From patchwork Fri Dec 13 06:43:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 3338621 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 332A19F44E for ; Fri, 13 Dec 2013 06:45:49 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 40C15200CA for ; Fri, 13 Dec 2013 06:45:48 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 305C12062C for ; Fri, 13 Dec 2013 06:45:47 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VrMTl-0006QS-MA; Fri, 13 Dec 2013 06:44:06 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VrMTF-0006CG-Ek; Fri, 13 Dec 2013 06:43:33 +0000 Received: from co9ehsobe004.messaging.microsoft.com ([207.46.163.27] helo=co9outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VrMSi-00067l-Oj for linux-arm-kernel@lists.infradead.org; Fri, 13 Dec 2013 06:43:02 +0000 Received: from mail182-co9-R.bigfish.com (10.236.132.235) by CO9EHSOBE017.bigfish.com (10.236.130.80) with Microsoft SMTP Server id 14.1.225.22; Fri, 13 Dec 2013 06:42:32 +0000 Received: from mail182-co9 (localhost [127.0.0.1]) by mail182-co9-R.bigfish.com (Postfix) with ESMTP id C2E973802C9; Fri, 13 Dec 2013 06:42:32 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 0 X-BigFish: VS0(zzzz1f42h2148h208ch1ee6h1de0h1fdah2073h2146h1202h1e76h2189h1d1ah1d2ah1fc6hzz1de098h8275dh1de097hz2dh87h2a8h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh2222h224fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h2218h2216h226dh22d0h2327h2336h1151h1155h) X-FB-DOMAIN-IP-MATCH: fail Received: from mail182-co9 (localhost.localdomain [127.0.0.1]) by mail182-co9 (MessageSwitch) id 1386916949769808_32166; Fri, 13 Dec 2013 06:42:29 +0000 (UTC) Received: from CO9EHSMHS005.bigfish.com (unknown [10.236.132.229]) by mail182-co9.bigfish.com (Postfix) with ESMTP id B76626004A; Fri, 13 Dec 2013 06:42:29 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by CO9EHSMHS005.bigfish.com (10.236.130.15) with Microsoft SMTP Server (TLS) id 14.16.227.3; Fri, 13 Dec 2013 06:42:29 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-005.039d.mgd.msft.net (10.84.1.17) with Microsoft SMTP Server (TLS) id 14.3.158.2; Fri, 13 Dec 2013 06:42:28 +0000 Received: from S2101-09.ap.freescale.net ([10.192.185.200]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id rBD6gMab031539; Thu, 12 Dec 2013 23:42:26 -0700 From: Shawn Guo To: Subject: [PATCH 2/2] ASoC: sgtl5000: clean up sgtl5000_enable_regulators() Date: Fri, 13 Dec 2013 14:43:03 +0800 Message-ID: <1386916983-27832-2-git-send-email-shawn.guo@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1386916983-27832-1-git-send-email-shawn.guo@linaro.org> References: <1386916983-27832-1-git-send-email-shawn.guo@linaro.org> MIME-Version: 1.0 X-OriginatorOrg: sigmatel.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% X-FOPE-CONNECTOR: Id%0$Dn%FREESCALE.MAIL.ONMICROSOFT.COM$RO%1$TLS%0$FQDN%$TlsDn% X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131213_014300_997580_41498FE7 X-CRM114-Status: GOOD ( 18.76 ) X-Spam-Score: -2.3 (--) Cc: Mark Brown , Xiubo Li , linux-arm-kernel@lists.infradead.org, Shawn Guo X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY, UNRESOLVED_TEMPLATE autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Function sgtl5000_enable_regulators() is somehow odd in handling the optional external VDDD supply. The driver can only enable this supply on SGTL5000 chip before revision 0x11, and of course when this external VDDD is present. It currently does something like below. 1. Check if regulator_bulk_get() on VDDA, VDDIO and VDDD will fail. If it fails, VDDD must be absent and it falls on internal LDO by calling sgtl5000_replace_vddd_with_ldo(). Otherwise, VDDD is used. And in either case, regulator_bulk_enable() will be called to enable 3 supplies. 