Hi,
Peter Chen <peter.chen@xxxxxxx> writes:
> For sg buffer list use case, we need to add ISP for each TRB, and
> add CHAIN bit for each TRB except for the last TRB.
>
> Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
> ---
> drivers/usb/cdns3/gadget.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
> index 25e3ff1cdf61..a308a694abc5 100644
> --- a/drivers/usb/cdns3/gadget.c
> +++ b/drivers/usb/cdns3/gadget.c
> @@ -1221,8 +1221,14 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
> else
> priv_req->trb->control = cpu_to_le32(control);
>
> - if (sg_supported)
> + if (sg_supported) {
> + trb->control |= TRB_ISP;
> + /* Don't set chain bit for last TRB */
> + if (sg_iter < num_trb - 1)
> + trb->control |= TRB_CHAIN;
> +
> s = sg_next(s);
> + }
is this a bugfix?
--
balbi
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