Hi Sarah,
While going through the code for Handling Transfer Events
(drivers/usb/host/xhci-ring.c), i hit upon this problem.
As defined in "drivers/usb/host/xhci.h"
/* Normal TRB fields */
/* transfer_len bitmasks - bits 0:16 */
#define TRB_LEN(p) ((p) & 0x1ffff)
And the same macro i could see being used while Handling Trasfer
events "handle_tx_event()", and further in
process_ctrl_td(), process_isoc_td(), and process_bulk_intr_td().
However, as per XHCI specs (Rev 1.0, 5/21/10) section 6.4.2.1 for
Transfer event TRBs, the transfer length is bits 0:23
thereby something like below could be valid:
/* Transfer event TRB length bit mask */
/* bits 0:23 */
#define EVENT_TRB_LEN(p) ((p) & 0xffffff)
This difference is confusing somewhat.
I hope the current code must be pretty much fine, and there could be
something that i might be stupidly missing.
Would you please help me understand this .
Thanks,
--
Best Regards
Vivek
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