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xhci: Add ZHAOXIN xHCI host U1/U2 feature support
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> Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Message-ID: <20230602144009.1225632-12-mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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d9b0328d0b
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d5e234ff08
2 changed files with 21 additions and 27 deletions
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@ -523,6 +523,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
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if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) {
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if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) {
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xhci->quirks |= XHCI_ZHAOXIN_HOST;
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xhci->quirks |= XHCI_ZHAOXIN_HOST;
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xhci->quirks |= XHCI_LPM_SUPPORT;
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if (pdev->device == 0x9202) {
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if (pdev->device == 0x9202) {
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xhci->quirks |= XHCI_RESET_ON_RESUME;
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xhci->quirks |= XHCI_RESET_ON_RESUME;
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@ -4605,7 +4605,7 @@ static u16 xhci_calculate_u1_timeout(struct xhci_hcd *xhci,
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}
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}
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}
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}
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if (xhci->quirks & XHCI_INTEL_HOST)
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if (xhci->quirks & (XHCI_INTEL_HOST | XHCI_ZHAOXIN_HOST))
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timeout_ns = xhci_calculate_intel_u1_timeout(udev, desc);
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timeout_ns = xhci_calculate_intel_u1_timeout(udev, desc);
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else
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else
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timeout_ns = udev->u1_params.sel;
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timeout_ns = udev->u1_params.sel;
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@ -4669,7 +4669,7 @@ static u16 xhci_calculate_u2_timeout(struct xhci_hcd *xhci,
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}
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}
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}
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}
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if (xhci->quirks & XHCI_INTEL_HOST)
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if (xhci->quirks & (XHCI_INTEL_HOST | XHCI_ZHAOXIN_HOST))
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timeout_ns = xhci_calculate_intel_u2_timeout(udev, desc);
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timeout_ns = xhci_calculate_intel_u2_timeout(udev, desc);
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else
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else
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timeout_ns = udev->u2_params.sel;
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timeout_ns = udev->u2_params.sel;
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@ -4741,35 +4741,28 @@ static int xhci_update_timeout_for_interface(struct xhci_hcd *xhci,
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return 0;
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return 0;
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}
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}
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static int xhci_check_intel_tier_policy(struct usb_device *udev,
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enum usb3_link_state state)
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{
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struct usb_device *parent;
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unsigned int num_hubs;
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/* Don't enable U1 if the device is on a 2nd tier hub or lower. */
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for (parent = udev->parent, num_hubs = 0; parent->parent;
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parent = parent->parent)
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num_hubs++;
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if (num_hubs < 2)
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return 0;
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dev_dbg(&udev->dev, "Disabling U1/U2 link state for device"
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" below second-tier hub.\n");
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dev_dbg(&udev->dev, "Plug device into first-tier hub "
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"to decrease power consumption.\n");
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return -E2BIG;
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}
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static int xhci_check_tier_policy(struct xhci_hcd *xhci,
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static int xhci_check_tier_policy(struct xhci_hcd *xhci,
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struct usb_device *udev,
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struct usb_device *udev,
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enum usb3_link_state state)
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enum usb3_link_state state)
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{
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{
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if (xhci->quirks & XHCI_INTEL_HOST)
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struct usb_device *parent = udev->parent;
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return xhci_check_intel_tier_policy(udev, state);
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int tier = 1; /* roothub is tier1 */
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else
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while (parent) {
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parent = parent->parent;
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tier++;
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}
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if (xhci->quirks & XHCI_INTEL_HOST && tier > 3)
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goto fail;
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if (xhci->quirks & XHCI_ZHAOXIN_HOST && tier > 2)
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goto fail;
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return 0;
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return 0;
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fail:
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dev_dbg(&udev->dev, "Tier policy prevents U1/U2 LPM states for devices at tier %d\n",
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tier);
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return -E2BIG;
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}
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}
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/* Returns the U1 or U2 timeout that should be enabled.
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/* Returns the U1 or U2 timeout that should be enabled.
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