[RFC 6/9] clk: ti: add support for omap4 module clocks

[Russell King - ARM Linux]

On Mon, Jan 04, 2016 at 03:27:57PM +0200, Tero Kristo wrote:
> On 01/04/2016 12:21 PM, Geert Uytterhoeven wrote:
> >FWIW, there are small loops with just a cpu_relax() in various clock drivers
> >under drivers/clk/shmobile/.
> 
> Just did a quick profiling round, and the clk_enable/disable delay loops
> take anything from 0...1500ns, most typically consuming some 400-600ns. So,
> based on this, dropping the udelay and adding cpu_relax instead looks like a
> good change. I just verified that changing the udelay to cpu_relax works
> fine also, I just need to change the bail-out period to be something sane.

Was that profiling done with lockdep/lock debugging enabled or disabled?

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