On Tue, Mar 05, 2013 at 05:13:54PM +0800, Peter Chen wrote:
> On Fri, Mar 01, 2013 at 03:42:27PM +0100, Michael Grzeschik wrote:
> > This patch removes the limitation of having a limited amount of only
> > four active tds on one endpoint. We use the linked list implementation
> > to manage all tds which get added and removed by hardware_{en,de}queue.
> >
> > Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
> > ---
> > drivers/usb/chipidea/udc.c | 79 ++++++++++++++++++++++++++++++++------------
> > 1 file changed, 58 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> > index 98433cd..58efa49 100644
> > --- a/drivers/usb/chipidea/udc.c
> > +++ b/drivers/usb/chipidea/udc.c
> > @@ -415,7 +415,9 @@ static void setup_td_bits(struct td_node *tdnode, unsigned length)
> >
> > static int add_td_to_list(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq, unsigned length)
> > {
> > + int i;
> > struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node), GFP_ATOMIC);
> > + u32 temp;
> >
> > if (node == NULL)
> > return -ENOMEM;
> > @@ -429,6 +431,15 @@ static int add_td_to_list(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq, unsi
> >
> > setup_td_bits(node, length);
> >
> > + temp = (u32) (mReq->req.dma + mReq->req.actual);
> > + if (length) {
> > + node->ptr->page[0] = temp;
> > + for (i = 1; i <= TD_COUNT; i++)
> > + node->ptr->page[i] = (temp + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
> > + }
> > +
> > + mReq->req.actual += length;
> > +
> > /* get the last entry */
> > lastnode = list_entry(mReq->tds.prev,
> > struct td_node, td);
> > @@ -454,6 +465,7 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
> > int ret = 0;
> > unsigned length = mReq->req.length;
> > struct td_node *reqnode, *lastnode;
> > + unsigned reqnodesize = min(length, (unsigned)(TD_COUNT * CI13XXX_PAGE_SIZE));
> >
> > /* don't queue twice */
> > if (mReq->req.status == -EALREADY)
> > @@ -468,13 +480,25 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
> > reqnode = list_first_entry(&mReq->tds,
> > struct td_node, td);
> >
> > - setup_td_bits(reqnode, length);
> > + setup_td_bits(reqnode, reqnodesize);
> >
> > reqnode->ptr->page[0] = mReq->req.dma;
> > for (i = 1; i <= TD_COUNT; i++)
> > reqnode->ptr->page[i] =
> > (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
> >
> > + mReq->req.actual += reqnodesize;
> > +
> > + if (length > TD_COUNT * CI13XXX_PAGE_SIZE) {
> > + int rest = length - mReq->req.actual;
> > + while (rest > 0) {
> > + unsigned count = min(length - mReq->req.actual,
> > + (unsigned)(TD_COUNT * CI13XXX_PAGE_SIZE));
>
> You can use rest instead of "length - mReq->req.actual".
Yes, i will fix.
> > + add_td_to_list(mEp, mReq, count);
> > + rest -= TD_COUNT * CI13XXX_PAGE_SIZE;
> > + }
> > + }
> > +
> > if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0))
> > add_td_to_list(mEp, mReq, 0);
> >
> > @@ -485,6 +509,7 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
> > if (!mReq->req.no_interrupt)
> > lastnode->ptr->token |= TD_IOC;
> >
> > + mReq->req.actual = 0;
>
> Any reasons to do it here? The ep_queue will do it later.
No it was doing it before calling hardware_enqueue. So i change it back
here. That indeed seems like we misuse this variable in that code.
I will fix this.
> > @@ -532,6 +557,8 @@ done:
> > static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
[snip]
> > - mReq->req.actual = node_first->ptr->token & TD_TOTAL_BYTES;
> > - mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
> > - mReq->req.actual = mReq->req.length - mReq->req.actual;
> > + mReq->req.actual = actual;
>
> If the mReq->req.actual will be changed at below line, any reasons to do it?
Correct, will remove that.
> > mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
I will fix that to:
mReq->req.actual = mReq->req.status ? 0 : actual;
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