usb: gadget: add 'quirk_zlp_not_supp' to usb_gadget

Due to some UDC controllers may not support zlp, usb gadget layer
needs to provide a generic way to inform gadget functions about non-standard
hardware limitations.

This patch adds 'quirk_zlp_not_supp' field to struct usb_gadget and helper
function gadget_is_zlp_supported(). It also sets 'quirk_zlp_not_supp'
to 1 in musb UDC driver, which has such limitation.

[ balbi@ti.com : make it build ]

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 625d482..9e18178 100644 (file)
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -2075,6 +2075,7 @@ __acquires(musb->lock)
        musb->g.b_hnp_enable = 0;
        musb->g.a_alt_hnp_support = 0;
        musb->g.a_hnp_support = 0;
+       musb->g.quirk_zlp_not_supp = 1;
 
        /* Normal reset, as B-Device;
         * or else after HNP, as A-Device

diff --cc include/linux/usb/gadget.h
Simple merge