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authorVaibhav Gupta <vaibhavgupta40@gmail.com>2020-08-20 00:26:54 +0530
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2020-09-08 13:33:20 +0200
commita91df118990083a47ab644f8ef63f17eeae4b1ad (patch)
tree6df0af35a4498ebd53198d08b9b3aa210b59f4e1
parentfb6e2db899e7483a5fb47a94cf03bd6d03e8bbe6 (diff)
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fbdev: arkfb: 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. Switch to the new generic framework by updating function signatures and define a "struct dev_pm_ops" variable to bind PM callbacks. Also, remove unnecessary calls to the PCI Helper functions along with the legacy .suspend & .resume bindings. The ark_pci_suspend() is not designed to function in the case of Freeze. Thus, the code checked for "if (state.event == PM_EVENT_FREEZE....)". This is because, in the legacy framework, this callback was invoked even in the event of Freeze. Hence, added the load of unnecessary function-call. The goal can be achieved by binding the callback with only ".suspend" and ".poweroff" in the "ark_pci_pm_ops" const variable. This also avoids the step of checking "state.event == PM_EVENT_FREEZE" every time the callback is invoked. Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com> Cc: Bjorn Helgaas <helgaas@kernel.org> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Bjorn Helgaas <bjorn@helgaas.com> Cc: Vaibhav Gupta <vaibhav.varodek@gmail.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Andres Salomon <dilinger@queued.net> CC: Antonino Daplas <adaplas@gmail.com> Cc: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200819185654.151170-13-vaibhavgupta40@gmail.com
-rw-r--r--drivers/video/fbdev/arkfb.c41
1 files changed, 17 insertions, 24 deletions
diff --git a/drivers/video/fbdev/arkfb.c b/drivers/video/fbdev/arkfb.c
index 11ab9a153860..edf169d0816e 100644
--- a/drivers/video/fbdev/arkfb.c
+++ b/drivers/video/fbdev/arkfb.c
@@ -1085,12 +1085,11 @@ static void ark_pci_remove(struct pci_dev *dev)
}
-#ifdef CONFIG_PM
/* PCI suspend */
-static int ark_pci_suspend (struct pci_dev* dev, pm_message_t state)
+static int __maybe_unused ark_pci_suspend(struct device *dev)
{
- struct fb_info *info = pci_get_drvdata(dev);
+ struct fb_info *info = dev_get_drvdata(dev);
struct arkfb_info *par = info->par;
dev_info(info->device, "suspend\n");
@@ -1098,7 +1097,7 @@ static int ark_pci_suspend (struct pci_dev* dev, pm_message_t state)
console_lock();
mutex_lock(&(par->open_lock));
- if ((state.event == PM_EVENT_FREEZE) || (par->ref_count == 0)) {
+ if (par->ref_count == 0) {
mutex_unlock(&(par->open_lock));
console_unlock();
return 0;
@@ -1106,10 +1105,6 @@ static int ark_pci_suspend (struct pci_dev* dev, pm_message_t state)
fb_set_suspend(info, 1);
- pci_save_state(dev);
- pci_disable_device(dev);
- pci_set_power_state(dev, pci_choose_state(dev, state));
-
mutex_unlock(&(par->open_lock));
console_unlock();
@@ -1119,9 +1114,9 @@ static int ark_pci_suspend (struct pci_dev* dev, pm_message_t state)
/* PCI resume */
-static int ark_pci_resume (struct pci_dev* dev)
+static int __maybe_unused ark_pci_resume(struct device *dev)
{
- struct fb_info *info = pci_get_drvdata(dev);
+ struct fb_info *info = dev_get_drvdata(dev);
struct arkfb_info *par = info->par;
dev_info(info->device, "resume\n");
@@ -1132,14 +1127,6 @@ static int ark_pci_resume (struct pci_dev* dev)
if (par->ref_count == 0)
goto fail;
- pci_set_power_state(dev, PCI_D0);
- pci_restore_state(dev);
-
- if (pci_enable_device(dev))
- goto fail;
-
- pci_set_master(dev);
-
arkfb_set_par(info);
fb_set_suspend(info, 0);
@@ -1148,10 +1135,17 @@ fail:
console_unlock();
return 0;
}
-#else
-#define ark_pci_suspend NULL
-#define ark_pci_resume NULL
-#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops ark_pci_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+ .suspend = ark_pci_suspend,
+ .resume = ark_pci_resume,
+ .freeze = NULL,
+ .thaw = ark_pci_resume,
+ .poweroff = ark_pci_suspend,
+ .restore = ark_pci_resume,
+#endif
+};
/* List of boards that we are trying to support */
@@ -1168,8 +1162,7 @@ static struct pci_driver arkfb_pci_driver = {
.id_table = ark_devices,
.probe = ark_pci_probe,
.remove = ark_pci_remove,
- .suspend = ark_pci_suspend,
- .resume = ark_pci_resume,
+ .driver.pm = &ark_pci_pm_ops,
};
/* Cleanup */