linux-kernel - Re: [PATCH] usb: cdns3: Fix hardware based role switch

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Message-ID: <520dd6e0-d3d4-b471-6c65-143e094a4f74@ti.com>
Date:   Fri, 27 Nov 2020 11:30:09 +0200
From:   Roger Quadros <rogerq@...com>
To:     <peter.chen@....com>, <pawell@...ence.com>
CC:     <heikki.krogerus@...ux.intel.com>, <gregkh@...uxfoundation.org>,
        <balbi@...nel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: cdns3: Fix hardware based role switch

Hi Peter,

On 25/11/2020 14:49, Roger Quadros wrote:
> Hardware based role switch is broken as the driver always skips it.
> Fix this by registering for  SW role switch only if 'usb-role-switch'
> property is present in the device tree.
> 
> Fixes: 50642709f659 ("usb: cdns3: core: quit if it uses role switch class")
> Signed-off-by: Roger Quadros <rogerq@...com>

Can you please pick this up for -rc cycle, else otg will be broken for us in v5.10 release.
Thanks.

cheers,
-roger

> ---
>   drivers/usb/cdns3/core.c | 27 +++++++++++++++------------
>   1 file changed, 15 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> index a0f73d4711ae..170deb3eacf0 100644
> --- a/drivers/usb/cdns3/core.c
> +++ b/drivers/usb/cdns3/core.c
> @@ -427,7 +427,6 @@ static irqreturn_t cdns3_wakeup_irq(int irq, void *data)
>    */
>   static int cdns3_probe(struct platform_device *pdev)
>   {
> -	struct usb_role_switch_desc sw_desc = { };
>   	struct device *dev = &pdev->dev;
>   	struct resource	*res;
>   	struct cdns3 *cdns;
> @@ -529,18 +528,21 @@ static int cdns3_probe(struct platform_device *pdev)
>   	if (ret)
>   		goto err2;
>   
> -	sw_desc.set = cdns3_role_set;
> -	sw_desc.get = cdns3_role_get;
> -	sw_desc.allow_userspace_control = true;
> -	sw_desc.driver_data = cdns;
> -	if (device_property_read_bool(dev, "usb-role-switch"))
> +	if (device_property_read_bool(dev, "usb-role-switch")) {
> +		struct usb_role_switch_desc sw_desc = { };
> +
> +		sw_desc.set = cdns3_role_set;
> +		sw_desc.get = cdns3_role_get;
> +		sw_desc.allow_userspace_control = true;
> +		sw_desc.driver_data = cdns;
>   		sw_desc.fwnode = dev->fwnode;
>   
> -	cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
> -	if (IS_ERR(cdns->role_sw)) {
> -		ret = PTR_ERR(cdns->role_sw);
> -		dev_warn(dev, "Unable to register Role Switch\n");
> -		goto err3;
> +		cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
> +		if (IS_ERR(cdns->role_sw)) {
> +			ret = PTR_ERR(cdns->role_sw);
> +			dev_warn(dev, "Unable to register Role Switch\n");
> +			goto err3;
> +		}
>   	}
>   
>   	if (cdns->wakeup_irq) {
> @@ -582,7 +584,8 @@ static int cdns3_probe(struct platform_device *pdev)
>   	return 0;
>   err4:
>   	cdns3_drd_exit(cdns);
> -	usb_role_switch_unregister(cdns->role_sw);
> +	if (cdns->role_sw)
> +		usb_role_switch_unregister(cdns->role_sw);
>   err3:
>   	set_phy_power_off(cdns);
>   err2:
> 

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