linux-kernel - RE: [PATCH] arm:da850: register musb device

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Date:	Wed, 14 Mar 2012 06:16:54 +0000
From:	"Manjunathappa, Prakash" <prakash.pm@...com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
CC:	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Gupta, Ajay Kumar" <ajay.gupta@...com>,
	"Nori, Sekhar" <nsekhar@...com>
Subject: RE: [PATCH] arm:da850: register musb device

Hi Sergei,

On Tue, Mar 13, 2012 at 22:40:41, Sergei Shtylyov wrote:
> On 03/13/2012 06:03 PM, Manjunathappa, Prakash wrote:
> 
> > Properly set up the OTG mode thru the CFGCHIP2 register, enable the
> > USB0_DRVVBUS pin,
> 
>     I don't see where you are enabling it.
> 

Yes, I will correct the message.

> > and finally register the MUSB platform device.
> >
> > Signed-off-by: Ajay Kumar Gupta<ajay.gupta@...com>
> > Signed-off-by: Manjunathappa, Prakash<prakash.pm@...com>
> > ---
> > Patche are on top below posted patches:
> > http://www.spinics.net/lists/linux-usb/msg59656.html
> 
> >   arch/arm/mach-davinci/board-da850-evm.c |   12 ++++++++++++
> >   arch/arm/mach-davinci/usb.c             |    9 +++++++++
> >   2 files changed, 21 insertions(+), 0 deletions(-)
> 
> > diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
> > index 178d178..539e12c 100644
> > --- a/arch/arm/mach-davinci/board-da850-evm.c
> > +++ b/arch/arm/mach-davinci/board-da850-evm.c
> > @@ -787,6 +787,18 @@ static __init void da850_evm_usb_init(void)
> >   	 */
> >   	cfgchip2&= ~CFGCHIP2_USB1PHYCLKMUX;
> >   	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
> > +	/*
> > +	 * We have to override VBUS/ID signals when MUSB is configured into the
> > +	 * host-only mode -- ID pin will float if no cable is connected, so the
> > +	 * controller won't be able to drive VBUS thinking that it's a B-device.
> > +	 * Otherwise, we want to use the OTG mode and enable VBUS comparators.
> > +	 */
> > +	cfgchip2 &= ~CFGCHIP2_OTGMODE;
> > +#if CONFIG_USB_MUSB_DA8XX
> 
>     This #ifdef doesn't make sense. It will make driver always work in host mode.
> 

I will change it to support OTG.

> > +	cfgchip2 |=  CFGCHIP2_FORCE_HOST;
> > +#else
> > +	cfgchip2 |=  CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN;
> 
>     This is what you need to leave. The driver should always work in OTG mode now.
> 

Correct, I will fix this.

> > +#endif
> >
> >   	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
> >
> > diff --git a/arch/arm/mach-davinci/usb.c b/arch/arm/mach-davinci/usb.c
> > index 25c3520..a941dc5 100644
> > --- a/arch/arm/mach-davinci/usb.c
> > +++ b/arch/arm/mach-davinci/usb.c
> > @@ -284,6 +284,15 @@ void __init da8xx_board_usb_init(const short pins[],
> >   		goto usb11_setup_fail;
> >   	}
> >
> > +	/*
> > +	 * TPS2065 switch @ 5V supplies 1 A (sustains 1.5 A),
> > +	 * with the power on to power good time of 3 ms.
> > +	 */
> > +	ret = da8xx_register_usb20(1000, 3);
> > +	if (ret)
> > +		pr_warning("%s: USB 2.0 registration failed: %d\n",
> > +			   __func__, ret);
> 
>     Er, why this code is moved there? And how will this work on DA830 -- try to 
> register MUSB twice? Place this in the board file please where it belongs.
> 

Yes, I will revert this change.

Thanks,
Prakash

> WBR, Sergei
> 

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