From patchwork Mon Jan 7 21:55:14 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Dunn X-Patchwork-Id: 1942731 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id DEC073FE37 for ; Mon, 7 Jan 2013 21:59:00 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TsKft-0006Vj-OE; Mon, 07 Jan 2013 21:56:06 +0000 Received: from smtp.newsguy.com ([74.209.136.69]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TsKfZ-0006RV-Co for linux-arm-kernel@lists.infradead.org; Mon, 07 Jan 2013 21:55:46 +0000 Received: from localhost.localdomain (46.sub-70-199-231.myvzw.com [70.199.231.46]) by smtp.newsguy.com (8.14.3/8.14.3) with ESMTP id r07LtGcm045500 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 7 Jan 2013 13:55:36 -0800 (PST) (envelope-from mikedunn@newsguy.com) From: Mike Dunn To: alsa-devel@alsa-project.org Subject: [PATCH 3/3] ALSA: pxa27x: rename pxa27x_assert_ac97reset() Date: Mon, 7 Jan 2013 13:55:14 -0800 Message-Id: <1357595714-13698-4-git-send-email-mikedunn@newsguy.com> X-Mailer: git-send-email 1.7.8.6 In-Reply-To: <1357595714-13698-1-git-send-email-mikedunn@newsguy.com> References: <1357595714-13698-1-git-send-email-mikedunn@newsguy.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130107_165545_666885_9A4D16B0 X-CRM114-Status: GOOD ( 15.07 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Marek Vasut , Mike Dunn , Mark Brown , Igor Grinberg , Eric Miao , Robert Jarzmik , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch does nothing functionally, it just gives the function a new name and modifies the prototype slightly in order to clarify what the function is doing (which is not necessarily asserting the reset). Some commentary also added. Tested on a palm treo 680 machine. Signed-off-by: Mike Dunn Acked-by: Igor Grinberg --- arch/arm/mach-pxa/pxa27x.c | 20 ++++++++++++++------ sound/arm/pxa2xx-ac97-lib.c | 8 ++++---- 2 files changed, 18 insertions(+), 10 deletions(-) diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c index 616cb87..69985b06 100644 --- a/arch/arm/mach-pxa/pxa27x.c +++ b/arch/arm/mach-pxa/pxa27x.c @@ -53,17 +53,25 @@ static unsigned long ac97_reset_config[] = { GPIO95_AC97_nRESET, }; -void pxa27x_assert_ac97reset(int reset_gpio, int on) +void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio) { + /* + * This helper function is used to work around a bug in the pxa27x's + * ac97 controller during a warm reset. The configuration of the + * reset_gpio is changed as follows: + * to_gpio == true: configured to generic output gpio and driven high + * to_gpio == false: configured to ac97 controller alt fn AC97_nRESET + */ + if (reset_gpio == 113) - pxa2xx_mfp_config(on ? &ac97_reset_config[0] : - &ac97_reset_config[1], 1); + pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[0] : + &ac97_reset_config[1], 1); if (reset_gpio == 95) - pxa2xx_mfp_config(on ? &ac97_reset_config[2] : - &ac97_reset_config[3], 1); + pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[2] : + &ac97_reset_config[3], 1); } -EXPORT_SYMBOL_GPL(pxa27x_assert_ac97reset); +EXPORT_SYMBOL_GPL(pxa27x_configure_ac97reset); /* Crystal clock: 13MHz */ #define BASE_CLK 13000000 diff --git a/sound/arm/pxa2xx-ac97-lib.c b/sound/arm/pxa2xx-ac97-lib.c index fff7753..e6f4633 100644 --- a/sound/arm/pxa2xx-ac97-lib.c +++ b/sound/arm/pxa2xx-ac97-lib.c @@ -34,7 +34,7 @@ static struct clk *ac97_clk; static struct clk *ac97conf_clk; static int reset_gpio; -extern void pxa27x_assert_ac97reset(int reset_gpio, int on); +extern void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio); /* * Beware PXA27x bugs: @@ -140,10 +140,10 @@ static inline void pxa_ac97_warm_pxa27x(void) gsr_bits = 0; /* warm reset broken on Bulverde, so manually keep AC97 reset high */ - pxa27x_assert_ac97reset(reset_gpio, 1); + pxa27x_configure_ac97reset(reset_gpio, true); udelay(10); GCR |= GCR_WARM_RST; - pxa27x_assert_ac97reset(reset_gpio, 0); + pxa27x_configure_ac97reset(reset_gpio, false); udelay(500); } @@ -358,7 +358,7 @@ int pxa2xx_ac97_hw_probe(struct platform_device *dev) __func__, ret); goto err_conf; } - pxa27x_assert_ac97reset(reset_gpio, 0); + pxa27x_configure_ac97reset(reset_gpio, false); ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK"); if (IS_ERR(ac97conf_clk)) {