From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 958DEC04AAC for ; Mon, 20 May 2019 11:27:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6B6212081C for ; Mon, 20 May 2019 11:27:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="updfp/g8"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=baylibre-com.20150623.gappssmtp.com header.i=@baylibre-com.20150623.gappssmtp.com header.b="xaIpOWBo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B6212081C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=X0ryFgEWGnAQ3z2kUpctIBvR9AqhONlYLvuqZGU03dE=; b=updfp/g8xBlZyR cXLChOL75Pm1kalAuxVkeMskdUyvPTDoZvffju7MGltsqk2ZqEGSJDbKA+X7qoCI4081PxbAFW9vt D0jPRVfWbrw3PmcMVY1SgMotxsoZp3dk4Gl2m2r0AbvzIAAlbfmU+bhf2dlP8dw3unz1/kWcWBk5e vWu1yi53FBHxvft839u+yldsbXxHdZfznukxeK+iYamKvbhfFnVHAl6VNgeA74fSMgQGGYaLoNsda N0k/nsR0eawpvAOPRDT8RrXSERziy8pPjYv95Fpz8OhGen0wlW/oyc2FbTF7P3liMAWj61xpfgbSB eC8kirbUV4ZwZ/rf2Udg==; 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 1hSgRU-0007G7-1m; Mon, 20 May 2019 11:26:56 +0000 Received: from mail-wr1-x441.google.com ([2a00:1450:4864:20::441]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hSgRQ-0007FD-56 for linux-amlogic@lists.infradead.org; Mon, 20 May 2019 11:26:53 +0000 Received: by mail-wr1-x441.google.com with SMTP id w8so14177389wrl.6 for ; Mon, 20 May 2019 04:26:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=message-id:subject:from:to:cc:date:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=HtfyxUMJLQAcq0KfWDawQoWqIdIlp3vHf/VikFApqLs=; b=xaIpOWBoT4uKzuJxww+snLRcZXPpym7ybsnPLh8k0BHxj71Mc2lVJUqyOmhK6qVS2Y ndzvMHayaScDIlQ5fdNuZ584x6OcvfVcu81AX4PMOswoJyRRL8W2Jr6CYt62YZQqn4Bg kOgEfppb3tw2j1n7jjFRqRoZyUHxPFbpQkSFbPdD73vduod3SlLfE8x7bzaFmhBvuVLe Pz34zll8AqvGPghWpF+vslF4MwrLhgteqOAwtzaKFljOvo9yGK0zXr04onSF1TcCKtl/ c3m0zVGWXfsma2qdqGgpM170t9e7inYjpYbPIRCi52XBA7FukoxGGz29oEBOAyoPUrXI mlDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=HtfyxUMJLQAcq0KfWDawQoWqIdIlp3vHf/VikFApqLs=; b=fyoUKMNYCxW6XBFMBdi9nM8kn0ElSlL7Dg+JX49nQVbneJiar+sxGIBGbNDfl7vu3j XjsqDg52Tu9dV9S9pG82sP6eu4Ou+s0CQRayRzj5+4qeQvWGhLjx3OZe8DmDevuXqa+F x4alP4EJOdHjmxGJh/u3+j4mQ7X5WriQbFN0f+DL81nj4/XJ1UWeRgm2W03FphGjzkN3 JrhCkDsDusIGf2i7uRDAzdz9iCZmbYjiXUXZn9v3j/LfqZJwtUqmEg4rMngtPqUrANnZ wZvUtyYggUChyOAmakaIbKzON//qc/VJj2x5oTW3mT4KSc7hqC9qLY9olYZdA/mdasSq ID+w== X-Gm-Message-State: APjAAAXfCE61zliZDwNPPIC1H7jbLyhbphA5xU4R1i+vnjhIHHqZrBhE J4Z+pL+Y7AguYfPSJcoP7LyzMQ== X-Google-Smtp-Source: APXvYqw4UiCpX3rKI6633yiMqqQyEYhGUUtxX+2oz4H6tQ9iVRuwKYecsWkeZ8CFqwdWHbMKMBd44g== X-Received: by 2002:a5d:6610:: with SMTP id n16mr36510123wru.250.1558351610484; Mon, 20 May 2019 04:26:50 -0700 (PDT) Received: from boomer.baylibre.com (lmontsouris-657-1-212-31.w90-63.abo.wanadoo.fr. [90.63.244.31]) by smtp.gmail.com with ESMTPSA id s18sm15016292wmc.41.2019.05.20.04.26.49 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 20 May 2019 04:26:49 -0700 (PDT) Message-ID: Subject: Re: [PATCH v2 0/7] clk: meson: fix mpll jitter From: Jerome Brunet To: Neil Armstrong , Michael Turquette , Stephen Boyd Date: Mon, 20 May 2019 13:26:48 +0200 