usb: gadget: add "maxpacket_limit" field to struct usb_ep

This patch adds "maxpacket_limit" to struct usb_ep. This field contains
maximum value of maxpacket supported by driver, and is set in driver probe.
This value should be used by autoconfig() function, because value of field
"maxpacket" is set to value from endpoint descriptor when endpoint becomes
enabled. So when autoconfig() function will be called again for this endpoint,
"maxpacket" value will contain wMaxPacketSize from descriptior instead of
maximum packet size for this endpoint.

For this reason this patch adds new field "maxpacket_limit" which contains
value of maximum packet size (which defines maximum endpoint capabilities).
This value is used in ep_matches() function used by autoconfig().

Value of "maxpacket_limit" should be set in UDC driver probe function, using
usb_ep_set_maxpacket_limit() function, defined in gadget.h. This function
set choosen value to both "maxpacket_limit" and "maxpacket" fields.

This patch modifies UDC drivers by adding support for maxpacket_limit.

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

30 files changed, 92 insertions, 61 deletions

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index b34c81969cba..77e4a17cfb44 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1566,7 +1566,7 @@ static int init_eps(struct ci_hdrc *ci)
                          * eps, maxP is set by epautoconfig() called
                          * by gadget layer
                          */
-                        hwep->ep.maxpacket = (unsigned short)~0;
+                        usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
 
                         INIT_LIST_HEAD(&hwep->qh.queue);
                         hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
@@ -1586,7 +1586,7 @@ static int init_eps(struct ci_hdrc *ci)
                                 else
                                         ci->ep0in = hwep;
 
-                                hwep->ep.maxpacket = CTRL_PAYLOAD_MAX;
+                                usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
                                 continue;
                         }
 
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index b85ec110d6a0..5401b2b573d5 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1653,7 +1653,7 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
                 dev_vdbg(dwc->dev, "initializing %s\n", dep->name);
 
                 if (epnum == 0 || epnum == 1) {
-                        dep->endpoint.maxpacket = 512;
+                        usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
                         dep->endpoint.maxburst = 1;
                         dep->endpoint.ops = &dwc3_gadget_ep0_ops;
                         if (!epnum)
@@ -1661,7 +1661,7 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
                 } else {
                         int             ret;
 
-                        dep->endpoint.maxpacket = 1024;
+                        usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
                         dep->endpoint.max_streams = 15;
                         dep->endpoint.ops = &dwc3_gadget_ep_ops;
                         list_add_tail(&dep->endpoint.ep_list,
diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index f0ff4a675e9d..a04aa8b64472 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -446,7 +446,7 @@ static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
         ep->ep.ops = &udc_ep_ops;
         INIT_LIST_HEAD(&ep->queue);
 
-        ep->ep.maxpacket = (u16) ~0;
+        usb_ep_set_maxpacket_limit(&ep->ep,(u16) ~0);
         /* set NAK */
         tmp = readl(&ep->regs->ctl);
         tmp |= AMD_BIT(UDC_EPCTL_SNAK);
@@ -1564,12 +1564,15 @@ static void udc_setup_endpoints(struct udc *dev)
         }
         /* EP0 max packet */
         if (dev->gadget.speed == USB_SPEED_FULL) {
-                dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_FS_EP0IN_MAX_PKT_SIZE;
-                dev->ep[UDC_EP0OUT_IX].ep.maxpacket =
-                                                UDC_FS_EP0OUT_MAX_PKT_SIZE;
+                usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IX].ep,
+                                           UDC_FS_EP0IN_MAX_PKT_SIZE);
+                usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IX].ep,
+                                           UDC_FS_EP0OUT_MAX_PKT_SIZE);
         } else if (dev->gadget.speed == USB_SPEED_HIGH) {
-                dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
-                dev->ep[UDC_EP0OUT_IX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
+                usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IX].ep,
+                                           UDC_EP0IN_MAX_PKT_SIZE);
+                usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IX].ep,
+                                           UDC_EP0OUT_MAX_PKT_SIZE);
         }
 
         /*
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 4cc4fd6d1473..0353b6471bde 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -834,7 +834,7 @@ static void udc_reinit(struct at91_udc *udc)
                 ep->ep.desc = NULL;
                 ep->stopped = 0;
                 ep->fifo_bank = 0;
-                ep->ep.maxpacket = ep->maxpacket;
+                usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
                 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
                 /* initialize one queue per endpoint */
                 INIT_LIST_HEAD(&ep->queue);
@@ -1759,15 +1759,15 @@ static int at91udc_probe(struct platform_device *pdev)
 
