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linux/include/uapi
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Felipe Balbi 3b5a43dad0 usb: add helper to extract bits 12:11 of wMaxPacketSize 
commit 541b6fe630 upstream.

According to USB Specification 2.0 table 9-4,
wMaxPacketSize is a bitfield. Endpoint's maxpacket
is laid out in bits 10:0. For high-speed,
high-bandwidth isochronous endpoints, bits 12:11
contain a multiplier to tell us how many
transactions we want to try per uframe.

This means that if we want an isochronous endpoint
to issue 3 transfers of 1024 bytes per uframe,
wMaxPacketSize should contain the value:

	1024 | (2 << 11)

or 5120 (0x1400). In order to make Host and
Peripheral controller drivers' life easier, we're
adding a helper which returns bits 12:11. Note that
no care is made WRT to checking endpoint type and
gadget's speed. That's left for drivers to handle.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2017-03-16 02:26:17 +00:00
..
asm-generic asm-generic: Add renameat2 syscall 2014-05-20 10:59:38 +02:00
drm xdrm/i915: Use two 32bit reads for select 64bit REG_READ ioctls 2015-08-11 09:57:37 +01:00
linux usb: add helper to extract bits 12:11 of wMaxPacketSize 2017-03-16 02:26:17 +00:00
mtd mtd: lpddr: add driver for LPDDR2-NVM PCM memories 2014-05-20 17:45:17 -07:00
rdma RDMA/uapi: Include socket.h in rdma_user_cm.h 2014-09-17 09:22:17 -07:00
scsi FCoE Updates for 3.9 2013-03-01 09:10:08 +00:00
sound ALSA: compress: fix the struct alignment to 4 bytes 2014-06-23 12:15:33 +02:00
video UAPI: (Scripted) Disintegrate include/video 2012-12-20 17:14:26 +00:00
xen xen: install xen/gntdev.h and xen/gntalloc.h 2014-02-11 10:12:36 -05:00
Kbuild UAPI: (Scripted) Set up UAPI Kbuild files 2012-10-02 18:01:35 +01:00