Hi all,
This series enables support for eUSB2 Double Isochronous IN Bandwidth UVC
devices specified in 'USB 2.0 Double Isochronous IN Bandwidth' ECN. In
short, it adds support for new integrated USB2 webcams that can send twice
the data compared to conventional USB2 webcams.
These devices are identified by the device descriptor bcdUSB 0x0220 value.
They have an additional eUSB2 Isochronous Endpoint Companion Descriptor,
and a zero max packet size in regular isoc endpoint descriptor. Support
for parsing that new descriptor was added in commit
c749f058b437 ("USB: core: Add eUSB2 descriptor and parsing in USB core")
This series adds support to UVC, USB core, and xHCI to identify eUSB2
double isoc devices, and allow and set proper max packet, iso frame desc
sizes, bytes per interval, and other values in URBs and xHCI endpoint
contexts needed to support the double data rates for eUSB2 double isoc
devices.
v1 can be found here
<URL:https://lore.kernel.org/linux-usb/20250616093730.2569328-2-mathias.nyman@xxxxxxxxxxxxxxx/>.
v2 can be found here
<URL:https://lore.kernel.org/linux-usb/20250711083413.1552423-1-sakari.ailus@xxxxxxxxxxxxxxx/>.
v3 can be found here
<URL:https://lore.kernel.org/linux-usb/20250807055355.1257029-1-sakari.ailus@xxxxxxxxxxxxxxx/>.
since v3:
- Use spaces in aligning macro body for HCC2_EUSB2_DIC() (1st patch).
- Move usb_endpoint_max_isoc_bpi() to drivers/usb/core/usb.c (3rd patch).
since v2:
- Use ep->eusb2_isoc_ep_comp.bDescriptorType to determined whether the
eUSB2 isochronous endpoint companion descriptor exists.
- Clean up eUSB2 double isoc bw maxp calculation.
- Drop le16_to_cpu(udev->descriptor.bcdUSB) == 0x220 check from
xhci_eusb2_is_isoc_bw_double() -- it's redundant as
ep->eusb2_isoc_ep_comp.dwBytesPerInterval will be zero otherwise.
- Add kernel-doc documentation for usb_endpoint_max_isoc_bpi().
- Check the endpoint has IN direction in usb_endpoint_max_isoc_bpi() and
usb_submit_urb() as a condition for eUSB2 isoc double bw.
since v1:
- Introduce uvc_endpoint_max_isoc_bpi() to obtain maximum bytes per
interval value for an endpoint, in a new patch (3rd). This code has been
slightly reworked from the instance in the UVC driver, including support
for SuperSpeedPlus Isochronous Endpoint Companion.
- Use usb_endpoint_max_isoc_bpi() in the UVC driver instead of open-coding
eUSB2 support there, also drop now-redundant uvc_endpoint_max_bpi().
- Use u32 for maximum bpi and related information in the UVC driver -- the
value could be larger than a 16-bit type can hold.
- Assume max in usb_submit_urb() is a natural number as
usb_endpoint_maxp() returns only natural numbers (2nd patch).
Rai, Amardeep (3):
xhci: Add host support for eUSB2 double isochronous bandwidth devices
USB: core: support eUSB2 double bandwidth large isoc URB frames
USB: Add a function to obtain USB version independent maximum bpi
value
Tao Q Tao (1):
media: uvcvideo: eUSB2 double isochronous bandwidth support
drivers/media/usb/uvc/uvc_driver.c | 4 +-
drivers/media/usb/uvc/uvc_video.c | 24 ++----------
drivers/media/usb/uvc/uvcvideo.h | 4 +-
drivers/usb/core/urb.c | 17 +++++++--
drivers/usb/core/usb.c | 32 ++++++++++++++++
drivers/usb/host/xhci-caps.h | 2 +
drivers/usb/host/xhci-mem.c | 60 ++++++++++++++++++++++++------
drivers/usb/host/xhci-ring.c | 6 +--
drivers/usb/host/xhci.c | 16 +++++++-
drivers/usb/host/xhci.h | 19 ++++++++++
include/linux/usb.h | 3 ++
11 files changed, 141 insertions(+), 46 deletions(-)
--
2.39.5
