Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753502AbbBSUsS (ORCPT ); Thu, 19 Feb 2015 15:48:18 -0500 Received: from bhuna.collabora.co.uk ([93.93.135.160]:38276 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752852AbbBSUsQ (ORCPT ); Thu, 19 Feb 2015 15:48:16 -0500 Message-ID: <54E64C09.5000505@collabora.co.uk> Date: Thu, 19 Feb 2015 21:48:09 +0100 From: Javier Martinez Canillas User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.2.0 MIME-Version: 1.0 To: =?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?= , Doug Anderson CC: alsa-devel@alsa-project.org, linux-samsung-soc , Sangbeom Kim , Liam Girdwood , Mark Brown , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , Vincent Palatin , Tomasz Figa , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala Subject: Re: [PATCH 1/6] ASoC: max98088: Document DT bindings References: <1424283959-16289-1-git-send-email-afaerber@suse.de> <1424283959-16289-2-git-send-email-afaerber@suse.de> <54E5EB36.9020007@collabora.co.uk> <54E5EF73.2090302@suse.de> <54E62E1C.4030105@suse.de> <54E6314E.5060509@suse.de> In-Reply-To: <54E6314E.5060509@suse.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3666 Lines: 91 Hello Andreas, We already talked over irc but for completeness I'll comment here as well. On 02/19/2015 07:54 PM, Andreas Färber wrote: > Am 19.02.2015 um 19:40 schrieb Andreas Färber: >> Am 19.02.2015 um 18:48 schrieb Doug Anderson: >>> On Thu, Feb 19, 2015 at 6:13 AM, Andreas Färber wrote: >>>>> I see that a master clock (mclk) is added in patch 6/6 but the >>>>> max98088 codec driver does handle this clock. Sorry, I wanted to say " the driver *does not* handle this clock" but fortunately you understood what I meant :) >>>>> >>>>> If the SoC XCLKOUT provides the master clock to the max98089 >>>>> codec in Spring like is the case for the max9809{0,5} codecs >>>>> in the Snow and Peach Pit/Pi Chromebooks then you need to do >>>>> something along the lines of the following commits: >>>>> >>>>> e3048c3d2be5 ASoC: max98095: Add master clock handling >>>>> b10ab7b838bd ASoC: max98090: Add master clock handling >>>>> >>>>> If that's the case you also have to mention in the DT binding >>>>> doc that "clocks" and "clock-names" are optional properties >>>>> like Documentation/devicetree/bindings/sound/max9809{0,5}.txt. >>>> >>>> When I prepared this patch, I believe it was a straight copy from >>>> max98090. Sounds like they changed since then. >>>> >>>> My 6/6 adopted the mclk clock from your now-cancelled v2 patch for Snow, >>>> assuming it would be the same on all Chromebooks. I tested that last >>>> change by checking for errors in dmesg. >>>> >>>> Doug, can you advise on how the clock wiring is for Spring? >>> >>> I can confirm that XCLKOUT is connected to the codec MCLK on the >>> Spring schematics I have. >> >> Thanks! I updated max98088 and had it working on first boot, but on >> second boot it complained about the frequency: >> >> [ 7.896834] max98088 7-0010: revision A >> [ 7.912776] snow-audio sound: HiFi <-> 3830000.i2s mapping ok >> [ 7.919367] max98088 7-0010: Invalid master clock frequency >> [ 7.919429] snow-audio sound: ASoC: Spring-I2S-MAX98089 late_probe() >> failed: -22 >> [ 7.920019] snow-audio sound: snd_soc_register_card failed (-22) >> [ 7.920109] snow-audio: probe of sound failed with error -22 > I had the same error on Snow but even on the first boot and after doing some code archeology, I found the following commit [0] in a Samsung downstream tree that solves the issue. The problem is that clk_round_rate(max98095->mclk, freq) returns 0 as the rounded rate if XCLOUT is not allowed to be re-parented on rate change. With Tushar's patch I see that clk_round_rate() returns 24000000 (24MHz) so the codec driver setups the correct PLL clock. You mentioned that it does make the error go away but still audio is not working on Spring. Let's see if someone has an idea of what could be missing. > Reproducible on third boot. > > On a suspicion, the fourth boot I waited for the double-beep of the > firmware (waiting for Ctrl+d/u), and then it did work. > > So it seems the mclk is not always set up properly by the kernel, > relying on firmware. Who's in charge of setting that clock up? > Right, it seems audio is only working due the firmware doing some previous setup. Probably it works on every boot if you have "sound init" as a part of the u-boot boot commands? > Regards, > Andreas > Best regards, Javier [0]: https://github.com/exynos-reference/kernel/commit/34ae055b32e621409a92dea6a29f65b723798f33 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/