linux-kernel - Re: [PATCH] USB: ohci-at91: fix PIO handling in relation with number of ports

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Date:	Tue, 4 Sep 2012 10:27:22 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	<stern@...land.harvard.edu>, <gregkh@...uxfoundation.org>
CC:	<linux-usb@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <plagnioj@...osoft.com>,
	<klaus.falkner@...ectrix.de>, <ludovic.desroches@...el.com>
Subject: Re: [PATCH] USB: ohci-at91: fix PIO handling in relation with number
 of ports

On 08/29/2012 11:49 AM, Nicolas Ferre :
> If the number of ports present on the SoC/board is not the maximum
> and that the platform data is not filled with all data, there is
> an easy way to mess the PIO setup for this interface.
> This quick fix addresses mis-configuration in USB host platform data
> that is common in at91 boards since commit 0ee6d1e (USB: ohci-at91:
> change maximum number of ports) that did not modified the associatd
> board files.
> 
> Reported-by: Klaus Falkner <klaus.falkner@...ectrix.de>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Cc: Stable <stable@...r.kernel.org> [3.4+]

Alan, Greg, gentle ping...

I really would like to seen it landing in stable soon...

Thanks, best regards,

> ---
>  drivers/usb/host/ohci-at91.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index a665b3e..aaa8d2b 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -570,6 +570,16 @@ static int __devinit ohci_hcd_at91_drv_probe(struct platform_device *pdev)
>  
>  	if (pdata) {
>  		at91_for_each_port(i) {
> +			/*
> +			 * do not configure PIO if not in relation with
> +			 * real USB port on board
> +			 */
> +			if (i >= pdata->ports) {
> +				pdata->vbus_pin[i] = -EINVAL;
> +				pdata->overcurrent_pin[i] = -EINVAL;
> +				break;
> +			}
> +
>  			if (!gpio_is_valid(pdata->vbus_pin[i]))
>  				continue;
>  			gpio = pdata->vbus_pin[i];
> 


-- 
Nicolas Ferre
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