From: Felipe Balbi <balbi@ti.com>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Felipe Balbi <balbi@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Baolu Lu <baolu.lu@linux.intel.com>, <linux-usb@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 6/8] usb: dwc3: add ULPI interface support
Date: Mon, 26 Jan 2015 13:35:28 -0600 [thread overview]
Message-ID: <20150126193528.GF6660@saruman.tx.rr.com> (raw)
In-Reply-To: <20150126114610.GA28539@kuha.fi.intel.com>
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On Mon, Jan 26, 2015 at 01:46:10PM +0200, Heikki Krogerus wrote:
> On Fri, Jan 23, 2015 at 10:24:43AM -0600, Felipe Balbi wrote:
> > On Fri, Jan 23, 2015 at 05:12:56PM +0200, Heikki Krogerus wrote:
> > > +int dwc3_ulpi_init(struct dwc3 *dwc)
> > > +{
> > > + u32 reg;
> > > +
> > > + /* First check USB2 PHY interface type */
> > > + switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
> > > + case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
> > > + /* Select ULPI Interface */
> > > + reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> > > + reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
> > > + dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> > > + /* FALLTHROUGH */
> > > + case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
> > > + break;
> > > + default:
> > > + return 0;
> > > + }
> > > +
> > > + /* Register the interface */
> > > + dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi);
> > > + if (IS_ERR(dwc->ulpi)) {
> >
> > so, this will only build and link if DWC3_ULPI is enabled, in case of
> > error you return early...
> >
> > > + dev_err(dwc->dev, "failed to register ULPI interface");
> > > + return PTR_ERR(dwc->ulpi);
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +void dwc3_ulpi_exit(struct dwc3 *dwc)
> > > +{
> > > + if (dwc->ulpi) {
> >
> > ... looks like this branch is unnecessary.
>
> We can't do that, or distros that select DWC3_ULPI option can only use
> dwc3 with hardware that really has ULPI PHY. So I guess we'll drop the
> DWC3_ULPI option and build the dwc3 ulpi support always if ULPI bus is
> enabled. OK?
look at your patch again. In case DWC3_ULPI isn't enabled, this file
won't be linked at all. You're using stubs, so taht's fine.
In case it _is_ enabled, you're breaking out early if you can't register
ulpi interface, meaning you're exitting probe() (which, in fact, seems
wrong as I want to be able to run dwc3 with ULPI enabled on a platform
that was configured with ULPI+UTMI, but uses UTMI PHY).
I still think this patch won't work in all cases.
--
balbi
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next prev parent reply other threads:[~2015-01-26 19:35 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-23 15:12 [PATCH 0/8] usb: ulpi bus Heikki Krogerus
2015-01-23 15:12 ` [PATCH 1/8] usb: add bus type for USB ULPI Heikki Krogerus
2015-01-29 5:02 ` Felipe Balbi
2015-01-29 14:18 ` Heikki Krogerus
2015-02-13 1:44 ` Stephen Boyd
2015-02-13 11:24 ` Heikki Krogerus
2015-01-23 15:12 ` [PATCH 2/8] usb: dwc3: USB2 PHY register access bits Heikki Krogerus
2015-01-23 15:12 ` [PATCH 3/8] usb: dwc3: store driver data earlier Heikki Krogerus
2015-01-23 15:12 ` [PATCH 4/8] usb: dwc3: cache hwparams earlier Heikki Krogerus
2015-01-23 15:12 ` [PATCH 5/8] usb: dwc3: ULPI or UTMI+ select Heikki Krogerus
2015-01-23 15:12 ` [PATCH 6/8] usb: dwc3: add ULPI interface support Heikki Krogerus
2015-01-23 16:24 ` Felipe Balbi
2015-01-26 11:46 ` Heikki Krogerus
2015-01-26 19:35 ` Felipe Balbi [this message]
2015-01-27 11:09 ` Heikki Krogerus
2015-01-27 15:24 ` Felipe Balbi
2015-02-11 19:34 ` David Cohen
2015-02-12 12:12 ` Heikki Krogerus
2015-02-13 1:41 ` David Cohen
2015-02-13 1:54 ` David Cohen
2015-02-13 13:16 ` Heikki Krogerus
2015-02-13 22:03 ` David Cohen
2015-02-13 22:04 ` Felipe Balbi
2015-01-23 15:12 ` [PATCH 7/8] phy: helpers for USB ULPI PHY registering Heikki Krogerus
2015-01-29 5:03 ` Felipe Balbi
2015-01-29 14:34 ` Heikki Krogerus
2015-01-29 16:11 ` Felipe Balbi
2015-01-30 10:33 ` Heikki Krogerus
2015-01-30 16:03 ` Felipe Balbi
2015-01-23 15:12 ` [PATCH 8/8] phy: add driver for TI TUSB1210 ULPI PHY Heikki Krogerus
2015-01-24 23:58 ` David Cohen
2015-01-26 12:55 ` Heikki Krogerus
2015-01-26 19:23 ` David Cohen
2015-01-27 9:28 ` Heikki Krogerus
2015-01-27 12:57 ` Heikki Krogerus
2015-01-27 17:38 ` David Cohen
2015-01-28 14:20 ` Heikki Krogerus
2015-01-28 18:02 ` David Cohen
2015-01-29 14:14 ` Heikki Krogerus
2015-01-29 16:20 ` Felipe Balbi
2015-01-29 18:02 ` David Cohen
2015-01-30 12:18 ` Heikki Krogerus
2015-01-30 16:09 ` David Cohen
2015-02-02 12:50 ` Heikki Krogerus
2015-01-30 9:29 ` Heikki Krogerus
2015-01-30 16:14 ` Felipe Balbi
2015-01-30 16:25 ` David Cohen
2015-01-30 16:30 ` Felipe Balbi
2015-01-30 16:20 ` David Cohen
2015-01-30 16:33 ` Felipe Balbi
2015-02-02 12:59 ` Heikki Krogerus
2015-02-03 11:37 ` Heikki Krogerus
2015-02-10 18:33 ` David Cohen
2015-02-10 19:05 ` David Cohen
2015-02-10 19:23 ` David Cohen
2015-02-11 13:12 ` Heikki Krogerus
2015-02-11 19:36 ` David Cohen
2015-02-13 22:02 ` David Cohen
2015-02-13 22:03 ` Felipe Balbi
2015-02-13 22:13 ` David Cohen
2015-01-29 5:09 ` Felipe Balbi
2015-01-29 14:30 ` Heikki Krogerus
2015-01-29 16:20 ` Felipe Balbi
2015-01-29 18:04 ` David Cohen
2015-01-29 18:25 ` David Cohen
2015-01-29 18:47 ` David Cohen
2015-01-30 10:30 ` Heikki Krogerus
2015-02-13 1:52 ` David Cohen
2015-02-13 12:35 ` Heikki Krogerus
2015-02-13 16:01 ` Felipe Balbi
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