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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1grJNQ-0004nP-Du; Wed, 06 Feb 2019 09:20:16 +0000 Received: from relay1-d.mail.gandi.net ([217.70.183.193]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1grJNM-0004mx-IG for linux-arm-kernel@lists.infradead.org; Wed, 06 Feb 2019 09:20:14 +0000 X-Originating-IP: 90.88.22.177 Received: from localhost (aaubervilliers-681-1-80-177.w90-88.abo.wanadoo.fr [90.88.22.177]) (Authenticated sender: maxime.ripard@bootlin.com) by relay1-d.mail.gandi.net (Postfix) with ESMTPSA id BC586240075; Wed, 6 Feb 2019 09:20:00 +0000 (UTC) Date: Wed, 6 Feb 2019 10:20:00 +0100 From: Maxime Ripard To: Chen-Yu Tsai Subject: Re: [RFC PATCH] clk: sunxi-ng: sun4i: Use CLK_SET_RATE_PARENT for mmc2 clock Message-ID: <20190206092000.f46nsn4fw2n4crub@flea> References: <20190202155209.31617-1-plaes@plaes.org> <20190205094529.t7je4ozzu2b4ornc@flea> MIME-Version: 1.0 In-Reply-To: User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190206_012012_912978_732B12B3 X-CRM114-Status: GOOD ( 20.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jernej Skrabec , Priit Laes , Stephen Boyd , Michael Turquette , linux-kernel , linux-clk , linux-arm-kernel Content-Type: multipart/mixed; boundary="===============7991006909886842069==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============7991006909886842069== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="sl7pkaf3p7ikf3a2" Content-Disposition: inline --sl7pkaf3p7ikf3a2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Feb 05, 2019 at 09:44:02PM +0800, Chen-Yu Tsai wrote: > On Tue, Feb 5, 2019 at 5:45 PM Maxime Ripard = wrote: > > > > On Sat, Feb 02, 2019 at 05:52:09PM +0200, Priit Laes wrote: > > > Recent patch of improving MP clock rate calculations by taking > > > into account whether adjusting parent rate is allowed, have > > > unfortunately broken eMMC support on A20 Olinuxino-Lime2-eMMC > > > boards which fail with following error: > > > > > > [snip] > > > EXT4-fs (mmcblk1p4): INFO: recovery required on readonly filesystem > > > EXT4-fs (mmcblk1p4): write access will be enabled during recovery > > > sunxi-mmc 1c11000.mmc: data error, sending stop command > > > sunxi-mmc 1c11000.mmc: send stop command failed > > > [/snip] > > > > > > Previously, mmc2 clock was requesting 520MHz and settling at 512MHz > > > clock rate with following parents: >=20 > You mean 52 and 51.2 MHz. >=20 > > > [snip] > > > pll-ddr-base 2 2 0 768000000 0 0 50000 > > > pll-ddr-other 1 1 0 768000000 0 0 50000 > > > mmc2 0 0 0 51200000 0 0 50000 > > > [/snip] > > > > > > Now, after the improvements, requested and settled rate are both > > > 520MHz, but as mmc2 clock cannot adjust parent rate, the situation > > > ends up like this: > > > [snip] > > > pll-periph-base 3 3 0 1200000000 0 0 50000 > > > pll-periph 6 6 0 600000000 0 0 50000 > > > mmc2 3 3 0 50000000 0 0 50000 > > > [/snip] > > > > > > With this patch (allowing mmc2 to set parent rate), we end up with > > > working tree with both mmc0 (sd-card) and mmc2 (eMMC) working: > > > [snip] > > > pll-periph-base 3 3 0 312000000 0 0 50000 > > > mbus 1 1 0 78000000 0 0 50000 > > > pll-periph-sata 1 1 0 26000000 0 0 50000 > > > sata 1 1 0 26000000 0 0 50000 > > > pll-periph 5 5 0 156000000 0 0 50000 > > > mmc2 0 0 0 52000000 0 0 50000 > > > mmc0 0 0 0 39000000 0 0 50000 > > > [/snip] > > > > > > Fixes: 3f790433c3cb ("clk: sunxi-ng: Adjust MP clock parent rate when= allowed") > > > Signed-off-by: Priit Laes > > > > Applied, thanks! > > Maxime >=20 > I'm concerned for other users of the PLL-PERIPH clock. AFAIK > all of them, except the HRTIMER, expect the clock rate to stay > the same and not change underneath them. And SATA expects it to > be at 600 MHz, as the datasheet says. And while it may not directly > apply to the LIME2, eMMC on newer SoCs / boards run at the slightly > reduced rate of 50 MHz just fine. >=20 > In the commit in question, clocks without CLK_SET_RATE_PARENT > should be using the old code (now in the if conditional block), > i.e. the behavior should not have changed. >=20 > I don't think this actually "fixes" whatever bug was introduced, > but only papers over the issue, and possible introduces further > issues for other users. You're right, I've overlooked that it was pll-periph being affected. I've dropped it for now. Maxime --=20 Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --sl7pkaf3p7ikf3a2 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCXFqmvwAKCRDj7w1vZxhR xSw7AQDHxqxuEw37JOpF6w0RMseJfomBli6NRTUeA+PWrP5ymAD+KJFoB88BMXPP 9BMD/2yvAg8+f+AtitKtK8nYtlhzVgM= =Hlbo -----END PGP SIGNATURE----- --sl7pkaf3p7ikf3a2-- --===============7991006909886842069== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============7991006909886842069==--