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

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Date:	Wed, 30 Mar 2016 17:08:29 +0200
From:	Przemek Rudy <prudy1@...pl>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	John Youn <John.Youn@...opsys.com>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc2: do not override forced dr_mode in gadget setup

On 03/30/2016 12:15 PM, Felipe Balbi wrote:
> 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 ?
> 
Technically - patch was started against 4.5, as there are no conflict changes around the file it fits for 4.6, 4.7.