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Commit ca1023c8 authored by Robert Baldyga's avatar Robert Baldyga Committed by Felipe Balbi
Browse files

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: default avatarRobert Baldyga <r.baldyga@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 02ded1b0

drivers/usb/musb/musb_gadget.c

+1 −0
Original line number Diff line number Diff line
@@ -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

include/linux/usb/gadget.h

+10 −0
Original line number Diff line number Diff line
@@ -574,6 +574,7 @@ struct usb_gadget { 
	unsigned			quirk_ep_out_aligned_size:1;

	unsigned			quirk_altset_not_supp:1;

	unsigned			quirk_stall_not_supp:1;

	unsigned			quirk_zlp_not_supp:1;

	unsigned			is_selfpowered:1;

	unsigned			deactivated:1;

	unsigned			connected:1;
@@ -630,6 +631,15 @@ static inline int gadget_is_stall_supported(struct usb_gadget *g) 
	return !g->quirk_stall_not_supp;

}



/**

 * gadget_is_zlp_supported - return true iff the hardware supports zlp

 * @g: controller to check for quirk

 */

static inline int gadget_is_zlp_supported(struct usb_gadget *g)

{

	return !g->quirk_zlp_not_supp;

}



/**

 * gadget_is_dualspeed - return true iff the hardware handles high speed

 * @g: controller that might support both high and full speeds