linux-kernel - Re: [PATCH V5 09/12] usb: xhci: Add NVIDIA Tegra xHCI host-controller driver

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Date:	Tue, 18 Nov 2014 09:12:58 -0800
From:	Andrew Bresticker <abrestic@...omium.org>
To:	balbi@...com
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Kishon Vijay Abraham I <kishon@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH V5 09/12] usb: xhci: Add NVIDIA Tegra xHCI host-controller driver

On Mon, Nov 17, 2014 at 4:33 PM, Felipe Balbi <balbi@...com> wrote:
>> >> +static int tegra_xhci_load_firmware(struct tegra_xhci_hcd *tegra)
>> >> +{
>> >> +     struct device *dev = tegra->dev;
>> >> +     struct tegra_xhci_fw_cfgtbl *cfg_tbl;
>> >> +     struct tm fw_tm;
>> >> +     u32 val, code_tag_blocks, code_size_blocks;
>> >> +     u64 fw_base;
>> >> +     time_t fw_time;
>> >> +     unsigned long timeout;
>> >> +
>> >> +     if (csb_readl(tegra, XUSB_CSB_MP_ILOAD_BASE_LO) != 0) {
>> >> +             dev_info(dev, "Firmware already loaded, Falcon state 0x%x\n",
>> >> +                      csb_readl(tegra, XUSB_FALC_CPUCTL));
>> >> +             return 0;
>> >> +     }
>> >
>> > won't this prevent rmmod && insmod from succeeding ? Maybe not, as you
>> > return 0 anyway, but if the firmware side craps out, it might be useful
>> > to reload the firmware and reset that block. I wonder if this prevents
>> > that.
>>
>> rmmod && insmod does work with the above since, as you mentioned, we
>> return successfully if the controller is already running.  Attempting
>> to re-load the firmware if the controller is already running won't
>> work - it requires a full power-gate/ungate sequence of the
>> controller.  Unfortunately, that sequence is rather complicated and I
>> haven't had a chance to implement it yet.  it will hopefully be coming
>> later, though.
>
> Alright, could you add a comment on the source code stating that ?
> Perhaps a REVISIT note or FIXME ?

Sure, will do.
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