The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
9d5333c93134 ("usb: cdns3: host: fix endless superspeed hub port reset") 88171f67a2c1 ("usb: cdns3: Removes xhci_cdns3_suspend_quirk from host-export.h") 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver") e93e58d27402 ("usb: cdnsp: Device side header file for CDNSP driver") 0b490046d8d7 ("usb: cdns3: Refactoring names in reusable code") 394c3a144de8 ("usb: cdns3: Moves reusable code to separate module") f738957277ba ("usb: cdns3: Split core.c into cdns3-plat and core.c file") db8892bb1bb6 ("usb: cdns3: Add support for DRD CDNSP") d2a968dddf98 ("Merge tag 'usb-v5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-next")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 9d5333c931347005352d5b8beaa43528c94cfc9c Mon Sep 17 00:00:00 2001 From: Li Jun jun.li@nxp.com Date: Wed, 26 Oct 2022 15:07:49 -0400 Subject: [PATCH] usb: cdns3: host: fix endless superspeed hub port reset
When usb 3.0 hub connect with one USB 2.0 device and NO USB 3.0 device, some usb hub reports endless port reset message.
[ 190.324169] usb 2-1: new SuperSpeed USB device number 88 using xhci-hcd [ 190.352834] hub 2-1:1.0: USB hub found [ 190.356995] hub 2-1:1.0: 4 ports detected [ 190.700056] usb 2-1: USB disconnect, device number 88 [ 192.472139] usb 2-1: new SuperSpeed USB device number 89 using xhci-hcd [ 192.500820] hub 2-1:1.0: USB hub found [ 192.504977] hub 2-1:1.0: 4 ports detected [ 192.852066] usb 2-1: USB disconnect, device number 89
The reason is the runtime pm state of USB2.0 port is active and USB 3.0 port is suspend, so parent device is active state.
cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/usb2/power/runtime_status
suspended
cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/usb1/power/runtime_status
active
cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/power/runtime_status
active
cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/power/runtime_status
active
So xhci_cdns3_suspend_quirk() have not called. U3 configure is not applied.
move U3 configure into host start. Reinit again in resume function in case controller power lost during suspend.
Cc: stable@vger.kernel.org 5.10 Signed-off-by: Li Jun jun.li@nxp.com Signed-off-by: Frank Li Frank.Li@nxp.com Reviewed-by: Peter Chen peter.chen@kernel.org Acked-by: Alexander Stein alexander.stein@ew.tq-group.com Link: https://lore.kernel.org/r/20221026190749.2280367-1-Frank.Li@nxp.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c index 9643b905e2d8..6164fc4c96a4 100644 --- a/drivers/usb/cdns3/host.c +++ b/drivers/usb/cdns3/host.c @@ -24,11 +24,37 @@ #define CFG_RXDET_P3_EN BIT(15) #define LPM_2_STB_SWITCH_EN BIT(25)
-static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd); +static void xhci_cdns3_plat_start(struct usb_hcd *hcd) +{ + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + u32 value; + + /* set usbcmd.EU3S */ + value = readl(&xhci->op_regs->command); + value |= CMD_PM_INDEX; + writel(value, &xhci->op_regs->command); + + if (hcd->regs) { + value = readl(hcd->regs + XECP_AUX_CTRL_REG1); + value |= CFG_RXDET_P3_EN; + writel(value, hcd->regs + XECP_AUX_CTRL_REG1); + + value = readl(hcd->regs + XECP_PORT_CAP_REG); + value |= LPM_2_STB_SWITCH_EN; + writel(value, hcd->regs + XECP_PORT_CAP_REG); + } +} + +static int xhci_cdns3_resume_quirk(struct usb_hcd *hcd) +{ + xhci_cdns3_plat_start(hcd); + return 0; +}
static const struct xhci_plat_priv xhci_plat_cdns3_xhci = { .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI, - .suspend_quirk = xhci_cdns3_suspend_quirk, + .plat_start = xhci_cdns3_plat_start, + .resume_quirk = xhci_cdns3_resume_quirk, };
static int __cdns_host_init(struct cdns *cdns) @@ -90,32 +116,6 @@ static int __cdns_host_init(struct cdns *cdns) return ret; }
-static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd) -{ - struct xhci_hcd *xhci = hcd_to_xhci(hcd); - u32 value; - - if (pm_runtime_status_suspended(hcd->self.controller)) - return 0; - - /* set usbcmd.EU3S */ - value = readl(&xhci->op_regs->command); - value |= CMD_PM_INDEX; - writel(value, &xhci->op_regs->command); - - if (hcd->regs) { - value = readl(hcd->regs + XECP_AUX_CTRL_REG1); - value |= CFG_RXDET_P3_EN; - writel(value, hcd->regs + XECP_AUX_CTRL_REG1); - - value = readl(hcd->regs + XECP_PORT_CAP_REG); - value |= LPM_2_STB_SWITCH_EN; - writel(value, hcd->regs + XECP_PORT_CAP_REG); - } - - return 0; -} - static void cdns_host_exit(struct cdns *cdns) { kfree(cdns->xhci_plat_data);