In-Reply-To: <20190513123115.18145-1-jbrunet@baylibre.com> References: <20190513123115.18145-1-jbrunet@baylibre.com> User-Agent: Evolution 3.30.5 (3.30.5-1.fc29) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190520_042652_207446_2DF15753 X-CRM114-Status: GOOD ( 18.99 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Hilman , linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On Mon, 2019-05-13 at 14:31 +0200, Jerome Brunet wrote: > This patchset is a squash of these previous patchsets [0], [1] without > modification, beside a re-ordering of the changes to facilitate backports > > We are observing a lot of jitter on the MPLL outputs of the g12a. > No such jitter is seen on gx family. On the axg family, only MPLL2 > seems affected. This was not a problem so far since this MPLL output > is not used. > > The jitter can be as high as +/- 4%. > > This is a problem for audio application. This may cause distortion on > i2s and completely break SPDIF. > > After exchanging with Amlogic, it seems we have activated (by mistake) > the 'spread spectrum' feature. > > The 3 first patches properly set the bit responsible for the spread > spectrum in the mpll driver and add the required correction in the > related clock controllers. > > When the g12a support has been initially submitted, the MPLL appeared > (overall) fine. At the time, the board I used was flashed with Amlogic > vendor u-boot. Since then, I moved to an early version on mainline > u-boot, which is likely to initialize the clock differently. > > While debugging audio support, I noticed that MPLL based clocks were way > above target. It appeared the fractional part of the divider was not > working. > > To work properly, the MPLLs each needs an initial setting in addition to > a common one. No one likes those register sequences but sometimes, like > here for PLL clocks, there is no way around it. > > The last 4 patches add the possibility to set initial register sequence > for the ee clock controller and the MPLL driver. It is then used to enable > the fractional part of the g12a MPLL. > > As agreed with the clock maintainers, I'll submit a series to CCF to > remove the .init() callbacks and introduce register()/deregister() > callbacks later on (pinky swear). > > Jerome Brunet (7): > clk: meson: mpll: properly handle spread spectrum > clk: meson: gxbb: no spread spectrum on mpll0 > clk: meson: axg: spread spectrum is on mpll2 > clk: meson: mpll: add init callback and regs > clk: meson: g12a: add mpll register init sequences > clk: meson: eeclk: add init regs > clk: meson: g12a: add controller register init > > drivers/clk/meson/axg.c | 10 ++++----- > drivers/clk/meson/clk-mpll.c | 36 ++++++++++++++++++++++++--------- > drivers/clk/meson/clk-mpll.h | 3 +++ > drivers/clk/meson/g12a.c | 32 ++++++++++++++++++++++++++++- > drivers/clk/meson/gxbb.c | 5 ----- > drivers/clk/meson/meson-eeclk.c | 3 +++ > drivers/clk/meson/meson-eeclk.h | 2 ++ > 7 files changed, 70 insertions(+), 21 deletions(-) > series applied to v5.3/drivers _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic