[PATCH V2 05/19] bus: omap_l3_noc: switch over to relaxed variants of readl/writel

Nishanth Menon
2014-04-21T13:16:28Z

On 04/17/2014 05:03 PM, Felipe Balbi wrote:
> On Thu, Apr 17, 2014 at 05:56:15PM -0400, Santosh Shilimkar wrote:
>> On Thursday 17 April 2014 05:52 PM, Felipe Balbi wrote:
>>> Hi,
>>>
>>> On Thu, Apr 17, 2014 at 03:49:21PM -0500, Nishanth Menon wrote:
>>>> Currently we use __raw_readl and writel in this driver, however, there
>>>
>>> __raw_* and *_relaxed variants are the same, just have a look <asm/io.h>
>>>
>> Except the relaxed version can take care of endian conversion if
>> needed. :-)
>
> right, but according to commit log, this commit is more concerned about
> the memory barriers which writel()/readl() add, not endianness. Just a
> matter of fixing up commit log.
>

yep, this patch does replace writel with writel_relaxed there is no
strong need for barriers in the operations that we perform here.

I agree that the commit message should probably be a little more
detailed at this point.

How about:
Currently we use __raw_readl and writel in this driver. Considering
there is no specific need for a memory barrier, replacing writel with
endian-neutral writel_relaxed and replacing __raw_readls with the
corresponding endian-neutral readl_relaxed allows us to have a
standard set of register operations for the driver.

While at it, simplify address computation using variables for register.

--
Regards,
Nishanth Menon