6.6-stable review patch. If anyone has any objections, please let me know.
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From: Kuangyi Chiang ki.chiang65@gmail.com
[ Upstream commit 76d98856b1c6d06ce18f32c20527a4f9d283e660 ]
Sometimes the hub driver does not recognize the USB device connected to the external USB2.0 hub when the system resumes from S4.
After the SetPortFeature(PORT_RESET) request is completed, the hub driver calls the HCD reset_device callback, which will issue a Reset Device command and free all structures associated with endpoints that were disabled.
This happens when the xHCI driver issue a Reset Device command to inform the Etron xHCI host that the USB device associated with a device slot has been reset. Seems that the Etron xHCI host can not perform this command correctly, affecting the USB device.
To work around this, the xHCI driver should obtain a new device slot with reference to commit 651aaf36a7d7 ("usb: xhci: Handle USB transaction error on address command"), which is another way to inform the Etron xHCI host that the USB device has been reset.
Add a new XHCI_ETRON_HOST quirk flag to invoke the workaround in xhci_discover_or_reset_device().
Fixes: 2a8f82c4ceaf ("USB: xhci: Notify the xHC when a device is reset.") Cc: stable@vger.kernel.org Signed-off-by: Kuangyi Chiang ki.chiang65@gmail.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20241106101459.775897-19-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/host/xhci-pci.c | 1 + drivers/usb/host/xhci.c | 19 +++++++++++++++++++ drivers/usb/host/xhci.h | 1 + 3 files changed, 21 insertions(+)
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index d36158df83afc..340d9597d1ab0 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -458,6 +458,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci) if (pdev->vendor == PCI_VENDOR_ID_ETRON && (pdev->device == PCI_DEVICE_ID_EJ168 || pdev->device == PCI_DEVICE_ID_EJ188)) { + xhci->quirks |= XHCI_ETRON_HOST; xhci->quirks |= XHCI_RESET_ON_RESUME; xhci->quirks |= XHCI_BROKEN_STREAMS; } diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index f005ce1f91ca2..3bd70e6ad64ba 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -3642,6 +3642,8 @@ void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci, xhci->num_active_eps); }
+static void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev); + /* * This submits a Reset Device Command, which will set the device state to 0, * set the device address to 0, and disable all the endpoints except the default @@ -3712,6 +3714,23 @@ static int xhci_discover_or_reset_device(struct usb_hcd *hcd, SLOT_STATE_DISABLED) return 0;
+ if (xhci->quirks & XHCI_ETRON_HOST) { + /* + * Obtaining a new device slot to inform the xHCI host that + * the USB device has been reset. + */ + ret = xhci_disable_slot(xhci, udev->slot_id); + xhci_free_virt_device(xhci, udev->slot_id); + if (!ret) { + ret = xhci_alloc_dev(hcd, udev); + if (ret == 1) + ret = 0; + else + ret = -EINVAL; + } + return ret; + } + trace_xhci_discover_or_reset_device(slot_ctx);
xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id); diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index a0005a1124938..4bbd12db7239a 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1660,6 +1660,7 @@ struct xhci_hcd { #define XHCI_ZHAOXIN_HOST BIT_ULL(46) #define XHCI_WRITE_64_HI_LO BIT_ULL(47) #define XHCI_CDNS_SCTX_QUIRK BIT_ULL(48) +#define XHCI_ETRON_HOST BIT_ULL(49)
unsigned int num_active_eps; unsigned int limit_active_eps;