From f085bd4bfe0907ce2fad2c787fc65871ec5ca6d6 Mon Sep 17 00:00:00 2001 From: Weitao Wango Date: Thu, 24 Mar 2022 20:17:35 +0800 Subject: [PATCH] USB: Fix ehci infinite suspend-resume loop issue in zhaoxin In zhaoxin platform, some ehci projects will latch a wakeup signal internal when plug in a device on port during system S0. This wakeup signal will turn on when ehci runtime suspend, which will trigger a system control interrupt that will resume ehci back to D0. As no device connect, ehci will be set to runtime suspend and turn on the internal latched wakeup signal again. It will cause a suspend-resume loop and generate system control interrupt continuously. Fixed this issue by clear wakeup signal latched in ehci internal when ehci resume callback is called. Acked-by: Alan Stern Signed-off-by: Weitao Wang Link: https://lore.kernel.org/r/20220324121735.3803-1-WeitaoWang-oc@zhaoxin.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-hcd.c | 23 +++++++++++++++++++++++ drivers/usb/host/ehci-pci.c | 4 ++++ drivers/usb/host/ehci.h | 1 + 3 files changed, 28 insertions(+) diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 3d82e0b853be..684164fa9716 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -1103,6 +1103,26 @@ static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev) #ifdef CONFIG_PM +/* Clear wakeup signal locked in zhaoxin platform when device plug in. */ +static void ehci_zx_wakeup_clear(struct ehci_hcd *ehci) +{ + u32 __iomem *reg = &ehci->regs->port_status[4]; + u32 t1 = ehci_readl(ehci, reg); + + t1 &= (u32)~0xf0000; + t1 |= PORT_TEST_FORCE; + ehci_writel(ehci, t1, reg); + t1 = ehci_readl(ehci, reg); + msleep(1); + t1 &= (u32)~0xf0000; + ehci_writel(ehci, t1, reg); + ehci_readl(ehci, reg); + msleep(1); + t1 = ehci_readl(ehci, reg); + ehci_writel(ehci, t1 | PORT_CSC, reg); + ehci_readl(ehci, reg); +} + /* suspend/resume, section 4.3 */ /* These routines handle the generic parts of controller suspend/resume */ @@ -1154,6 +1174,9 @@ int ehci_resume(struct usb_hcd *hcd, bool force_reset) if (ehci->shutdown) return 0; /* Controller is dead */ + if (ehci->zx_wakeup_clear_needed) + ehci_zx_wakeup_clear(ehci); + /* * If CF is still set and reset isn't forced * then we maintained suspend power. diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 638f03b89739..9937c5a7efc2 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -231,6 +231,10 @@ static int ehci_pci_setup(struct usb_hcd *hcd) ehci->is_aspeed = 1; } break; + case PCI_VENDOR_ID_ZHAOXIN: + if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x90) + ehci->zx_wakeup_clear_needed = 1; + break; } /* optional debug port, normally in the first BAR */ diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index fdd073cc053b..ad3f13a3eaf1 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -220,6 +220,7 @@ struct ehci_hcd { /* one per controller */ unsigned imx28_write_fix:1; /* For Freescale i.MX28 */ unsigned spurious_oc:1; unsigned is_aspeed:1; + unsigned zx_wakeup_clear_needed:1; /* required for usb32 quirk */ #define OHCI_CTRL_HCFS (3 << 6)