linux-kernel - Re: [RFC 2/2] usb: dwc3: Add Qualcomm DWC3 glue layer driver

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Date:	Mon, 12 Aug 2013 13:24:39 -0500
From:	Felipe Balbi <balbi@...com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	<balbi@...com>, <rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ian.campbell@...rix.com>, <rob@...dley.net>,
	<gregkh@...uxfoundation.org>, <grant.likely@...aro.org>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [RFC 2/2] usb: dwc3: Add Qualcomm DWC3 glue layer driver

On Fri, Aug 09, 2013 at 07:09:18PM +0300, Ivan T. Ivanov wrote:
> Hi, 
> 
> On Fri, 2013-08-09 at 16:23 +0300, Felipe Balbi wrote:
> > Hi,
> > 
> > On Tue, Aug 06, 2013 at 02:53:11PM +0300, Ivan T. Ivanov wrote:
> > > diff --git a/drivers/usb/dwc3/dwc3-msm.c b/drivers/usb/dwc3/dwc3-msm.c
> > > new file mode 100644
> > > index 0000000..e509abc
> > > --- /dev/null
> > > +++ b/drivers/usb/dwc3/dwc3-msm.c
> > > @@ -0,0 +1,175 @@
> > > +#undef CONFIG_REGULATOR
> > 
> > why ??????
> > 
> 
> 1. This shows that driver is still not fully tested 
>    Regulators support is still missing in the MSM
> 2. Helps me to load driver successfully. 

Then remove all the regulator-related code from this.

> > > +	clk_prepare_enable(mdwc->core_clk);
> > > +	clk_prepare_enable(mdwc->iface_clk);
> > > +	clk_prepare_enable(mdwc->sleep_clk);
> > > +	clk_prepare_enable(mdwc->utmi_clk);
> > 
> > do you really need to enable your clocks here ? Why don't you enable
> > them on runtime_resume and disable on runtime_suspend ?
> 
> I will like to make it working first and then will improve
> power management.

alright, makes sense.

> > > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > +	tcsr = devm_ioremap_resource(&pdev->dev, res);
> > > +	if (!tcsr) {
> > > +		dev_dbg(&pdev->dev, "tcsr ioremap failed\n");
> > 
> > no need to ioremap, also you're likely leaking clocks and regulators
> > enabled here.
> > 
> > Make sure to have something like:
> > 
> > 	if (!tcsr)
> > 		goto err_disable_clocks;
> > 
> > 	/* TODO This has to be revised */\
> > 
> > 	[...]
> > 
> 
> Sure.

just to make it clear, I meant to say that you don't need to print the
error message :-)

-- 
balbi

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