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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>
This commit is contained in:
Robert Baldyga 2015-07-28 07:20:00 +02:00 committed by Felipe Balbi
parent 02ded1b0d8
commit ca1023c81d
2 changed files with 11 additions and 0 deletions
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1
drivers/usb/musb/musb_gadget.c
View File

@ -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

10
include/linux/usb/gadget.h
View File

@ -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