musb: use dma mode 1 for TX if transfer size equals maxpacket (v2)

Currently, with Inventra DMA, we use Mode 0 if transfer size is less
than or equal to the endpoint's maxpacket size.  This requires that
we explicitly set TXPKTRDY for that transfer.

However the musb_g_tx code will not set TXPKTRDY twice if the last
transfer is exactly equal to maxpacket, even if request->zero is set.
Using Mode 1 will solve this; a better fix might be in musb_g_tx().

Without this change, musb will not correctly send out a ZLP if the
last transfer is the maxpacket size and request->zero is set.

Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 858d005fae6d..8b3c4e2ed7b8 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -310,7 +310,7 @@ static void txstate(struct musb *musb, struct musb_request *req)
                         /* setup DMA, then program endpoint CSR */
                         request_size = min(request->length,
                                                 musb_ep->dma->max_len);
-                        if (request_size <= musb_ep->packet_sz)
+                        if (request_size < musb_ep->packet_sz)
                                 musb_ep->dma->desired_mode = 0;
                         else
                                 musb_ep->dma->desired_mode = 1;