linux-kernel - Re: [PATCH 3/3] msm: iommu: Rework clock logic and add IOMMU bus clock control

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Date:	Mon, 22 Nov 2010 19:06:20 -0800
From:	Stepan Moskovchenko <stepanm@...eaurora.org>
To:	Daniel Walker <dwalker@...eaurora.org>
CC:	davidb@...eaurora.org, bryanh@...eaurora.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] msm: iommu: Rework clock logic and add IOMMU bus
 clock control

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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