         /* newer chips have more FIFO memory than rm9200 */
         if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
-                udc->ep[0].maxpacket = 64;
-                udc->ep[3].maxpacket = 64;
-                udc->ep[4].maxpacket = 512;
-                udc->ep[5].maxpacket = 512;
+                usb_ep_set_maxpacket_limit(&udc->ep[0], 64);
+                usb_ep_set_maxpacket_limit(&udc->ep[3], 64);
+                usb_ep_set_maxpacket_limit(&udc->ep[4], 512);
+                usb_ep_set_maxpacket_limit(&udc->ep[5], 512);
         } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
-                udc->ep[3].maxpacket = 64;
+                usb_ep_set_maxpacket_limit(&udc->ep[3], 64);
         } else if (cpu_is_at91sam9263()) {
-                udc->ep[0].maxpacket = 64;
-                udc->ep[3].maxpacket = 64;
+                usb_ep_set_maxpacket_limit(&udc->ep[0], 64);
+                usb_ep_set_maxpacket_limit(&udc->ep[3], 64);
         }
 
         udc->udp_baseaddr = ioremap(res->start, resource_size(res));
diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 2cb52e0438df..68cf3a40f98e 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -1904,7 +1904,7 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
                 ep->ep.ops = &usba_ep_ops;
-                ep->ep.maxpacket = ep->fifo_size;
+                usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
                 ep->udc = udc;
                 INIT_LIST_HEAD(&ep->queue);
 
@@ -1957,7 +1957,8 @@ static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
                 ep->ep.ops = &usba_ep_ops;
                 ep->ep.name = pdata->ep[i].name;
-                ep->fifo_size = ep->ep.maxpacket = pdata->ep[i].fifo_size;
+                ep->fifo_size = pdata->ep[i].fifo_size;
+                usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
                 ep->udc = udc;
                 INIT_LIST_HEAD(&ep->queue);
                 ep->nr_banks = pdata->ep[i].nr_banks;
diff --git a/drivers/usb/gadget/bcm63xx_udc.c b/drivers/usb/gadget/bcm63xx_udc.c
index c58fcf1ebe41..2ac7a8f4bfff 100644
--- a/drivers/usb/gadget/bcm63xx_udc.c
+++ b/drivers/usb/gadget/bcm63xx_udc.c
@@ -549,7 +549,7 @@ static void bcm63xx_ep_setup(struct bcm63xx_udc *udc)
 
                 if (idx < 0)
                         continue;
-                udc->bep[idx].ep.maxpacket = max_pkt;
+                usb_ep_set_maxpacket_limit(&udc->bep[idx].ep, max_pkt);
 
                 val = (idx << USBD_CSR_EP_LOG_SHIFT) |
                       (cfg->dir << USBD_CSR_EP_DIR_SHIFT) |
@@ -943,7 +943,7 @@ static int bcm63xx_init_udc_hw(struct bcm63xx_udc *udc)
                 bep->ep.ops = &bcm63xx_udc_ep_ops;
                 list_add_tail(&bep->ep.ep_list, &udc->gadget.ep_list);
                 bep->halted = 0;
-                bep->ep.maxpacket = BCM63XX_MAX_CTRL_PKT;
+                usb_ep_set_maxpacket_limit(&bep->ep, BCM63XX_MAX_CTRL_PKT);
                 bep->udc = udc;
                 bep->ep.desc = NULL;
                 INIT_LIST_HEAD(&bep->queue);
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 8f4dae310923..8c06430dcc47 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -951,7 +951,7 @@ static void init_dummy_udc_hw(struct dummy *dum)
                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
                 ep->halted = ep->wedged = ep->already_seen =
                                 ep->setup_stage = 0;
-                ep->ep.maxpacket = ~0;
+                usb_ep_set_maxpacket_limit(&ep->ep, ~0);
                 ep->ep.max_streams = 16;
                 ep->last_io = jiffies;
                 ep->gadget = &dum->gadget;
diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index feaaa7b72ee3..358de320afb0 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -129,7 +129,7 @@ ep_matches (
          * and wants to know the maximum possible, provide the info.
          */
         if (desc->wMaxPacketSize == 0)
-                desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket);
+                desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket_limit);
 
