This is a note to let you know that I've just added the patch titled usb: xhci: Increase timeout for HC halt to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-xhci-increase-timeout-for-hc-halt.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ca09b1bea63ab83f4cca3a2ae8bc4f597ec28851 Mon Sep 17 00:00:00 2001 From: Maximilian Luz <luzmaximilian@xxxxxxxxx> Date: Wed, 12 May 2021 11:08:15 +0300 Subject: usb: xhci: Increase timeout for HC halt From: Maximilian Luz <luzmaximilian@xxxxxxxxx> commit ca09b1bea63ab83f4cca3a2ae8bc4f597ec28851 upstream. On some devices (specifically the SC8180x based Surface Pro X with QCOM04A6) HC halt / xhci_halt() times out during boot. Manually binding the xhci-hcd driver at some point later does not exhibit this behavior. To work around this, double XHCI_MAX_HALT_USEC, which also resolves this issue. Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Maximilian Luz <luzmaximilian@xxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210512080816.866037-5-mathias.nyman@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci-ext-caps.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/usb/host/xhci-ext-caps.h +++ b/drivers/usb/host/xhci-ext-caps.h @@ -19,8 +19,9 @@ * along with this program; if not, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -/* Up to 16 ms to halt an HC */ -#define XHCI_MAX_HALT_USEC (16*1000) + +/* HC should halt within 16 ms, but use 32 ms as some hosts take longer */ +#define XHCI_MAX_HALT_USEC (32 * 1000) /* HC not running - set to 1 when run/stop bit is cleared. */ #define XHCI_STS_HALT (1<<0) Patches currently in stable-queue which might be from luzmaximilian@xxxxxxxxx are queue-4.9/usb-xhci-increase-timeout-for-hc-halt.patch queue-4.9/pci-pm-do-not-read-power-state-in-pci_enable_device_.patch