[U-Boot] [PATCH] usb_storage: USB storage transfer size increase for xHCI

Marek Vasut
2015-08-13T19:09:02Z

On Thursday, August 13, 2015 at 09:00:04 PM, Sergey Temerkhanov wrote:
> Increase xHCI transfer size for USB storage devices. This helps to
> achieve 10-20x speedup for large transfers
>
> Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
> Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>

Hi!

> ---
>
> common/usb_storage.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/common/usb_storage.c b/common/usb_storage.c
> index b978430..ee5acca 100644
> --- a/common/usb_storage.c
> +++ b/common/usb_storage.c
> @@ -97,13 +97,15 @@ struct us_data {
> trans_cmnd transport; /* transport routine */
> };
>
> -#ifdef CONFIG_USB_EHCI
> +#if defined(CONFIG_USB_EHCI)
> /*
> * The U-Boot EHCI driver can handle any transfer length as long as there
> is * enough free heap space left, but the SCSI READ(10) and WRITE(10)
> commands are * limited to 65535 blocks.
> */
> #define USB_MAX_XFER_BLK 65535
> +#elif defined(CONFIG_USB_XHCI)

Why don't you keep the XHCI consistent with EHCI, ie 64k transfers as well ?

> +#define USB_MAX_XFER_BLK 4096
> #else
> #define USB_MAX_XFER_BLK 20
> #endif

Best regards,
Marek Vasut