usb: gadget: net2280: reset sequence number on ep enable

Mian Yousaf Kaukab · Felipe Balbi · commit e6ac4bb0590d · 2015-05-26T10:39:52.000-05:00
Sequence number can be out of sync if endpoint is disabled after some
data transfers and enabled again. Reset it to stay in sync with host.

Tested-by: Ricardo Ribalda Delgado &lt;ricardo.ribalda@gmail.com&gt;
Signed-off-by: Mian Yousaf Kaukab &lt;yousaf.kaukab@intel.com&gt;
Signed-off-by: Felipe Balbi &lt;balbi@ti.com&gt;
diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
@@ -123,6 +123,8 @@ static char *type_string(u8 bmAttributes)
 #define valid_bit	cpu_to_le32(BIT(VALID_BIT))
 #define dma_done_ie	cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 
+static void ep_clear_seqnum(struct net2280_ep *ep);
+
 /*-------------------------------------------------------------------------*/
 static inline void enable_pciirqenb(struct net2280_ep *ep)
 {
@@ -256,6 +258,8 @@ net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 			BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 	}
 
+	if (dev->quirks & PLX_SUPERSPEED)
+		ep_clear_seqnum(ep);
 	writel(tmp, &ep->cfg->ep_cfg);
 
 	/* enable irqs */

Original file line number	Diff line number	Diff line change
`@@ -123,6 +123,8 @@ static char *type_string(u8 bmAttributes)`
`123`	`123`	`#define valid_bit cpu_to_le32(BIT(VALID_BIT))`
`124`	`124`	`#define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))`
`125`	`125`
	`126`	`+static void ep_clear_seqnum(struct net2280_ep *ep);`
	`127`	`+`
`126`	`128`	`/-------------------------------------------------------------------------/`
`127`	`129`	`static inline void enable_pciirqenb(struct net2280_ep *ep)`
`128`	`130`	`{`
`@@ -256,6 +258,8 @@ net2280_enable(struct usb_ep _ep, const struct usb_endpoint_descriptor desc)`
`256`	`258`	`BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);`
`257`	`259`	`}`
`258`	`260`
	`261`	`+ if (dev->quirks & PLX_SUPERSPEED)`
	`262`	`+ ep_clear_seqnum(ep);`
`259`	`263`	`writel(tmp, &ep->cfg->ep_cfg);`
`260`	`264`
`261`	`265`	`/* enable irqs */`