[U-Boot] [RFC PATCH v2] MLK-12883 usb: limit USB_MAX_XFER_BLK to 256

[Tom Rini <trini@konsulko.com>]

On Tue, Apr 09, 2019 at 05:20:45PM +0200, Marcel Ziswiler wrote:

> From: Peng Fan <peng.fan@nxp.com>
> 
> For Some USB mass storage devices, such as:
> "
>  - Kingston DataTraveler 2.0 001D7D06CF09B04199C7B3EA
>  - Class: (from Interface) Mass Storage
>  - PacketSize: 64  Configurations: 1
>  - Vendor: 0x0930  Product 0x6545 Version 1.16
> "
> When `usb read 0x80000000 0 0x2000`, we met
> "EHCI timed out on TD - token=0x80008d80".
> 
> The devices does not support scsi VPD page, we are not able
> to get the maximum transfer length for READ(10)/WRITE(10).
> 
> So we limit this to 256 blocks as READ(6).
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
> (cherry picked from commit df0052575b2bc9d66ae73584768e1a457ed5d914)
> 
> ---
> This comes from NXP's downstream and has proven to tremendously improve
> the situation with those odd USB mass storage aka memory sticks. This is
> why I post it here asking whether or not this may be something
> benefiting more people. Any feedback and suggestions are welcome.
> 
> Changes in v2:
> - Fixed spelling in comment as suggested by Igor.
> 
>  common/usb_storage.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/common/usb_storage.c b/common/usb_storage.c
> index 8c889bb1a6..4e284645f5 100644
> --- a/common/usb_storage.c
> +++ b/common/usb_storage.c
> @@ -949,7 +949,11 @@ static void usb_stor_set_max_xfer_blk(struct usb_device *udev,
>  	 * there is enough free heap space left, but the SCSI READ(10) and
>  	 * WRITE(10) commands are limited to 65535 blocks.
>  	 */
> -	blk = USHRT_MAX;
> +	/*
> +	 * Some USB mass storage devices have issues, limiting this to 256
> +	 * fixes this.
> +	 */
> +	blk = 256;
>  #else
>  	blk = 20;
>  #endif
> -- 
> 2.20.1

Adding in Lukasz now that get_maintainers.pl shows this should be Cc'd to
him as well, thanks!

-- 
Tom
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