[U-Boot] Question: issues for usb keyboard work with OHCI HCD

[Marek Vasut <marex@denx.de>]

Dear Bo Shen,

> Hi All,
>    Now, I test usb host support with Atmel boards, for example,
> at91sam9x5ek board.
> 
>    When test OHCI USB host with usb keyboard. I meet the following issue.
> --->8---
> U-Boot 2013.04-dirty (May 03 2013 - 11:00:34)
> 
> CPU: AT91SAM9G35
> Crystal frequency:       12 MHz
> CPU clock        :      400 MHz
> Master clock     :  133.333 MHz
> DRAM:  128 MiB
> WARNING: Caches not enabled
> NAND:  256 MiB
> MMC:   mci: 0
> In:    serial
> Out:   serial
> Err:   serial
> Net:   macb0
> Hit any key to stop autoboot:  0
> U-Boot> usb start
> (Re)start USB...
> USB0:   scanning bus 0 for devices... 2 USB Device(s) found
>         scanning usb for storage devices... 0 Storage Device(s) found
> U-Boot> setenv stdin usbkbd
> U-Boot> ERROR: sohci_submit_job: ENOMEM
> ERROR: sohci_submit_job failed
> ... ...
> (repeat to print these two error line)

So the USB subsystem is leaking memory? Or do you only have too small MALLOC 
area?

> ---<8---
> 
>    After dig the usb ohci-hcd.c driver, I found every time it call
> submit_int_msg -->
> submit_common_msg --> sohci_submit_job, it will allocate memory for td
> (just call td_alloc),
> however nowhere free the td. So, after allocate 64 times (#define NUM_TD
> 64),
> all the ptd[i].usb_dev is not NULL. So, it will report: ENOMEM.
> 
>    I don't know why in sohci_return_job it call td_submit_job again?
> --->8---
> static inline int sohci_return_job(struct ohci *hc, urb_priv_t *urb)
> {
>      struct ohci_regs *regs = hc->regs;
> 
>      switch (usb_pipetype(urb->pipe)) {
>      case PIPE_INTERRUPT:
>          /* implicitly requeued */
>          if (urb->dev->irq_handle &&
>                  (urb->dev->irq_act_len = urb->actual_length)) {
>              ohci_writel(OHCI_INTR_WDH, &regs->intrenable);
>              ohci_readl(&regs->intrenable); /* PCI posting flush */
>              urb->dev->irq_handle(urb->dev);
>              ohci_writel(OHCI_INTR_WDH, &regs->intrdisable);
>              ohci_readl(&regs->intrdisable); /* PCI posting flush */
>          }
>          urb->actual_length = 0;
>          td_submit_job(
>                  urb->dev,
>                  urb->pipe,
>                  urb->transfer_buffer,
>                  urb->transfer_buffer_length,
>                  NULL,
>                  urb,
>                  urb->interval);
>          break
> ---<8---
> 
>    Add where should we free the allocated td to fix the issue?
> 
>    Thanks.
> 
> Best Regards,
> Bo Shen

Best regards,
Marek Vasut