From: Ben Dooks <ben-linux@fluff.org>
Date: Mon, 19 Jul 2010 08:40:45 +0000 (+0100)
Subject: USB: s3c-hsotg: Only load packet per fifo write
X-Git-Tag: v2.6.36-rc1~293^2~35
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=03e10e5ab5ba6511ddaf80085cf08c62e9336fa5;p=profile%2Fivi%2Fkernel-x86-ivi.git

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

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>
---

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 4196e37..df6a39d 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -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) {