From patchwork Tue Mar 22 03:57:05 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AS50 KCHSU0 X-Patchwork-Id: 8637811 Return-Path: X-Original-To: patchwork-alsa-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id ACEE59F44D for ; Tue, 22 Mar 2016 03:57:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DCB6B2034E for ; Tue, 22 Mar 2016 03:57:16 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.kernel.org (Postfix) with ESMTP id 91B882035B for ; Tue, 22 Mar 2016 03:57:15 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id B0AF8265743; Tue, 22 Mar 2016 04:57:13 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 14D182652AC; Tue, 22 Mar 2016 04:57:07 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id B09502652AC; Tue, 22 Mar 2016 04:57:04 +0100 (CET) Received: from maillog.nuvoton.com (maillog.nuvoton.com [202.39.227.15]) by alsa0.perex.cz (Postfix) with ESMTP id 8A9F126516A for ; Tue, 22 Mar 2016 04:56:57 +0100 (CET) Received: from nthcims03.nuvoton.com (nthcims03.nuvoton.com [10.1.8.100]) by maillog.nuvoton.com (Postfix) with ESMTP id 6E4171C804C5; Tue, 22 Mar 2016 11:56:54 +0800 (CST) Received: from localhost.localdomain (10.4.36.27) by nthcims03.nuvoton.com (10.1.8.100) with Microsoft SMTP Server id 8.3.327.1; Tue, 22 Mar 2016 11:56:54 +0800 From: John Hsu To: Date: Tue, 22 Mar 2016 11:57:05 +0800 Message-ID: <1458619025-28306-1-git-send-email-KCHSU0@nuvoton.com> X-Mailer: git-send-email 2.6.4 MIME-Version: 1.0 Cc: alsa-devel@alsa-project.org, anatol.pomozov@gmail.com, YHCHuang@nuvoton.com, John Hsu , lgirdwood@gmail.com, benzh@chromium.org, CTLIN0@nuvoton.com, mhkuo@nuvoton.com, yong.zhi@intel.com Subject: [alsa-devel] [PATCH] ASoC: nau8825: reduce standby power consumption X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP Decrease internal clock frequency for power saving when standby. But clock divider needs restore when MCLK as system clock in playback. Signed-off-by: John Hsu --- sound/soc/codecs/nau8825.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c index 3e7bee2..4c8572c 100644 --- a/sound/soc/codecs/nau8825.c +++ b/sound/soc/codecs/nau8825.c @@ -1116,6 +1116,9 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id, regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER, NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_MCLK); regmap_update_bits(regmap, NAU8825_REG_FLL6, NAU8825_DCO_EN, 0); + /* MCLK not changed by clock tree */ + regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER, + NAU8825_CLK_MCLK_SRC_MASK, 0); ret = nau8825_mclk_prepare(nau8825, freq); if (ret) return ret; @@ -1126,6 +1129,13 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id, NAU8825_DCO_EN); regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER, NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_VCO); + /* Decrease the VCO frequency for power saving */ + regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER, + NAU8825_CLK_MCLK_SRC_MASK, 0xf); + regmap_update_bits(regmap, NAU8825_REG_FLL1, + NAU8825_FLL_RATIO_MASK, 0x10); + regmap_update_bits(regmap, NAU8825_REG_FLL6, + NAU8825_SDM_EN, NAU8825_SDM_EN); if (nau8825->mclk_freq) { clk_disable_unprepare(nau8825->mclk); nau8825->mclk_freq = 0;