Currently we copy over a number of usb_device values stored in the on stack struct usb_device probed in usb_scan_device() to the final driver-model managed struct usb_device in usb_child_pre_probe() through usb_device_platdata, and then call usb_select_config() to fill in the rest.
There are 2 problems with this approach:
1) It does not fill in enough fields before calling usb_select_config(), specifically it does not fill in ep0's maxpacketsize causing a div by zero exception in the ehci driver.
2) It unnecessarily redoes a number of usb requests making usb probing slower, and potentially upsetting some devices.
This commit fixes both issues by removing the usb_select_config() call from usb_child_pre_probe(), and instead of copying over things field by field through usb_device_platdata, store a pointer to the in stack usb_device (which is still valid when usb_child_pre_probe() gets called) and copy over the entire struct.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/usb/host/usb-uclass.c | 23 ++++++++--------------- include/usb.h | 5 +---- 2 files changed, 9 insertions(+), 19 deletions(-)
diff --git a/drivers/usb/host/usb-uclass.c b/drivers/usb/host/usb-uclass.c index 714bc0e..0adc271 100644 --- a/drivers/usb/host/usb-uclass.c +++ b/drivers/usb/host/usb-uclass.c @@ -535,12 +535,7 @@ int usb_scan_device(struct udevice *parent, int port, } plat = dev_get_parent_platdata(dev); debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat); - plat->devnum = udev->devnum; - plat->speed = udev->speed; - plat->slot_id = udev->slot_id; - plat->portnr = port; - debug("** device '%s': stashing slot_id=%d\n", dev->name, - plat->slot_id); + plat->udev = udev; priv->next_addr++; ret = device_probe(dev); if (ret) { @@ -607,17 +602,15 @@ int usb_child_pre_probe(struct udevice *dev) ret = usb_get_bus(dev, &bus); if (ret) return ret; + + /* + * Copy over all the values set in the on stack struct usb_device in + * usb_scan_device() to our final struct usb_device for this dev. + */ + *udev = *(plat->udev); + udev->controller_dev = bus; udev->dev = dev; - udev->devnum = plat->devnum; - udev->slot_id = plat->slot_id; - udev->portnr = plat->portnr; - udev->speed = plat->speed; - debug("** device '%s': getting slot_id=%d\n", dev->name, plat->slot_id); - - ret = usb_select_config(udev); - if (ret) - return ret;
return 0; } diff --git a/include/usb.h b/include/usb.h index 1984e8f..1b667ff 100644 --- a/include/usb.h +++ b/include/usb.h @@ -581,10 +581,7 @@ struct usb_platdata { */ struct usb_dev_platdata { struct usb_device_id id; - enum usb_device_speed speed; - int devnum; - int slot_id; - int portnr; /* Hub port number, 1..n */ + struct usb_device *udev; #ifdef CONFIG_SANDBOX struct usb_string *strings; /* NULL-terminated list of descriptor pointers */