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

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Message-ID: <20141017144532.GB26260@saruman>
Date:	Fri, 17 Oct 2014 09:45:32 -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

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;

> +		reg |= DWC3_GCTL_DISSCRAMBLE;
> +	else
> +		reg &= ~DWC3_GCTL_DISSCRAMBLE;

add a blank line here, to aid readability.

>  	/*
>  	 * 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.

-- 
balbi

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