         /* endpoint maxpacket size is an input parameter, except for bulk
          * where it's an output parameter representing the full speed limit.
@@ -145,7 +145,7 @@ ep_matches (
 
         case USB_ENDPOINT_XFER_ISOC:
                 /* ISO:  limit 1023 bytes full speed, 1024 high/super speed */
-                if (ep->maxpacket < max)
+                if (ep->maxpacket_limit < max)
                         return 0;
                 if (!gadget_is_dualspeed(gadget) && max > 1023)
                         return 0;
@@ -178,7 +178,7 @@ ep_matches (
 
         /* report (variable) full speed bulk maxpacket */
         if ((USB_ENDPOINT_XFER_BULK == type) && !ep_comp) {
-                int size = ep->maxpacket;
+                int size = ep->maxpacket_limit;
 
                 /* min() doesn't work on bitfields with gcc-3.5 */
                 if (size > 64)
diff --git a/drivers/usb/gadget/fotg210-udc.c b/drivers/usb/gadget/fotg210-udc.c
index bbbfd1948778..2d0305280e8c 100644
--- a/drivers/usb/gadget/fotg210-udc.c
+++ b/drivers/usb/gadget/fotg210-udc.c
@@ -1157,8 +1157,9 @@ static int fotg210_udc_probe(struct platform_device *pdev)
                 INIT_LIST_HEAD(&ep->queue);
                 ep->ep.name = fotg210_ep_name[i];
                 ep->ep.ops = &fotg210_ep_ops;
+                usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
         }
-        fotg210->ep[0]->ep.maxpacket = 0x40;
+        usb_ep_set_maxpacket_limit(&fotg210->ep[0]->ep, 0x40);
         fotg210->gadget.ep0 = &fotg210->ep[0]->ep;
         INIT_LIST_HEAD(&fotg210->gadget.ep0->ep_list);
 
diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index 6315ee698d4d..f60d4da8f2c0 100644
--- a/drivers/usb/gadget/fsl_qe_udc.c
+++ b/drivers/usb/gadget/fsl_qe_udc.c
@@ -2429,7 +2429,7 @@ static int qe_ep_config(struct qe_udc *udc, unsigned char pipe_num)
 
         ep->ep.ops = &qe_ep_ops;
         ep->stopped = 1;
-        ep->ep.maxpacket = (unsigned short) ~0;
+        usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
         ep->ep.desc = NULL;
         ep->dir = 0xff;
         ep->epnum = (u8)pipe_num;
diff --git a/drivers/usb/gadget/fsl_udc_core.c b/drivers/usb/gadget/fsl_udc_core.c
index b7dea4eec32c..15960af0f67e 100644
--- a/drivers/usb/gadget/fsl_udc_core.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -2311,7 +2311,7 @@ static int __init struct_ep_setup(struct fsl_udc *udc, unsigned char index,
         /* for ep0: maxP defined in desc
          * for other eps, maxP is set by epautoconfig() called by gadget layer
          */
-        ep->ep.maxpacket = (unsigned short) ~0;
+        usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
 
         /* the queue lists any req for this ep */
         INIT_LIST_HEAD(&ep->queue);
@@ -2469,7 +2469,8 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
          * for other eps, gadget layer called ep_enable with defined desc
          */
         udc_controller->eps[0].ep.desc = &fsl_ep0_desc;
-        udc_controller->eps[0].ep.maxpacket = USB_MAX_CTRL_PAYLOAD;
+        usb_ep_set_maxpacket_limit(&udc_controller->eps[0].ep,
+                                   USB_MAX_CTRL_PAYLOAD);
 
