From mboxrd@z Thu Jan 1 00:00:00 1970 From: ben-linux@fluff.org (Ben Dooks) Date: Fri, 11 Jun 2010 09:20:53 +0100 Subject: [PATCH 07/11] USB: s3c-hsotg: Only load packet per fifo write In-Reply-To: <1276244457-4072-1-git-send-email-ben-linux@fluff.org> References: <1276244457-4072-1-git-send-email-ben-linux@fluff.org> Message-ID: <1276244457-4072-8-git-send-email-ben-linux@fluff.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- drivers/usb/gadget/s3c-hsotg.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 819e75a..7c35bfe 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -539,6 +539,17 @@ 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) { -- 1.7.0.4