linux-kernel - Re: [PATCH] usb: dwc2: do not override forced dr

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Date:	Wed, 30 Mar 2016 13:15:10 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	John Youn <John.Youn@...opsys.com>, Przemek Rudy <prudy1@...pl>,
	"John.Youn\@synopsys.com" <John.Youn@...opsys.com>
Cc:	"gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc2: do not override forced dr_mode in gadget setup

John Youn <John.Youn@...opsys.com> writes:
> [ text/plain ]
> On 3/16/2016 3:10 PM, Przemek Rudy wrote:
>> The host/device mode set with dr_mode should be kept all the time,
>> not being changed to OTG in gadget setup (by overriding CFGUSB_FORCEDEVMODE
>> and CFGUSB_FORCEHOSTMODE bits).
>> 
>> Signed-off-by: Przemek Rudy <prudy1@...pl>
>> ---
>>  drivers/usb/dwc2/gadget.c | 23 ++++++++++++++++++-----
>>  1 file changed, 18 insertions(+), 5 deletions(-)
>> 
>> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
>> index e9940dd..818f158 100644
>> --- a/drivers/usb/dwc2/gadget.c
>> +++ b/drivers/usb/dwc2/gadget.c
>> @@ -2254,6 +2254,7 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
>>  {
>>  	u32 intmsk;
>>  	u32 val;
>> +	u32 usbcfg;
>>  
>>  	/* Kill any ep0 requests as controller will be reinitialized */
>>  	kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET);
>> @@ -2267,10 +2268,16 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
>>  	 * set configuration.
>>  	 */
>>  
>> +	/* keep other bits untouched (so e.g. forced modes are not lost) */
>> +	usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
>> +	usbcfg &= ~(GUSBCFG_TOUTCAL_MASK | GUSBCFG_PHYIF16 | GUSBCFG_SRPCAP |
>> +		GUSBCFG_HNPCAP);
>> +
>>  	/* set the PLL on, remove the HNP/SRP and set the PHY */
>>  	val = (hsotg->phyif == GUSBCFG_PHYIF8) ? 9 : 5;
>> -	dwc2_writel(hsotg->phyif | GUSBCFG_TOUTCAL(7) |
>> -	       (val << GUSBCFG_USBTRDTIM_SHIFT), hsotg->regs + GUSBCFG);
>> +	usbcfg |= hsotg->phyif | GUSBCFG_TOUTCAL(7) |
>> +		(val << GUSBCFG_USBTRDTIM_SHIFT);
>> +	dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
>>  
>>  	dwc2_hsotg_init_fifo(hsotg);
>>  
>> @@ -3031,6 +3038,7 @@ static struct usb_ep_ops dwc2_hsotg_ep_ops = {
>>  static void dwc2_hsotg_init(struct dwc2_hsotg *hsotg)
>>  {
>>  	u32 trdtim;
>> +	u32 usbcfg;
>>  	/* unmask subset of endpoint interrupts */
>>  
>>  	dwc2_writel(DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK |
>> @@ -3054,11 +3062,16 @@ static void dwc2_hsotg_init(struct dwc2_hsotg *hsotg)
>>  
>>  	dwc2_hsotg_init_fifo(hsotg);
>>  
>> +	/* keep other bits untouched (so e.g. forced modes are not lost) */
>> +	usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
>> +	usbcfg &= ~(GUSBCFG_TOUTCAL_MASK | GUSBCFG_PHYIF16 | GUSBCFG_SRPCAP |
>> +		GUSBCFG_HNPCAP);
>> +
>>  	/* set the PLL on, remove the HNP/SRP and set the PHY */
>>  	trdtim = (hsotg->phyif == GUSBCFG_PHYIF8) ? 9 : 5;
>> -	dwc2_writel(hsotg->phyif | GUSBCFG_TOUTCAL(7) |
>> -		(trdtim << GUSBCFG_USBTRDTIM_SHIFT),
>> -		hsotg->regs + GUSBCFG);
>> +	usbcfg |= hsotg->phyif | GUSBCFG_TOUTCAL(7) |
>> +		(trdtim << GUSBCFG_USBTRDTIM_SHIFT);
>> +	dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
>>  
>>  	if (using_dma(hsotg))
>>  		__orr32(hsotg->regs + GAHBCFG, GAHBCFG_DMA_EN);
>> 
>
>
> Acked-by: John Youn <johnyoun@...opsys.com>
> Tested-by: John Youn <johnyoun@...opsys.com>

I suppose this is for v4.7 merge window ?

-- 
balbi

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