linux-kernel - Re: [PATCH v3 19/19] usb: dwc3: add support for AMD NL platform

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Date:	Tue, 28 Oct 2014 22:35:37 +0800
From:	Huang Rui <ray.huang@....com>
To:	Felipe Balbi <balbi@...com>
CC:	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>,
	Jason Chang <jason.chang@....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 v3 19/19] usb: dwc3: add support for AMD NL platform

On Tue, Oct 28, 2014 at 08:38:56AM -0500, Felipe Balbi wrote:
> Hi,
> 
> almost there...
> 
> On Tue, Oct 28, 2014 at 07:54:40PM +0800, Huang Rui wrote:
> > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> > index 8b94ad5..b08a2f9 100644
> > --- a/drivers/usb/dwc3/core.h
> > +++ b/drivers/usb/dwc3/core.h
> > @@ -699,6 +699,7 @@ struct dwc3_scratchpad_array {
> >   * @rx_detect_poll_quirk: set if we enable rx_detect to polling lfps quirk
> >   * @dis_u3_susphy_quirk: set if we disable usb3 suspend phy
> >   * @dis_u2_susphy_quirk: set if we disable usb2 suspend phy
> > + * @amd_nl_plat: set if we use AMD NL platform
> 
> however, as I mentioned before, the core shouldn't have to know that
> it's running on an AMD platform. We already support several different
> platforms (OMAP5, AM437x, DRA7xx, Exynos5, Exynos7, Qcom, Merrifield,
> Baytrail, Braswell, HAPS PCIe, and STiH407) and none of them get their
> $my_awesome_platform flag in dwc3, why should AMD be any different ?
> 
> This is the only part of $subject that I cannot accept because it would
> mean we would be giving AMD a special treatment when there shouldn't be
> any, for anybody.
> 

That's because I used this flag to enable below quirks on AMD NL FPGA
board, and FPGA flag only can be detected on core. Can I set
disable_scramble_quirk, dis_u3_susphy_quirk, and dis_u2_susphy_quirk
for all the FPGA platforms?

if (dwc->amd_nl_plat && dwc->is_fpga) {
        dwc->disable_scramble_quirk = true;
        dwc->dis_u3_susphy_quirk = true;
        dwc->dis_u2_susphy_quirk = true;
}

Thanks,
Rui
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