diff options
| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2025-08-20 17:38:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-06 15:25:05 +0200 |
| commit | d6725169a9bbcb5bd1dd14b2891b874614c59f52 (patch) | |
| tree | ed9a83aa5266a79df81259cbb29ce66ddd6bc745 /drivers/usb/core | |
| parent | 24b8762e05ed8203dc0b76b62c802aadd487e9aa (diff) | |
usb: core: Introduce usb_endpoint_is_hs_isoc_double()
Introduce usb_endpoint_is_hs_isoc_double() tell whether an endpoint
conforms to USB 2.0 Isochronous Double IN Bandwidth ECN.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250820143824.551777-7-sakari.ailus@linux.intel.com
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/usb.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index ca9ff6ad8e73..939dc4aafb89 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -1139,6 +1139,25 @@ u32 usb_endpoint_max_periodic_payload(struct usb_device *udev, } EXPORT_SYMBOL_GPL(usb_endpoint_max_periodic_payload); +/** + * usb_endpoint_is_hs_isoc_double - Tell whether an endpoint uses USB 2 + * Isochronous Double IN Bandwidth + * @udev: The USB device + * @ep: The endpoint + * + * Returns: true if an endpoint @ep conforms to USB 2 Isochronous Double IN + * Bandwidth ECN, false otherwise. + */ +bool usb_endpoint_is_hs_isoc_double(struct usb_device *udev, + const struct usb_host_endpoint *ep) +{ + return ep->eusb2_isoc_ep_comp.bDescriptorType && + le16_to_cpu(udev->descriptor.bcdUSB) == 0x220 && + usb_endpoint_is_isoc_in(&ep->desc) && + !le16_to_cpu(ep->desc.wMaxPacketSize); +} +EXPORT_SYMBOL_GPL(usb_endpoint_is_hs_isoc_double); + /* * Notifications of device and interface registration */ |