This is a note to let you know that I've just added the patch titled

xhci: Fix front USB ports on ASUS PRIME B350M-A

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: xhci-fix-front-usb-ports-on-asus-prime-b350m-a.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 191edc5e2e515aab1075a3f0ef23599e80be5f59 Mon Sep 17 00:00:00 2001

From: Kai-Heng Feng kai.heng.feng@canonical.com Date: Thu, 8 Mar 2018 17:17:17 +0200 Subject: xhci: Fix front USB ports on ASUS PRIME B350M-A

From: Kai-Heng Feng kai.heng.feng@canonical.com

commit 191edc5e2e515aab1075a3f0ef23599e80be5f59 upstream.

When a USB device gets plugged on ASUS PRIME B350M-A's front ports, the xHC stops working: [ 549.114587] xhci_hcd 0000:02:00.0: WARN: xHC CMD_RUN timeout [ 549.114608] suspend_common(): xhci_pci_suspend+0x0/0xc0 returns -110 [ 549.114638] xhci_hcd 0000:02:00.0: can't suspend (hcd_pci_runtime_suspend returned -110)

Delay before running xHC command CMD_RUN can workaround the issue.

Use a new quirk to make the delay only targets to the affected xHC.

Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/usb/host/xhci-pci.c | 3 +++ drivers/usb/host/xhci.c | 3 +++ drivers/usb/host/xhci.h | 1 + 3 files changed, 7 insertions(+)

--- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -134,6 +134,9 @@ static void xhci_pci_quirks(struct devic if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info()) xhci->quirks |= XHCI_AMD_PLL_FIX;

+ if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x43bb) + xhci->quirks |= XHCI_SUSPEND_DELAY; + if (pdev->vendor == PCI_VENDOR_ID_AMD) xhci->quirks |= XHCI_TRUST_TX_LENGTH;

--- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -887,6 +887,9 @@ int xhci_suspend(struct xhci_hcd *xhci, clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); del_timer_sync(&xhci->shared_hcd->rh_timer);

+ if (xhci->quirks & XHCI_SUSPEND_DELAY) + usleep_range(1000, 1500); + spin_lock_irq(&xhci->lock); clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1830,6 +1830,7 @@ struct xhci_hcd { #define XHCI_LIMIT_ENDPOINT_INTERVAL_7 (1 << 26) /* Reserved. It was XHCI_U2_DISABLE_WAKE */ #define XHCI_ASMEDIA_MODIFY_FLOWCONTROL (1 << 28) +#define XHCI_SUSPEND_DELAY (1 << 30)

unsigned int num_active_eps; unsigned int limit_active_eps;

Patches currently in stable-queue which might be from kai.heng.feng@canonical.com are

queue-4.14/xhci-fix-front-usb-ports-on-asus-prime-b350m-a.patch