         /* setup the udc->eps[] for non-control endpoints and link
          * to gadget.ep_list */
diff --git a/drivers/usb/gadget/fusb300_udc.c b/drivers/usb/gadget/fusb300_udc.c
index b278abe52453..6423f1840ed9 100644
--- a/drivers/usb/gadget/fusb300_udc.c
+++ b/drivers/usb/gadget/fusb300_udc.c
@@ -1452,9 +1452,9 @@ static int __init fusb300_probe(struct platform_device *pdev)
                 INIT_LIST_HEAD(&ep->queue);
                 ep->ep.name = fusb300_ep_name[i];
                 ep->ep.ops = &fusb300_ep_ops;
-                ep->ep.maxpacket = HS_BULK_MAX_PACKET_SIZE;
+                usb_ep_set_maxpacket_limit(&ep->ep, HS_BULK_MAX_PACKET_SIZE);
         }
-        fusb300->ep[0]->ep.maxpacket = HS_CTL_MAX_PACKET_SIZE;
+        usb_ep_set_maxpacket_limit(&fusb300->ep[0]->ep, HS_CTL_MAX_PACKET_SIZE);
         fusb300->ep[0]->epnum = 0;
         fusb300->gadget.ep0 = &fusb300->ep[0]->ep;
         INIT_LIST_HEAD(&fusb300->gadget.ep0->ep_list);
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 7eda9fd6528e..f66f3a7a35ef 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -231,7 +231,7 @@ static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
                 }
         }
 
-        ep->ep.maxpacket = MAX_FIFO_SIZE;
+        usb_ep_set_maxpacket_limit(&ep->ep, MAX_FIFO_SIZE);
         ep->ep.desc = NULL;
         ep->stopped = 1;
         ep->irqs = 0;
@@ -1251,7 +1251,7 @@ static void udc_reinit (struct goku_udc *dev)
         }
 
         dev->ep[0].reg_mode = NULL;
-        dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
+        usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE);
         list_del_init (&dev->ep[0].ep.ep_list);
 }
 
diff --git a/drivers/usb/gadget/lpc32xx_udc.c b/drivers/usb/gadget/lpc32xx_udc.c
index 6a2a65aa0057..049ebab0d360 100644
--- a/drivers/usb/gadget/lpc32xx_udc.c
+++ b/drivers/usb/gadget/lpc32xx_udc.c
@@ -1449,7 +1449,7 @@ static void udc_reinit(struct lpc32xx_udc *udc)
 
                 if (i != 0)
                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
-                ep->ep.maxpacket = ep->maxpacket;
+                usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
                 INIT_LIST_HEAD(&ep->queue);
                 ep->req_pending = 0;
         }
diff --git a/drivers/usb/gadget/m66592-udc.c b/drivers/usb/gadget/m66592-udc.c
index d5f050d30edf..8cae01d88597 100644
--- a/drivers/usb/gadget/m66592-udc.c
+++ b/drivers/usb/gadget/m66592-udc.c
@@ -1647,9 +1647,9 @@ static int __init m66592_probe(struct platform_device *pdev)
                 INIT_LIST_HEAD(&ep->queue);
                 ep->ep.name = m66592_ep_name[i];
                 ep->ep.ops = &m66592_ep_ops;
-                ep->ep.maxpacket = 512;
+                usb_ep_set_maxpacket_limit(&ep->ep, 512);
         }
-        m66592->ep[0].ep.maxpacket = 64;
+        usb_ep_set_maxpacket_limit(&m66592->ep[0].ep, 64);
         m66592->ep[0].pipenum = 0;
         m66592->ep[0].fifoaddr = M66592_CFIFO;
         m66592->ep[0].fifosel = M66592_CFIFOSEL;
diff --git a/drivers/usb/gadget/mv_u3d_core.c b/drivers/usb/gadget/mv_u3d_core.c
index 234711eabea1..9fe31d7dded6 100644
--- a/drivers/usb/gadget/mv_u3d_core.c
+++ b/drivers/usb/gadget/mv_u3d_core.c
@@ -1336,7 +1336,7 @@ static int mv_u3d_eps_init(struct mv_u3d *u3d)
         ep->ep.name = ep->name;
         ep->ep.ops = &mv_u3d_ep_ops;
         ep->wedge = 0;
-        ep->ep.maxpacket = MV_U3D_EP0_MAX_PKT_SIZE;
+        usb_ep_set_maxpacket_limit(&ep->ep, MV_U3D_EP0_MAX_PKT_SIZE);
         ep->ep_num = 0;
         ep->ep.desc = &mv_u3d_ep0_desc;
         INIT_LIST_HEAD(&ep->queue);
@@ -1361,7 +1361,7 @@ static int mv_u3d_eps_init(struct mv_u3d *u3d)
                 ep->ep.name = ep->name;
 
                 ep->ep.ops = &mv_u3d_ep_ops;
-                ep->ep.maxpacket = (unsigned short) ~0;
+                usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
                 ep->ep_num = i / 2;
 
