[U-Boot] [PATCH v3 2/8] ehci: Fail for multi-transaction interrupt transfers

[Marek Vasut <marex@denx.de>]

Dear Beno?t Th?baudeau,

> Interrupt transfers requiring several transactions are not supported by
> submit_int_msg() because bInterval is ignored. This patch returns a failure
> code and prints an error message in this case.
> 
> Signed-off-by: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Ilya Yanok <ilya.yanok@cogentembedded.com>
> Cc: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
> ---
> Changes for v2: N/A.
> Changes for v3:
>  - New patch.
> 
>  .../drivers/usb/host/ehci-hcd.c                    |   11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git u-boot-usb-8d5fb14.orig/drivers/usb/host/ehci-hcd.c
> u-boot-usb-8d5fb14/drivers/usb/host/ehci-hcd.c index 1977c28..a4c84a3
> 100644
> --- u-boot-usb-8d5fb14.orig/drivers/usb/host/ehci-hcd.c
> +++ u-boot-usb-8d5fb14/drivers/usb/host/ehci-hcd.c
> @@ -836,8 +836,17 @@ int
>  submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
>  	       int length, int interval)
>  {
> -
>  	debug("dev=%p, pipe=%lu, buffer=%p, length=%d, interval=%d",
>  	      dev, pipe, buffer, length, interval);
> +
> +	/*
> +	 * Interrupt transfers requiring several transactions are not supported
> +	 * because bInterval is ignored.
> +	 */
> +	if (length > usb_maxpacket(dev, pipe)) {
> +		printf("%s: Interrupt transfers requiring several transactions "
> +			"are not\nsupported.\n", __func__);

Removed the newline before supported and applied.

Thanks!

> +		return -1;
> +	}
>  	return ehci_submit_async(dev, pipe, buffer, length, NULL);
>  }

Best regards,
Marek Vasut