Re: [PATCH 3/3] msm: iommu: Rework clock logic and add IOMMU busclock control

[Stepan Moskovchenko]

On 11/22/2010 3:51 PM, Daniel Walker wrote:
> On Fri, 2010-11-19 at 19:02 -0800, Stepan Moskovchenko wrote:
> > Clean up the clock control code in the probe calls, and add
> > support for controlling the clock for the IOMMU bus
> > interconnect. With the (proper) clock driver in place, the
> > clock control logic in the probe function can be made much
> > cleaner since it does not have to deal with the placeholder
> > driver anymore.
> >
> > Change-Id: I1040bc4e18f4ab4b7cc0dd5fe667f9df83b9f1f5
> You need to remove this Change-Id ..
Fixed in v2.

> > +		pr_err("Could not request memory region: start=%p, len=%d\n",
> > +							(void *) r->start, len);(void *) r->start, len);
> You usually just tab over till you get to the " like this,
>
> pr_err("Could not request memory region: start=%p, len=%d\n",
> 	(void *) r->start, len);
Fixed in v2.

> >   	drv = platform_get_drvdata(pdev);
> >   	if (drv) {
> > -		memset(drv, 0, sizeof(struct msm_iommu_drvdata));
> > +		if (drv->clk)
> > +			clk_put(drv->clk);
> > +		clk_put(drv->pclk);
> > +		memset(drv, 0, sizeof(*drv));
> Do you really need the memset ?
I guess not.. it seemed like good practice to poison the memory in case 
someone else had a stale reference to it. I guess I can remove them.

> > +	if (ret)
> > +		goto fail;
> > +
> > +	if (drvdata->clk) {
> > +		ret = clk_enable(drvdata->clk);
> > +		if (ret) {
> > +			clk_disable(drvdata->pclk);
> > +			goto fail;
> > +		}
> > +	}
> You did this in a prior patch also, you could combine them into a single
> helper function. Maybe do the same for the disable side too.
That was in a different file (where it gets used much more extensively 
than just in the one case here). I would rather not make a bunch of my 
internal stuff visible to the global namespace if I can help it, and 
it's a trivial enough operation to enable two clocks.

I will send out v2 in a few minutes.

Steve

---

 Sent by an employee of the Qualcomm Innovation Center, Inc.
 The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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