Add U1/U2 feature support of xHCI for zhaoxin.

Since both Intel and Zhaoxin need to check the tier where the device is located to determine whether to enabled U1/U2, remove the previous Intel U1/U2 tier policy and add common policy in xhci_check_tier_policy. If vendor has specific U1/U2 enable policy,quirks can be add to declare.

Suggested-by: Mathias Nyman mathias.nyman@linux.intel.com Cc: stable@vger.kernel.org Signed-off-by: Weitao Wang WeitaoWang-oc@zhaoxin.com --- drivers/usb/host/xhci.c | 43 +++++++++++++++++------------------------ 1 file changed, 18 insertions(+), 25 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 78790dc13c5f..cae57f0207a4 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4604,7 +4604,7 @@ static u16 xhci_calculate_u1_timeout(struct xhci_hcd *xhci, } }

- if (xhci->quirks & XHCI_INTEL_HOST) + if (xhci->quirks & (XHCI_INTEL_HOST | XHCI_ZHAOXIN_HOST)) timeout_ns = xhci_calculate_intel_u1_timeout(udev, desc); else timeout_ns = udev->u1_params.sel; @@ -4668,7 +4668,7 @@ static u16 xhci_calculate_u2_timeout(struct xhci_hcd *xhci, } }

- if (xhci->quirks & XHCI_INTEL_HOST) + if (xhci->quirks & (XHCI_INTEL_HOST | XHCI_ZHAOXIN_HOST)) timeout_ns = xhci_calculate_intel_u2_timeout(udev, desc); else timeout_ns = udev->u2_params.sel; @@ -4740,37 +4740,30 @@ static int xhci_update_timeout_for_interface(struct xhci_hcd *xhci, return 0; }

-static int xhci_check_intel_tier_policy(struct usb_device *udev, +static int xhci_check_tier_policy(struct xhci_hcd *xhci, + struct usb_device *udev, enum usb3_link_state state) { - struct usb_device *parent; - unsigned int num_hubs; + struct usb_device *parent = udev->parent; + int tier = 1; /* roothub is tier1 */

- /* Don't enable U1 if the device is on a 2nd tier hub or lower. */ - for (parent = udev->parent, num_hubs = 0; parent->parent; - parent = parent->parent) - num_hubs++; + while (parent) { + parent = parent->parent; + tier++; + }

- if (num_hubs < 2) - return 0; + if (xhci->quirks & XHCI_INTEL_HOST && tier > 3) + goto fail; + if (xhci->quirks & XHCI_ZHAOXIN_HOST && tier > 2) + goto fail;

- dev_dbg(&udev->dev, "Disabling U1/U2 link state for device" - " below second-tier hub.\n"); - dev_dbg(&udev->dev, "Plug device into first-tier hub " - "to decrease power consumption.\n"); + return 0; +fail: + dev_dbg(&udev->dev, "Tier policy prevents U1/U2 LPM states for devices at tier %d\n", + tier); return -E2BIG; }

-static int xhci_check_tier_policy(struct xhci_hcd *xhci, - struct usb_device *udev, - enum usb3_link_state state) -{ - if (xhci->quirks & XHCI_INTEL_HOST) - return xhci_check_intel_tier_policy(udev, state); - else - return 0; -} - /* Returns the U1 or U2 timeout that should be enabled. * If the tier check or timeout setting functions return with a non-zero exit * code, that means the timeout value has been finalized and we shouldn't look