linux-kernel - Re: [PATCH] Revert "usb: cdns3: core: quit if it uses role switch class"

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Date:   Tue, 24 Nov 2020 06:43:12 +0000
From:   Peter Chen <peter.chen@....com>
To:     Roger Quadros <rogerq@...com>
CC:     "pawell@...ence.com" <pawell@...ence.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "usb: cdns3: core: quit if it uses role switch
 class"

On 20-11-23 13:50:51, Roger Quadros wrote:
> This reverts commit 50642709f6590fe40afa6d22c32f23f5b842aed5.
> 
> This commit breaks hardware based role switching on TI platforms.
> cdns->role_sw is always going to be non-zero as it is a pointer
> to the usb_role_switch instance. Some other means needs to be used
> if hardware based role switching is not required by the platform.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/usb/cdns3/core.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> index a0f73d4711ae..4c1445cf2ad0 100644
> --- a/drivers/usb/cdns3/core.c
> +++ b/drivers/usb/cdns3/core.c
> @@ -280,10 +280,6 @@ int cdns3_hw_role_switch(struct cdns3 *cdns)
>  	enum usb_role real_role, current_role;
>  	int ret = 0;
>  
> -	/* Depends on role switch class */
> -	if (cdns->role_sw)
> -		return 0;
> -
>  	pm_runtime_get_sync(cdns->dev);
>  
>  	current_role = cdns->role;
> -- 

Hi Roger,

I am sorry about that. Do you use role switch /sys entry, if you have
used, I prefer using "usb-role-switch" property at dts to judge if
SoC OTG signals or external signals for role switch. If you have not
used it, I prefer only setting cdns->role_sw for role switch use cases.

-- 

Thanks,
Peter Chen