diff options
Diffstat (limited to 'usb/usb-s3c-hsotg-only-load-packet-per-fifo-write.patch')
| -rw-r--r-- | usb/usb-s3c-hsotg-only-load-packet-per-fifo-write.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/usb/usb-s3c-hsotg-only-load-packet-per-fifo-write.patch b/usb/usb-s3c-hsotg-only-load-packet-per-fifo-write.patch new file mode 100644 index 00000000000000..f60c81a3ea074f --- /dev/null +++ b/usb/usb-s3c-hsotg-only-load-packet-per-fifo-write.patch @@ -0,0 +1,39 @@ +From ben@ben-laptop.fluff.org Thu Jul 22 16:49:36 2010 +From: Ben Dooks <ben-linux@fluff.org> +To: linux-samsung-soc@vger.kernel.org, linux-usb@vger.kernel.org +Cc: gregkh@suse.de, Ben Dooks <ben-linux@fluff.org> +Subject: USB: s3c-hsotg: Only load packet per fifo write +Date: Mon, 19 Jul 2010 09:40:45 +0100 +Message-Id: <1279528850-28245-7-git-send-email-ben-linux@fluff.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 <ben-linux@fluff.org> +Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> + +--- + drivers/usb/gadget/s3c-hsotg.c | 11 +++++++++++ + 1 file changed, 11 insertions(+) + +--- 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 s + 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) { |