callbacks
have to manage PCI states and device's PM states themselves. They also
need to take care of standard configuration registers.

Switch to generic power management framework using a single
"struct dev_pm_ops" variable to take the unnecessary load from the driver.
This also avoids the need for the driver to directly call most of the PCI
helper functions and device power state control functions, as through
the generic framework PCI Core takes care of the necessary operations,
and drivers are required to do only device-specific jobs.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/video/fbdev/aty/atyfb_base.c | 50 ++++++++++++++++++++--------
 1 file changed, 36 insertions(+), 14 deletions(-)

diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index b0ac895e5ac9..a24d5bf6ade1 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -132,8 +132,8 @@
 #define PRINTKI(fmt, args...)	printk(KERN_INFO "atyfb: " fmt, ## args)
 #define PRINTKE(fmt, args...)	printk(KERN_ERR "atyfb: " fmt, ## args)
 
-#if defined(CONFIG_PM) || defined(CONFIG_PMAC_BACKLIGHT) || \
-defined (CONFIG_FB_ATY_GENERIC_LCD) || defined(CONFIG_FB_ATY_BACKLIGHT)
+#if defined(CONFIG_PMAC_BACKLIGHT) || defined(CONFIG_FB_ATY_GENERIC_LCD) || \
+defined(CONFIG_FB_ATY_BACKLIGHT)
 static const u32 lt_lcd_regs[] = {
 	CNFG_PANEL_LG,
 	LCD_GEN_CNTL_LG,
@@ -175,7 +175,7 @@ u32 aty_ld_lcd(int index, const struct atyfb_par *par)
 		return aty_ld_le32(LCD_DATA, par);
 	}
 }
-#endif /* defined(CONFIG_PM) || defined(CONFIG_PMAC_BACKLIGHT) || defined (CONFIG_FB_ATY_GENERIC_LCD) */
+#endif /* defined(CONFIG_PMAC_BACKLIGHT) || defined (CONFIG_FB_ATY_GENERIC_LCD) */
 
 #ifdef CONFIG_FB_ATY_GENERIC_LCD
 /*
@@ -1994,7 +1994,7 @@ static int atyfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 
 
 
-#if defined(CONFIG_PM) && defined(CONFIG_PCI)
+#if defined(CONFIG_PCI)
 
 #ifdef CONFIG_PPC_PMAC
 /* Power management routines. Those are used for PowerBook sleep.
@@ -2055,8 +2055,9 @@ static int aty_power_mgmt(int sleep, struct atyfb_par *par)
 }
 #endif /* CONFIG_PPC_PMAC */
 
-static int atyfb_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+static int atyfb_pci_suspend_late(struct device *dev, pm_message_t state)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
 	struct fb_info *info = pci_get_drvdata(pdev);
 	struct atyfb_par *par = (struct atyfb_par *) info->par;
 
@@ -2082,7 +2083,6 @@ static int atyfb_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	 * first save the config space content so the core can
 	 * restore it properly on resume.
 	 */
-	pci_save_state(pdev);
 
 #ifdef CONFIG_PPC_PMAC
 	/* Set chip to "suspend" mode */
@@ -2094,8 +2094,6 @@ static int atyfb_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 		console_unlock();
 		return -EIO;
 	}
-#else
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
 #endif
 
 	console_unlock();
@@ -2105,6 +2103,21 @@ static int atyfb_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	return 0;
 }
 
+static int __maybe_unused atyfb_pci_suspend(struct device *dev)
+{
+	return atyfb_pci_suspend_late(dev, PMSG_SUSPEND);
+}
+
+static int __maybe_unused atyfb_pci_hibernate(struct device *dev)
+{
+	return atyfb_pci_suspend_late(dev, PMSG_HIBERNATE);
+}
+
+static int __maybe_unused atyfb_pci_freeze(struct device *dev)
+{
+	return atyfb_pci_suspend_late(dev, PMSG_FREEZE);
+}
+
 static void aty_resume_chip(struct fb_info *info)
 {
 	struct atyfb_par *par = info->par;
@@ -2119,8 +2132,9 @@ static void aty_resume_chip(struct fb_info *info)
 			aty_ld_le32(BUS_CNTL, par) | BUS_APER_REG_DIS, par);
 }
 
-static int atyfb_pci_resume(struct pci_dev *pdev)
+static int __maybe_unused atyfb_pci_resume(struct device *dev)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
 	struct fb_info *info = pci_get_drvdata(pdev);
 	struct atyfb_par *par = (struct atyfb_par *) info->par;
 
@@ -2162,7 +2176,18 @@ static int atyfb_pci_resume(struct pci_dev *pdev)
 	return 0;
 }
 
-#endif /*  defined(CONFIG_PM) && defined(CONFIG_PCI) */
+static const struct dev_pm_ops atyfb_pci_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= atyfb_pci_suspend,
+	.resume		= atyfb_pci_resume,
+	.freeze		= atyfb_pci_freeze,
+	.thaw		= atyfb_pci_resume,
+	.poweroff	= atyfb_pci_hibernate,
+	.restore	= atyfb_pci_resume,
+#endif /* CONFIG_PM_SLEEP */
+};
+
+#endif /*  defined(CONFIG_PCI) */
 
 /* Backlight */
 #ifdef CONFIG_FB_ATY_BACKLIGHT
@@ -3801,10 +3826,7 @@ static struct pci_driver atyfb_driver = {
 	.id_table	= atyfb_pci_tbl,
 	.probe		= atyfb_pci_probe,
 	.remove		= atyfb_pci_remove,
-#ifdef CONFIG_PM
-	.suspend	= atyfb_pci_suspend,
-	.resume		= atyfb_pci_resume,
-#endif /* CONFIG_PM */
+	.driver.pm	= &atyfb_pci_pm_ops,
 };
 
 #endif /* CONFIG_PCI */
-- 
2.27.0