linux-kernel - Re: [PATCH v2 06/16] usb: dwc3: add disscramble quirk

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Date:	Fri, 24 Oct 2014 10:26:28 -0500
From:	Felipe Balbi <balbi@...com>
To:	Huang Rui <ray.huang@....com>
CC:	Felipe Balbi <balbi@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paul Zimmerman <Paul.Zimmerman@...opsys.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Vincent Wan <vincent.wan@....com>, Tony Li <tony.li@....com>,
	<linux-usb@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/16] usb: dwc3: add disscramble quirk

On Mon, Oct 20, 2014 at 02:38:28PM +0800, Huang Rui wrote:
> On Fri, Oct 17, 2014 at 09:45:32AM -0500, Felipe Balbi wrote:
> > Hi,
> > 
> > On Fri, Oct 17, 2014 at 04:53:31PM +0800, Huang Rui wrote:
> > > AMD NL fpga needs to enable disscramble quirk. And this quirk doesn't need on
> > > the true soc.
> > > 
> > > Signed-off-by: Huang Rui <ray.huang@....com>
> > > ---
> > >  drivers/usb/dwc3/core.c          | 8 +++++++-
> > >  drivers/usb/dwc3/dwc3-pci.c      | 5 +++++
> > >  drivers/usb/dwc3/platform_data.h | 4 ++++
> > >  3 files changed, 16 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > > index 50c0eae..819e501 100644
> > > --- a/drivers/usb/dwc3/core.c
> > > +++ b/drivers/usb/dwc3/core.c
> > > @@ -422,7 +422,6 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > >  
> > >  	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > >  	reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
> > > -	reg &= ~DWC3_GCTL_DISSCRAMBLE;
> > >  
> > >  	switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
> > >  	case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
> > > @@ -461,6 +460,13 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > >  		dwc->is_fpga = true;
> > >  	}
> > >  
> > > +	if ((dwc->quirks & DWC3_QUIRK_AMD_NL) && dwc->is_fpga)
> > > +		dwc->quirks |= DWC3_QUIRK_DISSCRAMBLE;
> > > +
> > > +	if (dwc->quirks & DWC3_QUIRK_DISSCRAMBLE)
> > 
> > this should only be set if is_fpga, and this quirk should be a 1-bit
> > flag, so here's what you should do:
> > 
> > 	WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga,
> > 		"disable_scramble cannot be used on non-FPGA builds\n");
> > 
> > 	if (dwc->disable_scramble && dwc->is_fpga)
> > 		reg |= DWC3_GCTL_DISSCRAMBLE;
> > 	else
> > 		reg &= ~DWC3_GCTL_DISSCRAMBLE;
> > 
> 
> OK, will update it in V3.
> 
> > > +		reg |= DWC3_GCTL_DISSCRAMBLE;
> > > +	else
> > > +		reg &= ~DWC3_GCTL_DISSCRAMBLE;
> > 
> > add a blank line here, to aid readability.
> > 
> 
> OK, will add it.
> 
> > >  	/*
> > >  	 * WORKAROUND: DWC3 revisions <1.90a have a bug
> > >  	 * where the device can fail to connect at SuperSpeed
> > > diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
> > > index 18569a4..a89db6c 100644
> > > --- a/drivers/usb/dwc3/dwc3-pci.c
> > > +++ b/drivers/usb/dwc3/dwc3-pci.c
> > > @@ -146,6 +146,11 @@ static int dwc3_pci_probe(struct pci_dev *pci,
> > >  	res[1].name	= "dwc_usb3";
> > >  	res[1].flags	= IORESOURCE_IRQ;
> > >  
> > > +	if (pci->vendor == PCI_VENDOR_ID_AMD && pci->device ==
> > > +			PCI_DEVICE_ID_AMD_NL) {
> > > +		dwc3_pdata.quirks |= DWC3_QUIRK_AMD_NL;
> > > +	}
> > 
> > should be part of another patch and the quirk is
> > "disable_scramble_quirk", not AMD.
> > 
> 
> Got it, you would like to keep this patch just for fpga disscramble
> quirk and do not add any 3rd platform info, right?

right. So far only FPGA-based systems need this :-)

-- 
balbi

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