                 INIT_LIST_HEAD(&ep->queue);
diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index 104cdbea635a..d43ce95fc4bd 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -1261,7 +1261,7 @@ static int eps_init(struct mv_udc *udc)
         ep->ep.ops = &mv_ep_ops;
         ep->wedge = 0;
         ep->stopped = 0;
-        ep->ep.maxpacket = EP0_MAX_PKT_SIZE;
+        usb_ep_set_maxpacket_limit(&ep->ep, EP0_MAX_PKT_SIZE);
         ep->ep_num = 0;
         ep->ep.desc = &mv_ep0_desc;
         INIT_LIST_HEAD(&ep->queue);
@@ -1284,7 +1284,7 @@ static int eps_init(struct mv_udc *udc)
 
                 ep->ep.ops = &mv_ep_ops;
                 ep->stopped = 0;
-                ep->ep.maxpacket = (unsigned short) ~0;
+                usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
                 ep->ep_num = i / 2;
 
                 INIT_LIST_HEAD(&ep->queue);
diff --git a/drivers/usb/gadget/net2272.c b/drivers/usb/gadget/net2272.c
index bf2bb39f35a2..ca15405583e2 100644
--- a/drivers/usb/gadget/net2272.c
+++ b/drivers/usb/gadget/net2272.c
@@ -266,7 +266,7 @@ static void net2272_ep_reset(struct net2272_ep *ep)
         ep->desc = NULL;
         INIT_LIST_HEAD(&ep->queue);
 
-        ep->ep.maxpacket = ~0;
+        usb_ep_set_maxpacket_limit(&ep->ep, ~0);
         ep->ep.ops = &net2272_ep_ops;
 
         /* disable irqs, endpoint */
@@ -1409,7 +1409,7 @@ net2272_usb_reinit(struct net2272 *dev)
                         ep->fifo_size = 64;
                 net2272_ep_reset(ep);
         }
-        dev->ep[0].ep.maxpacket = 64;
+        usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
 
         dev->gadget.ep0 = &dev->ep[0].ep;
         dev->ep[0].stopped = 0;
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
index fc852177c087..43e5e2f9888f 100644
--- a/drivers/usb/gadget/net2280.c
+++ b/drivers/usb/gadget/net2280.c
@@ -293,7 +293,7 @@ static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
         ep->desc = NULL;
         INIT_LIST_HEAD (&ep->queue);
 
-        ep->ep.maxpacket = ~0;
+        usb_ep_set_maxpacket_limit(&ep->ep, ~0);
         ep->ep.ops = &net2280_ep_ops;
 
         /* disable the dma, irqs, endpoint... */
@@ -1805,9 +1805,9 @@ static void usb_reinit (struct net2280 *dev)
                 ep->regs = &dev->epregs [tmp];
                 ep_reset (dev->regs, ep);
         }
-        dev->ep [0].ep.maxpacket = 64;
-        dev->ep [5].ep.maxpacket = 64;
-        dev->ep [6].ep.maxpacket = 64;
+        usb_ep_set_maxpacket_limit(&dev->ep [0].ep, 64);
+        usb_ep_set_maxpacket_limit(&dev->ep [5].ep, 64);
+        usb_ep_set_maxpacket_limit(&dev->ep [6].ep, 64);
 
         dev->gadget.ep0 = &dev->ep [0].ep;
         dev->ep [0].stopped = 0;
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 83957cc225d9..34bd713065c5 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -2586,7 +2586,8 @@ omap_ep_setup(char *name, u8 addr, u8 type,
 
