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USB: s3c-hsotg: Only load packet per fifo write

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Limit the IN FIFO write to a single packet per attempt at writing,
as per the specifications and ensure that we don't return fifo-full
so that we can continue writing packets if we have the space.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ben Dooks 2010-07-19 09:40:45 +01:00 committed by Greg Kroah-Hartman
parent 10aebc772a
commit 03e10e5ab5
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/gadget/s3c-hsotg.c
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@ -538,6 +538,17 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
if (can_write > 512)
can_write = 512;
/* limit the write to one max-packet size worth of data, but allow
* the transfer to return that it did not run out of fifo space
* doing it. */
if (to_write > hs_ep->ep.maxpacket) {
to_write = hs_ep->ep.maxpacket;
s3c_hsotg_en_gsint(hsotg,
periodic ? S3C_GINTSTS_PTxFEmp :
S3C_GINTSTS_NPTxFEmp);
}
/* see if we can write data */
if (to_write > can_write) {