linux-kernel - [PATCH v4] usb: ohci-platform: fix usb disconnect issue after s4

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Message-Id: <20220902063639.17875-1-zhuyinbo@loongson.cn>
Date:   Fri,  2 Sep 2022 14:36:39 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <greg@...ah.com>,
        Patchwork Bot <patchwork-bot@...nel.org>
Cc:     zhuyinbo@...ngson.cn
Subject: [PATCH v4] usb: ohci-platform: fix usb disconnect issue after s4

The ohci retaining bogus hardware states cause usb disconnect devices
connected before hibernation(s4), this issue occur when ohci-platform
driver build as a module and the built-in ohci-platform driver will
re probe and re enumerate the devices, so there will be no such problem.

Avoid retaining bogus hardware states during resume-from-hibernation.
Previously we had reset the hardware as part of preparing to reinstate
the snapshot image. But we can do better now with the new PM framework,
since we know exactly which resume operations are from hibernation.

According to the commit 'cd1965db054e ("USB: ohci: move ohci_pci_{
suspend,resume} to ohci-hcd.c")' and commit '6ec4beb5c701 ("USB: new
flag for resume-from-hibernation")', the flag "hibernated" is for
resume-from-hibernation and it should be true when usb resume from disk.

When this flag "hibernated" is set, the drivers will reset the hardware
to get rid of any existing state and make sure resume from hibernation
re-enumerates everything for ohci.

Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
---
Change in v4:
		Add explain what this disconnect issue is.

 drivers/usb/host/ohci-platform.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
index 0adae6265127..822a0f927e62 100644
--- a/drivers/usb/host/ohci-platform.c
+++ b/drivers/usb/host/ohci-platform.c
@@ -289,7 +289,7 @@ static int ohci_platform_suspend(struct device *dev)
 	return ret;
 }
 
-static int ohci_platform_resume(struct device *dev)
+static int ohci_platform_resume_common(struct device *dev, bool hibernated)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
@@ -301,7 +301,7 @@ static int ohci_platform_resume(struct device *dev)
 			return err;
 	}
 
-	ohci_resume(hcd, false);
+	ohci_resume(hcd, hibernated);
 
 	pm_runtime_disable(dev);
 	pm_runtime_set_active(dev);
@@ -309,6 +309,16 @@ static int ohci_platform_resume(struct device *dev)
 
 	return 0;
 }
+
+static int ohci_platform_resume(struct device *dev)
+{
+	return ohci_platform_resume_common(dev, false);
+}
+
+static int ohci_platform_restore(struct device *dev)
+{
+	return ohci_platform_resume_common(dev, true);
+}
 #endif /* CONFIG_PM_SLEEP */
 
 static const struct of_device_id ohci_platform_ids[] = {
@@ -325,8 +335,16 @@ static const struct platform_device_id ohci_platform_table[] = {
 };
 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
 
-static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
-	ohci_platform_resume);
+#ifdef CONFIG_PM_SLEEP
+static const struct dev_pm_ops ohci_platform_pm_ops = {
+	.suspend = ohci_platform_suspend,
+	.resume = ohci_platform_resume,
+	.freeze = ohci_platform_suspend,
+	.thaw = ohci_platform_resume,
+	.poweroff = ohci_platform_suspend,
+	.restore = ohci_platform_restore,
+};
+#endif
 
 static struct platform_driver ohci_platform_driver = {
 	.id_table	= ohci_platform_table,
@@ -335,7 +353,9 @@ static struct platform_driver ohci_platform_driver = {
 	.shutdown	= usb_hcd_platform_shutdown,
 	.driver		= {
 		.name	= "ohci-platform",
+#ifdef CONFIG_PM_SLEEP
 		.pm	= &ohci_platform_pm_ops,
+#endif
 		.of_match_table = ohci_platform_ids,
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	}
-- 
2.31.1