Commit 700b4173 authored by Andiry Xu's avatar Andiry Xu Committed by Sarah Sharp
Browse files

xHCI 1.0: TT_THINK_TIME set 



xHCI 1.0 spec says the TT Think Time field shall be set to zero if the device
is not a High-speed hub.

Signed-off-by: default avatarAndiry Xu <andiry.xu@amd.com>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
parent ad106f29

drivers/usb/host/xhci.c

+6 −1
Original line number Diff line number Diff line
@@ -2699,11 +2699,16 @@ int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev, 
		/* Set TT think time - convert from ns to FS bit times.

		 * 0 = 8 FS bit times, 1 = 16 FS bit times,

		 * 2 = 24 FS bit times, 3 = 32 FS bit times.

		 *

		 * xHCI 1.0: this field shall be 0 if the device is not a

		 * High-spped hub.

		 */

		think_time = tt->think_time;

		if (think_time != 0)

			think_time = (think_time / 666) - 1;

		slot_ctx->tt_info |= cpu_to_le32(TT_THINK_TIME(think_time));

		if (xhci->hci_version < 0x100 || hdev->speed == USB_SPEED_HIGH)

			slot_ctx->tt_info |=

				cpu_to_le32(TT_THINK_TIME(think_time));

	} else {

		xhci_dbg(xhci, "xHCI version %x doesn't need hub "

				"TT think time or number of ports\n",