2. In case that SGTL5000 revision is later than 0x11, even if external VDDD is present, it has to roll back the 'enable' and 'get' calls with regulator_bulk_disable() and regulator_bulk_free(), and starts over again by calling sgtl5000_replace_vddd_with_ldo() and regulator_bulk_enable(). Such back and forth calls sequence is complicated and unnecessary. Also, since commit 4ddfebd (regulator: core: Provide a dummy regulator with full constraints), regulator_bulk_get() will always succeeds because of the dummy regulator. Thus the VDDD detection is broken. The patch changes the flow to something like the following, which should be more reasonable and clear, and also fix the VDDD detection breakage. 1. Check if we're running a chip before revision 0x11, on which an external VDDD can possibly be an option. 2. If it is an early revision, call regulator_get_optional() to detect whether an external VDDD supply is available. 3. If external VDDD is present, call sgtl5000_replace_vddd_with_ldo() to update sgtl5000->supplies info. 4. Drop regulator_bulk_get() call in sgtl5000_replace_vddd_with_ldo(), and call it in sgtl5000_enable_regulators() no matter it's an external VDDD or internal LDO. 5. Call regulator_bulk_enable() to enable these 3 regulators. Signed-off-by: Shawn Guo --- sound/soc/codecs/sgtl5000.c | 62 +++++++++++++++---------------------------- 1 file changed, 22 insertions(+), 40 deletions(-) diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index bd291d2..0fcbe90 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -1286,15 +1286,6 @@ static int sgtl5000_replace_vddd_with_ldo(struct snd_soc_codec *codec) sgtl5000->supplies[VDDD].supply = LDO_CONSUMER_NAME; - ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(sgtl5000->supplies), - sgtl5000->supplies); - - if (ret) { - ldo_regulator_remove(codec); - dev_err(codec->dev, "Failed to request supplies: %d\n", ret); - return ret; - } - dev_info(codec->dev, "Using internal LDO instead of VDDD\n"); return 0; } @@ -1305,20 +1296,35 @@ static int sgtl5000_enable_regulators(struct snd_soc_codec *codec) int i; int external_vddd = 0; struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); + struct regulator *vddd; for (i = 0; i < ARRAY_SIZE(sgtl5000->supplies); i++) sgtl5000->supplies[i].supply = supply_names[i]; - ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(sgtl5000->supplies), - sgtl5000->supplies); - if (!ret) - external_vddd = 1; - else { + /* External VDDD only works before revision 0x11 */ + if (sgtl5000->revision < 0x11) { + vddd = regulator_get_optional(codec->dev, "VDDD"); + if (IS_ERR(vddd)) { + /* See if it's just not registered yet */ + if (PTR_ERR(vddd) == -EPROBE_DEFER) + return -EPROBE_DEFER; + } else { + external_vddd = 1; + regulator_put(vddd); + } + } + + if (!external_vddd) { ret = sgtl5000_replace_vddd_with_ldo(codec); if (ret) return ret; } + ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(sgtl5000->supplies), + sgtl5000->supplies); + if (ret) + goto err_ldo_remove; + ret = regulator_bulk_enable(ARRAY_SIZE(sgtl5000->supplies), sgtl5000->supplies); if (ret) @@ -1327,37 +1333,13 @@ static int sgtl5000_enable_regulators(struct snd_soc_codec *codec) /* wait for all power rails bring up */ udelay(10); - /* - * workaround for revision 0x11 and later, - * roll back to use internal LDO - */ - if (external_vddd && sgtl5000->revision >= 0x11) { - /* disable all regulator first */ - regulator_bulk_disable(ARRAY_SIZE(sgtl5000->supplies), - sgtl5000->supplies); - /* free VDDD regulator */ - regulator_bulk_free(ARRAY_SIZE(sgtl5000->supplies), - sgtl5000->supplies); - - ret = sgtl5000_replace_vddd_with_ldo(codec); - if (ret) - return ret; - - ret = regulator_bulk_enable(ARRAY_SIZE(sgtl5000->supplies), - sgtl5000->supplies); - if (ret) - goto err_regulator_free; - - /* wait for all power rails bring up */ - udelay(10); - } - return 0; err_regulator_free: regulator_bulk_free(ARRAY_SIZE(sgtl5000->supplies), sgtl5000->supplies); - if (external_vddd) +err_ldo_remove: + if (!external_vddd) ldo_regulator_remove(codec); return ret;