usb: gadget: defer setting maxpacket till ->setup()

maxpacket is set by the udc driver for ep0 very early. This value is
copied by the function gadget used later for the USB_DT_DEVICE and
USB_DT_DEVICE_QUALIFIER query. This seems to work fine so far. For USB3
we need set a different value here. In SS speed it is 2^x with x=9 and
in HS we set something <= 64. If the UDC starts in SS and continues in
HS after the cable has been plugged it will report a too small value.
There setting of this value is defered and taken automaticly from the
ep0 pointer where the UDC driver can update it according to the speed it
detected _after_ a cable has been plugged.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

6 files changed, 20 insertions, 17 deletions

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index c5abe270970a..5ef87794fd32 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -573,7 +573,7 @@ static void device_qual(struct usb_composite_dev *cdev)
         qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
         qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
         /* ASSUME same EP0 fifo size at both speeds */
-        qual->bMaxPacketSize0 = cdev->desc.bMaxPacketSize0;
+        qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
         qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
         qual->bRESERVED = 0;
 }
@@ -1450,7 +1450,6 @@ static int composite_bind(struct usb_gadget *gadget)
                 goto fail;
 
         cdev->desc = *composite->dev;
-        cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
 
         /* standardized runtime overrides for device ID data */
         if (idVendor)
diff --git a/drivers/usb/gadget/dbgp.c b/drivers/usb/gadget/dbgp.c
index 052209e89271..8beefdd36787 100644
--- a/drivers/usb/gadget/dbgp.c
+++ b/drivers/usb/gadget/dbgp.c
@@ -314,7 +314,6 @@ static int __init dbgp_bind(struct usb_gadget *gadget)
 
         dbgp.req->length = DBGP_REQ_EP0_LEN;
         gadget->ep0->driver_data = gadget;
-        device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
 
 #ifdef CONFIG_USB_G_DBGP_SERIAL
         dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
@@ -365,6 +364,7 @@ static int dbgp_setup(struct usb_gadget *gadget,
                         dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
                         len = sizeof device_desc;
                         data = &device_desc;
+                        device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
                         break;
                 case USB_DT_DEBUG:
                         dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 738591a64bb4..639e14a2fd15 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -929,6 +929,7 @@ static int standard_setup_req(struct fsg_dev *fsg,
 
                 case USB_DT_DEVICE:
                         VDBG(fsg, "get device descriptor\n");
+                        device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
                         value = sizeof device_desc;
                         memcpy(req->buf, &device_desc, value);
                         break;
@@ -936,6 +937,11 @@ static int standard_setup_req(struct fsg_dev *fsg,
                         VDBG(fsg, "get device qualifier\n");
                         if (!gadget_is_dualspeed(fsg->gadget))
                                 break;
+                        /*
+                         * Assume ep0 uses the same maxpacket value for both
+                         * speeds
+                         */
+                        dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
                         value = sizeof dev_qualifier;
                         memcpy(req->buf, &dev_qualifier, value);
                         break;
@@ -3417,7 +3423,6 @@ static int __init fsg_bind(struct usb_gadget *gadget)
         }
 
         /* Fix up the descriptors */
-        device_desc.bMaxPacketSize0 = fsg->ep0->maxpacket;
         device_desc.idVendor = cpu_to_le16(mod_data.vendor);
         device_desc.idProduct = cpu_to_le16(mod_data.product);
         device_desc.bcdDevice = cpu_to_le16(mod_data.release);
@@ -3431,9 +3436,6 @@ static int __init fsg_bind(struct usb_gadget *gadget)
         if (gadget_is_dualspeed(gadget)) {
                 fsg_hs_function[i + FSG_HS_FUNCTION_PRE_EP_ENTRIES] = NULL;
 