         ep->ep.name = ep->name;
         ep->ep.ops = &omap_ep_ops;
-        ep->ep.maxpacket = ep->maxpacket = maxp;
+        ep->maxpacket = maxp;
+        usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 
         return buf;
diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 78a3d9289816..eb8c3bedb57a 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2896,12 +2896,12 @@ static void pch_udc_pcd_reinit(struct pch_udc_dev *dev)
                         ep->offset_addr = (UDC_EPINT_OUT_SHIFT + ep->num) *
                                           UDC_EP_REG_SHIFT;
                 /* need to set ep->ep.maxpacket and set Default Configuration?*/
-                ep->ep.maxpacket = UDC_BULK_MAX_PKT_SIZE;
+                usb_ep_set_maxpacket_limit(&ep->ep, UDC_BULK_MAX_PKT_SIZE);
                 list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
                 INIT_LIST_HEAD(&ep->queue);
         }
-        dev->ep[UDC_EP0IN_IDX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
-        dev->ep[UDC_EP0OUT_IDX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
+        usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IDX].ep, UDC_EP0IN_MAX_PKT_SIZE);
+        usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IDX].ep, UDC_EP0OUT_MAX_PKT_SIZE);
 
         /* remove ep0 in and out from the list.  They have own pointer */
         list_del_init(&dev->ep[UDC_EP0IN_IDX].ep.ep_list);
diff --git a/drivers/usb/gadget/pxa25x_udc.c b/drivers/usb/gadget/pxa25x_udc.c
index 0ac6064aa3b8..5b4f43730d8b 100644
--- a/drivers/usb/gadget/pxa25x_udc.c
+++ b/drivers/usb/gadget/pxa25x_udc.c
@@ -1193,6 +1193,7 @@ static void udc_reinit(struct pxa25x_udc *dev)
                 ep->stopped = 0;
                 INIT_LIST_HEAD (&ep->queue);
                 ep->pio_irqs = 0;
+                usb_ep_set_maxpacket_limit(&ep->ep, ep->ep.maxpacket);
         }
 
         /* the rest was statically initialized, and is read-only */
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 3c97da7760da..cdf4d678be96 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -1737,9 +1737,12 @@ static void udc_init_data(struct pxa_udc *dev)
         }
 
         /* USB endpoints init */
-        for (i = 1; i < NR_USB_ENDPOINTS; i++)
+        for (i = 1; i < NR_USB_ENDPOINTS; i++) {
                 list_add_tail(&dev->udc_usb_ep[i].usb_ep.ep_list,
                                 &dev->gadget.ep_list);
+                usb_ep_set_maxpacket_limit(&dev->udc_usb_ep[i].usb_ep,
+                                           dev->udc_usb_ep[i].usb_ep.maxpacket);
+        }
 }
 
 /**
diff --git a/drivers/usb/gadget/r8a66597-udc.c b/drivers/usb/gadget/r8a66597-udc.c
index 47287518bff3..aff0a6718bc6 100644
--- a/drivers/usb/gadget/r8a66597-udc.c
+++ b/drivers/usb/gadget/r8a66597-udc.c
@@ -1964,9 +1964,9 @@ static int __init r8a66597_probe(struct platform_device *pdev)
                 INIT_LIST_HEAD(&ep->queue);
                 ep->ep.name = r8a66597_ep_name[i];
                 ep->ep.ops = &r8a66597_ep_ops;
-                ep->ep.maxpacket = 512;
+                usb_ep_set_maxpacket_limit(&ep->ep, 512);
         }
-        r8a66597->ep[0].ep.maxpacket = 64;
+        usb_ep_set_maxpacket_limit(&r8a66597->ep[0].ep, 64);
         r8a66597->ep[0].pipenum = 0;
         r8a66597->ep[0].fifoaddr = CFIFO;
         r8a66597->ep[0].fifosel = CFIFOSEL;
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 6c80bfcefa87..50df18d1f1cf 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -3150,7 +3150,7 @@ static void s3c_hsotg_initep(struct s3c_hsotg *hsotg,
 
         hs_ep->parent = hsotg;
         hs_ep->ep.name = hs_ep->name;
-        hs_ep->ep.maxpacket = epnum ? 1024 : EP0_MPS_LIMIT;
+        usb_ep_set_maxpacket_limit(&hs_ep->ep, epnum ? 1024 : EP0_MPS_LIMIT);
         hs_ep->ep.ops = &s3c_hsotg_ep_ops;
 
