[U-Boot] [PATCH 12/22] musb: Update usb-compat to work with struct usb_device without a parent ptr

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 29-06-15 05:45, Simon Glass wrote:
> Hi Hans,
>
> On 17 June 2015 at 13:33, Hans de Goede <hdegoede@redhat.com> wrote:
>> When building with CONFIG_DM_USB=y struct usb_device does not have a parent
>> pointer. This commit adds support to the musb code to deal with this.
>>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> ---
>>   drivers/usb/musb-new/musb_host.c  |  4 +++
>>   drivers/usb/musb-new/musb_uboot.c |  2 +-
>>   drivers/usb/musb-new/usb-compat.h | 70 +++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 75 insertions(+), 1 deletion(-)
>>
>
> Acked-by: Simon Glass <sjg@chromium.org>
>
> See note below.
>
>> diff --git a/drivers/usb/musb-new/musb_host.c b/drivers/usb/musb-new/musb_host.c
>> index 437309c..40b9c66 100644
>> --- a/drivers/usb/musb-new/musb_host.c
>> +++ b/drivers/usb/musb-new/musb_host.c
>> @@ -2067,7 +2067,11 @@ int musb_urb_enqueue(
>>
>>          /* precompute addressing for external hub/tt ports */
>>          if (musb->is_multipoint) {
>> +#ifndef __UBOOT__
>>                  struct usb_device       *parent = urb->dev->parent;
>> +#else
>> +               struct usb_device       *parent = usb_dev_get_parent(urb->dev);
>> +#endif
>>
>>   #ifndef __UBOOT__
>>                  if (parent != hcd->self.root_hub) {
>> diff --git a/drivers/usb/musb-new/musb_uboot.c b/drivers/usb/musb-new/musb_uboot.c
>> index 70e87c9..a96e8d2 100644
>> --- a/drivers/usb/musb-new/musb_uboot.c
>> +++ b/drivers/usb/musb-new/musb_uboot.c
>> @@ -97,7 +97,7 @@ int submit_control_msg(struct usb_device *dev, unsigned long pipe,
>>                        buffer, len, setup, 0);
>>
>>          /* Fix speed for non hub-attached devices */
>> -       if (!dev->parent)
>> +       if (!usb_dev_get_parent(dev))
>>                  dev->speed = host_speed;
>>
>>          return submit_urb(&hcd, &urb);
>> diff --git a/drivers/usb/musb-new/usb-compat.h b/drivers/usb/musb-new/usb-compat.h
>> index 50bad37..53fe4ff 100644
>> --- a/drivers/usb/musb-new/usb-compat.h
>> +++ b/drivers/usb/musb-new/usb-compat.h
>> @@ -1,6 +1,7 @@
>>   #ifndef __USB_COMPAT_H__
>>   #define __USB_COMPAT_H__
>>
>> +#include <dm.h>
>>   #include "usb.h"
>>
>>   struct usb_hcd {
>> @@ -66,6 +67,68 @@ static inline int usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd,
>>          return 0;
>>   }
>>
>> +#ifdef CONFIG_DM_USB
>> +static inline u16 find_tt(struct usb_device *udev)
>> +{
>> +       struct udevice *parent;
>> +       struct usb_device *uparent, *ttdev;
>> +
>> +       /*
>> +        * When called from usb-uclass.c: usb_scan_device() udev->dev points
>> +        * to the parent udevice, not the actual udevice belonging to the
>> +        * udev as the device is not instantiated yet. So when searching
>> +        * for the first usb-2 parent start with udev->dev not
>> +        * udev->dev->parent .
>> +        */
>> +       ttdev = udev;
>> +       parent = udev->dev;
>> +       uparent = dev_get_parentdata(parent);
>> +
>> +       while (uparent->speed != USB_SPEED_HIGH) {
>> +               struct udevice *dev = parent;
>> +
>> +               if (device_get_uclass_id(dev->parent) != UCLASS_USB_HUB) {
>> +                       printf("musb: Error cannot find high speed parent of usb-1 device\n");
>> +                       return 0;
>> +               }
>> +
>> +               ttdev = dev_get_parentdata(dev);
>> +               parent = dev->parent;
>> +               uparent = dev_get_parentdata(parent);
>> +       }
>> +
>> +       return (uparent->devnum << 8) | (ttdev->portnr - 1);
>> +}
>> +
>> +static inline struct usb_device *usb_dev_get_parent(struct usb_device *udev)
>> +{
>> +       struct udevice *parent = udev->dev->parent;
>> +
>> +       /*
>> +        * When called from usb-uclass.c: usb_scan_device() udev->dev points
>> +        * to the parent udevice, not the actual udevice belonging to the
>> +        * udev as the device is not instantiated yet.
>
> Another option here is to somehow allow devices to be added before we
> know what they are. In this case we could bind a 'generic' USB device
> (UCLASS_USB_DEV_GENERIC). Then when we work out what it is, we could
> unbind it (without throwing away the udevice and usb_device) and have
> it bind again as the correct device. Something like
> device_morph_child().

Right, I think that may end up being cleaner in the long term.

Regards,

Hans