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From: Sam Ravnborg <sam@ravnborg.org>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH] ARM: i.MX6: Enable parent propagation for clk_gate2
Date: Wed, 14 Sep 2016 13:11:14 +0200	[thread overview]
Message-ID: <20160914111114.GA15884@ravnborg.org> (raw)
In-Reply-To: <1473775689-8969-1-git-send-email-s.hauer@pengutronix.de>

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.

> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sam Ravnborg <sam@ravnborg.org>

	Sam

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  reply	other threads:[~2016-09-14 11:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-13 14:08 Sascha Hauer
2016-09-14 11:11 ` Sam Ravnborg [this message]
2016-09-14 12:46   ` Sascha Hauer

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