usb: add usb2 Link PM variables to sysfs and usb_device

Adds abitilty to tune L1 timeout (inactivity timer for usb2 link sleep)
and BESL (best effort service latency)via sysfs.

This also adds a new usb2_lpm_parameters structure with those variables to
struct usb_device.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 3d34a0eed088..8be34f838bd4 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3917,7 +3917,7 @@ static int xhci_calculate_usb2_hw_lpm_params(struct usb_device *udev)
         field = le32_to_cpu(udev->bos->ext_cap->bmAttributes);
 
         /* xHCI l1 is set in steps of 256us, xHCI 1.0 section 5.4.11.2 */
-        l1 = XHCI_L1_TIMEOUT / 256;
+        l1 = udev->l1_params.timeout / 256;
 
         /* device has preferred BESLD */
         if (field & USB_BESL_DEEP_VALID) {
@@ -4101,7 +4101,7 @@ int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
                             (field & USB_BESL_BASELINE_VALID))
                                 hird = USB_GET_BESL_BASELINE(field);
                         else
-                                hird = XHCI_DEFAULT_BESL;
+                                hird = udev->l1_params.besl;
 
                         exit_latency = xhci_besl_encoding[hird];
                         spin_unlock_irqrestore(&xhci->lock, flags);
@@ -4191,6 +4191,8 @@ int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
                 if (xhci->hw_lpm_support == 1 &&
                     xhci_check_usb2_port_capability(xhci, portnum, XHCI_HLC)) {
                         udev->usb2_hw_lpm_capable = 1;
+                        udev->l1_params.timeout = XHCI_L1_TIMEOUT;
+                        udev->l1_params.besl = XHCI_DEFAULT_BESL;
                         if (xhci_check_usb2_port_capability(xhci, portnum,
                                                             XHCI_BLC))
                                 udev->usb2_hw_lpm_besl_capable = 1;