usb: dwc3: gadget: Account for max size in TRB space

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The current calculation takes dep->trb_dequeue - dep->trb_enqueue to
find the TRB space left.

If you enqueue 1, that results in:
(u8) 0 - (u8) 1 = 0xff = 255 TRBs left.

This is correct if DWC3_TRB_NUM == 256.

If DWC3_TRB_NUM is less than 256 (but still a power of 2) you need to
mod the result by DWC3_TRB_NUM.

For example the same calculation with DWC3_TRB_NUM = 8, results in:
255 % 6 = 7 TRBs left.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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This commit is contained in:

John Youn 2016-05-19 17:26:12 -07:00 • committed by Felipe Balbi

parent 89bc856e5a

commit 32db3d9437

1 changed files with 5 additions and 1 deletions

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drivers/usb/dwc3/gadget.c

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