[PATCH] ARM: i.MX6: Enable parent propagation for clk_gate2

[Sascha Hauer]

On Wed, Sep 14, 2016 at 01:11:14PM +0200, Sam Ravnborg wrote:
> Hi Sascha.
> 
> On Tue, Sep 13, 2016 at 04:08:09PM +0200, Sascha Hauer wrote:
> > Enable parent rate propagation for clk_gate2 to allow the
> > clock consumers to adjust their rates.
> > One effect of this is that the i.MX6 NAND controller now can adjust
> > its rate. It already called a clk_set_rate(rate, 96000000), but this
> > had no effect, so the clock stayed at reset default 24MHz resulting
> > in a rather slow timing. This became a problem when commit
> > "1daa3bc mtd: nand_mxs: Setup timing" introduced EDO timing mode for
> > faster NAND chips. EDO mode can only work properly for cycle times
> > < 30ns (at least that's specified in the ONFI spec). 1daa3bc resulted
> > in sporadic NAND read errors on some boards.
> 
> Nice work!
> 
> We have tested this patch on ~10 boards that failed
> with DMA errors before.
> None of these boards failed after applying this patch.

Great :)

Have you noticed the NAND is much faster now?

Sascha

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