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

Felipe Balbi
2014-10-24T15:26:53Z

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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@amd.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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