         /*
diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
index 1a1a41498db2..ea4bbfe72ec0 100644
--- a/drivers/usb/gadget/s3c-hsudc.c
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -999,7 +999,7 @@ static void s3c_hsudc_initep(struct s3c_hsudc *hsudc,
 
         hsep->dev = hsudc;
         hsep->ep.name = hsep->name;
-        hsep->ep.maxpacket = epnum ? 512 : 64;
+        usb_ep_set_maxpacket_limit(&hsep->ep, epnum ? 512 : 64);
         hsep->ep.ops = &s3c_hsudc_ep_ops;
         hsep->fifo = hsudc->regs + S3C_BR(epnum);
         hsep->ep.desc = NULL;
diff --git a/drivers/usb/gadget/s3c2410_udc.c b/drivers/usb/gadget/s3c2410_udc.c
index c72d810e6b36..f04b2c3154de 100644
--- a/drivers/usb/gadget/s3c2410_udc.c
+++ b/drivers/usb/gadget/s3c2410_udc.c
@@ -1629,6 +1629,7 @@ static void s3c2410_udc_reinit(struct s3c2410_udc *dev)
                 ep->ep.desc = NULL;
                 ep->halted = 0;
                 INIT_LIST_HEAD(&ep->queue);
+                usb_ep_set_maxpacket_limit(&ep->ep, &ep->ep.maxpacket);
         }
 }
 
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index d2d3a173b315..76f007654821 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1727,14 +1727,14 @@ init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
         ep->end_point.name = ep->name;
         INIT_LIST_HEAD(&ep->end_point.ep_list);
         if (!epnum) {
-                ep->end_point.maxpacket = 64;
+                usb_ep_set_maxpacket_limit(&ep->end_point, 64);
                 ep->end_point.ops = &musb_g_ep0_ops;
                 musb->g.ep0 = &ep->end_point;
         } else {
                 if (is_in)
-                        ep->end_point.maxpacket = hw_ep->max_packet_sz_tx;
+                        usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_tx);
                 else
-                        ep->end_point.maxpacket = hw_ep->max_packet_sz_rx;
+                        usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_rx);
                 ep->end_point.ops = &musb_ep_ops;
                 list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
         }
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 3385aeb5a364..458f3766bef1 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -987,11 +987,11 @@ int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
                 /* init DCP */
                 if (usbhsg_is_dcp(uep)) {
                         gpriv->gadget.ep0 = &uep->ep;
-                        uep->ep.maxpacket = 64;
+                        usb_ep_set_maxpacket_limit(&uep->ep, 64);
                 }
                 /* init normal pipe */
                 else {
-                        uep->ep.maxpacket = 512;
+                        usb_ep_set_maxpacket_limit(&uep->ep, 512);
                         list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
                 }
         }
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index cae8a6216551..c3a61853cd13 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -148,6 +148,9 @@ struct usb_ep_ops {
  * @maxpacket:The maximum packet size used on this endpoint.  The initial
  *      value can sometimes be reduced (hardware allowing), according to
  *      the endpoint descriptor used to configure the endpoint.
+ * @maxpacket_limit:The maximum packet size value which can be handled by this
+ *      endpoint. It's set once by UDC driver when endpoint is initialized, and
+ *      should not be changed. Should not be confused with maxpacket.
  * @max_streams: The maximum number of streams supported
  *      by this EP (0 - 16, actual number is 2^n)
  * @mult: multiplier, 'mult' value for SS Isoc EPs
@@ -171,6 +174,7 @@ struct usb_ep {
         const struct usb_ep_ops *ops;
         struct list_head        ep_list;
         unsigned                maxpacket:16;
+        unsigned                maxpacket_limit:16;
         unsigned                max_streams:16;
         unsigned                mult:2;
         unsigned                maxburst:5;
@@ -182,6 +186,21 @@ struct usb_ep {
 /*-------------------------------------------------------------------------*/
 
 /**
+ * usb_ep_set_maxpacket_limit - set maximum packet size limit for endpoint
+ * @ep:the endpoint being configured
+ * @maxpacket_limit:value of maximum packet size limit
+ *
+ * This function shoud be used only in UDC drivers to initialize endpoint
+ * (usually in probe function).
+ */
+static inline void usb_ep_set_maxpacket_limit(struct usb_ep *ep,
+                                              unsigned maxpacket_limit)
+{
+        ep->maxpacket_limit = maxpacket_limit;
+        ep->maxpacket = maxpacket_limit;
+}
+
+/**
  * usb_ep_enable - configure endpoint, making it usable
  * @ep:the endpoint being configured.  may not be the endpoint named "ep0".
  *      drivers discover endpoints through the ep_list of a usb_gadget.