From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bk9at-0003Jw-Um for barebox@lists.infradead.org; Wed, 14 Sep 2016 12:47:16 +0000 Date: Wed, 14 Sep 2016 14:46:53 +0200 From: Sascha Hauer Message-ID: <20160914124653.aqwpfbaptk2wj43z@pengutronix.de> References: <1473775689-8969-1-git-send-email-s.hauer@pengutronix.de> <20160914111114.GA15884@ravnborg.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20160914111114.GA15884@ravnborg.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH] ARM: i.MX6: Enable parent propagation for clk_gate2 To: Sam Ravnborg Cc: Barebox List 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 -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox