From patchwork Mon Jan 15 23:16:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 10165449 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EDB34602C2 for ; Mon, 15 Jan 2018 23:18:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DEC8127B2F for ; Mon, 15 Jan 2018 23:18:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D393227BFF; Mon, 15 Jan 2018 23:18:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, T_DKIM_INVALID autolearn=no version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B86BF27B2F for ; Mon, 15 Jan 2018 23:18:46 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 58105267659; Tue, 16 Jan 2018 00:17:40 +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 657F5267627; Tue, 16 Jan 2018 00:17:31 +0100 (CET) Received: from mail-pg0-f66.google.com (mail-pg0-f66.google.com [74.125.83.66]) by alsa0.perex.cz (Postfix) with ESMTP id 0ECC326761D for ; Tue, 16 Jan 2018 00:17:27 +0100 (CET) Received: by mail-pg0-f66.google.com with SMTP id z17so8596857pgc.4 for ; Mon, 15 Jan 2018 15:17:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=KowOSD04aByRSWUUvqlOqIr1dv5sQaHK2kjK08LVG5M=; b=IlFsRVKKPcwMRGGFKfkHBuc2Uk+tWMw/QlP7WIVTKW59nTCiSdAbIiJMS9BmeMLvSH YGFmAkrSuiGtxggVeX4vqXpBTTvP7VgLbdTGGN1TN6BW4x/+y911iwWnV+YKqLS2H/Bo mOZJGjhqLwlVnyo2byGnirD82BE/Jg7HsFdLXvbOS5ugVw/OzOWh5SarmYYHucGGDt/+ AQbz/bIriJMuO9ZVEiCaAXalUyy6ath5gWe0OpfuwdrYoqdtbQfLdF4vCqyXWB/KyT3p WuB2AfW4Wt/AJ5+7zKCunUC1AEZidUg8538Tf+lNqVr0G7TRFEmiP9fu9UNHUqFx4BLm 1RoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=KowOSD04aByRSWUUvqlOqIr1dv5sQaHK2kjK08LVG5M=; b=MC8E4TNec+o7ZYeerBwGzWa/BYneY12tAIboYk/hV3Xd2oagAY9FZSDS9RfR5OBxoP p7ACxF/a8jkTWLej3pYGOD6Nvl6mU909So7bAciaoMApMcu9BHk80qx33/sYNa2xg/pI m6gsAhQ8JdYIJtmemJYD/M9jNDWJVN2V+32kWQk2BgXL/vI7FsWK891BSQKOk04RZehH zQr1YDDdtSWs4u7bKhdmAs+37w2YUuSckRPAZNlzOnlzNuHGUESGxGaC2V99Os2XBqS3 IEHD/1FbQRr7u40KjJNj5AY676sd6oUYSeoTlbry2hXr8LHEvv0O8i9yjbMVgGC2ZhJF GWQA== X-Gm-Message-State: AKwxytfU9cGmsbG/kMztIGGojDxi577t8W4h4/FDC6CLdkM+/IDWQCIN kV1+/aMxsI58ytuBBVHDWHc= X-Google-Smtp-Source: ACJfBotsq5UsFaFjgQ+W//jE+bd5DDDDzBlzXTp0ir6WLipegrE7fp965XYKLMb6TfCnXSlzY/Tpxg== X-Received: by 10.99.188.17 with SMTP id q17mr14565488pge.43.1516058246896; Mon, 15 Jan 2018 15:17:26 -0800 (PST) Received: from Asurada-CZ80.localdomain (c-73-231-2-134.hsd1.ca.comcast.net. [73.231.2.134]) by smtp.gmail.com with ESMTPSA id b6sm776442pfe.85.2018.01.15.15.17.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 15 Jan 2018 15:17:26 -0800 (PST) From: Nicolin Chen To: timur@tabi.org, broonie@kernel.org, mail@maciej.szmigiero.name Date: Mon, 15 Jan 2018 15:16:20 -0800 Message-Id: <1516058192-65519-6-git-send-email-nicoleotsuka@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1516058192-65519-1-git-send-email-nicoleotsuka@gmail.com> References: <1516058192-65519-1-git-send-email-nicoleotsuka@gmail.com> Cc: alsa-devel@alsa-project.org, kernel@pengutronix.de, linux-kernel@vger.kernel.org, caleb@crome.org, lgirdwood@gmail.com, arnaud.mouiche@invoxia.com, lukma@denx.de, fabio.estevam@nxp.com, linuxppc-dev@lists.ozlabs.org Subject: [alsa-devel] [PATCH v4 05/17] ASoC: fsl_ssi: Rename fsl_ssi_disable_val macro 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: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP The define of fsl_ssi_disable_val is not so clear as it mixes two steps of calculations together. And those parameter names are also a bit long to read. Since it just tries to exclude the shared bits from the regvals of current stream while the opposite stream is active, it's better to use something like ssi_excl_shared_bits. This patch also bisects fsl_ssi_disable_val into two macros of two corresponding steps and then shortens its parameter names. It also updates callers in the fsl_ssi_config() accordingly. Signed-off-by: Nicolin Chen Tested-by: Caleb Crome --- Changelog v3 * Replaced !dir with int adir sound/soc/fsl/fsl_ssi.c | 55 +++++++++++++++++++++---------------------------- 1 file changed, 23 insertions(+), 32 