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usb: gadget: Introduce frame_number to usb_request 

Add a field frame_number to the usb_request to report the interval
number in (micro)frames in which the isochronous transfer was
transmitted or received. The gadget driver can use this knowledge to
synchronize with the host. Also, this option is useful for debugging
purposes.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
hifive-unleashed-5.1
Thinh Nguyen 2018-11-15 19:03:21 -08:00 committed by Felipe Balbi
parent d54d334e75
commit 6b69753fa0
1 changed files with 4 additions and 0 deletions
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4
include/linux/usb/gadget.h
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@ -61,6 +61,8 @@ struct usb_ep;
* invalidated by the error may first be dequeued.
* @context: For use by the completion callback
* @list: For use by the gadget driver.
* @frame_number: Reports the interval number in (micro)frame in which the
* isochronous transfer was transmitted or received.
* @status: Reports completion code, zero or a negative errno.
* Normally, faults block the transfer queue from advancing until
* the completion callback returns.
@ -112,6 +114,8 @@ struct usb_request {
void *context;
struct list_head list;
unsigned frame_number; /* ISO ONLY */
int status;
unsigned actual;
};