-                /* Assume ep0 uses the same maxpacket value for both speeds */
-                dev_qualifier.bMaxPacketSize0 = fsg->ep0->maxpacket;
-
                 /* Assume endpoint addresses are the same for both speeds */
                 fsg_hs_bulk_in_desc.bEndpointAddress =
                         fsg_fs_bulk_in_desc.bEndpointAddress;
diff --git a/drivers/usb/gadget/gmidi.c b/drivers/usb/gadget/gmidi.c
index 4f40f1467438..8b9220e128a7 100644
--- a/drivers/usb/gadget/gmidi.c
+++ b/drivers/usb/gadget/gmidi.c
@@ -695,6 +695,7 @@ static int gmidi_setup(struct usb_gadget *gadget,
                 switch (w_value >> 8) {
 
                 case USB_DT_DEVICE:
+                        device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
                         value = min(w_length, (u16) sizeof(device_desc));
                         memcpy(req->buf, &device_desc, value);
                         break;
@@ -1249,8 +1250,6 @@ autoconf_fail:
 
         dev->req->complete = gmidi_setup_complete;
 
-        device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
-
         gadget->ep0->driver_data = dev;
 
         INFO(dev, "%s, version: " DRIVER_VERSION "\n", longname);
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index a9a455692397..1b240990448f 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -1347,7 +1347,7 @@ static void make_qualifier (struct dev_data *dev)
         qual.bDeviceProtocol = desc->bDeviceProtocol;
 
         /* assumes ep0 uses the same value for both speeds ... */
-        qual.bMaxPacketSize0 = desc->bMaxPacketSize0;
+        qual.bMaxPacketSize0 = dev->gadget->ep0->maxpacket;
 
         qual.bNumConfigurations = 1;
         qual.bRESERVED = 0;
@@ -1404,7 +1404,6 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                 }
 
                 dev->state = STATE_DEV_CONNECTED;
-                dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
 
                 INFO (dev, "connected\n");
                 event = next_event (dev, GADGETFS_CONNECT);
@@ -1432,6 +1431,7 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 
                 case USB_DT_DEVICE:
                         value = min (w_length, (u16) sizeof *dev->dev);
+                        dev->dev->bMaxPacketSize0 = dev->gadget->ep0->maxpacket;
                         req->buf = dev->dev;
                         break;
 #ifdef  CONFIG_USB_GADGET_DUALSPEED
@@ -1712,7 +1712,6 @@ gadgetfs_bind (struct usb_gadget *gadget)
         set_gadget_data (gadget, dev);
         dev->gadget = gadget;
         gadget->ep0->driver_data = dev;
-        dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
 
         /* preallocate control response and buffer */
         dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 00e5f19c75ba..d5df8dd9d58e 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -1148,6 +1148,8 @@ printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                         switch (wValue >> 8) {
 
                         case USB_DT_DEVICE:
+                                device_desc.bMaxPacketSize0 =
+                                        gadget->ep0->maxpacket;
                                 value = min(wLength, (u16) sizeof device_desc);
                                 memcpy(req->buf, &device_desc, value);
                                 break;
@@ -1155,6 +1157,12 @@ printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                         case USB_DT_DEVICE_QUALIFIER:
                                 if (!gadget->is_dualspeed)
                                         break;
+                                /*
+                                 * assumes ep0 uses the same value for both
+                                 * speeds
+                                 */
+                                dev_qualifier.bMaxPacketSize0 =
+                                        gadget->ep0->maxpacket;
                                 value = min(wLength,
                                                 (u16) sizeof dev_qualifier);
                                 memcpy(req->buf, &dev_qualifier, value);
@@ -1450,15 +1458,11 @@ autoconf_fail:
         out_ep->driver_data = out_ep;   /* claim */
 
 #ifdef  CONFIG_USB_GADGET_DUALSPEED
-        /* assumes ep0 uses the same value for both speeds ... */
-        dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
-
-        /* and that all endpoints are dual-speed */
+        /* assumes that all endpoints are dual-speed */
         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
 #endif  /* DUALSPEED */
 
-        device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
         usb_gadget_set_selfpowered(gadget);
 
         if (gadget->is_otg) {