deletions(-) diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index 51e7405..bbeef71 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -421,24 +421,24 @@ static void fsl_ssi_fifo_clear(struct fsl_ssi *ssi, bool is_rx) } /** - * Calculate the bits that have to be disabled for the current stream that is - * getting disabled. This keeps the bits enabled that are necessary for the - * second stream to work if 'stream_active' is true. + * Exclude bits that are used by the opposite stream * - * Detailed calculation: - * These are the values that need to be active after disabling. For non-active - * second stream, this is 0: - * vals_stream * !!stream_active + * When both streams are active, disabling some bits for the current stream + * might break the other stream if these bits are used by it. * - * The following computes the overall differences between the setup for the - * to-disable stream and the active stream, a simple XOR: - * vals_disable ^ (vals_stream * !!(stream_active)) + * @vals : regvals of the current stream + * @avals: regvals of the opposite stream + * @aactive: active state of the opposite stream * - * The full expression adds a mask on all values we care about + * 1) XOR vals and avals to get the differences if the other stream is active; + * Otherwise, return current vals if the other stream is not active + * 2) AND the result of 1) with the current vals */ -#define fsl_ssi_disable_val(vals_disable, vals_stream, stream_active) \ - ((vals_disable) & \ - ((vals_disable) ^ ((vals_stream) * (u32)!!(stream_active)))) +#define _ssi_xor_shared_bits(vals, avals, aactive) \ + ((vals) ^ ((avals) * (aactive))) + +#define ssi_excl_shared_bits(vals, avals, aactive) \ + ((vals) & _ssi_xor_shared_bits(vals, avals, aactive)) /** * Enable or disable SSI configuration. @@ -446,19 +446,14 @@ static void fsl_ssi_fifo_clear(struct fsl_ssi *ssi, bool is_rx) static void fsl_ssi_config(struct fsl_ssi *ssi, bool enable, struct fsl_ssi_regvals *vals) { + int adir = (&ssi->regvals[TX] == vals) ? RX : TX; int dir = (&ssi->regvals[TX] == vals) ? TX : RX; struct regmap *regs = ssi->regs; struct fsl_ssi_regvals *avals; - int nr_active_streams; - int keep_active; - - nr_active_streams = !!(ssi->streams & BIT(TX)) + - !!(ssi->streams & BIT(RX)); + bool aactive; - if (nr_active_streams - 1 > 0) - keep_active = 1; - else - keep_active = 0; + /* Check if the opposite stream is active */ + aactive = ssi->streams & BIT(adir); /* Get the opposite direction to keep its values untouched */ if (&ssi->regvals[RX] == vals) @@ -471,8 +466,7 @@ static void fsl_ssi_config(struct fsl_ssi *ssi, bool enable, * To keep the other stream safe, exclude shared bits between * both streams, and get safe bits to disable current stream */ - u32 scr = fsl_ssi_disable_val(vals->scr, avals->scr, - keep_active); + u32 scr = ssi_excl_shared_bits(vals->scr, avals->scr, aactive); /* Safely disable SCR register for the stream */ regmap_update_bits(regs, REG_SSI_SCR, scr, 0); @@ -487,7 +481,7 @@ static void fsl_ssi_config(struct fsl_ssi *ssi, bool enable, * 2) Disable all remaining bits of both streams when last stream ends */ if (ssi->soc->offline_config) { - if ((enable && !nr_active_streams) || (!enable && !keep_active)) + if ((enable && !ssi->streams) || (!enable && !aactive)) fsl_ssi_rxtx_config(ssi, enable); goto config_done; @@ -509,12 +503,9 @@ static void fsl_ssi_config(struct fsl_ssi *ssi, bool enable, * To keep the other stream safe, exclude shared bits between * both streams, and get safe bits to disable current stream */ - sier = fsl_ssi_disable_val(vals->sier, avals->sier, - keep_active); - srcr = fsl_ssi_disable_val(vals->srcr, avals->srcr, - keep_active); - stcr = fsl_ssi_disable_val(vals->stcr, avals->stcr, - keep_active); + sier = ssi_excl_shared_bits(vals->sier, avals->sier, aactive); + srcr = ssi_excl_shared_bits(vals->srcr, avals->srcr, aactive); + stcr = ssi_excl_shared_bits(vals->stcr, avals->stcr, aactive); /* Safely disable other control registers for the stream */ regmap_update_bits(regs, REG_SSI_SRCR, srcr, 0);