From patchwork Tue Jul 25 07:37:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Quentin Schulz X-Patchwork-Id: 9861321 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 AD0BF601A1 for ; Tue, 25 Jul 2017 07:42:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E535283ED for ; Tue, 25 Jul 2017 07:42:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 928BA285FB; Tue, 25 Jul 2017 07:42:31 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 26197283ED for ; Tue, 25 Jul 2017 07:42:30 +0000 (UTC) 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=jylxJxyyG4ECafCcrhuIeEErJV10NjVL/iSfsNUoweQ=; b=CW2128XysW+N219A769p4kLYgw WcyxTXp4SYKTeg391EkCMz63nllv3Ks3OjiEV9wYUN0WPi85PRvtSbXZZiJtGkn3Hd0hoJHR+Yoxu NrCI+Nym6DbVKapjVGu8p5MQAUpScmCnL7NVvD1fdnJmpbeqMsue8lYCHNS5IyVVJWo2ahSxbyPLM mOH0GZl167fpGUd5tBXkQDif/rgjxhFz00mmIlrsjvlJRMYSeKnMY9Fv9487JaeHhLN5rPvhkq3ov rLXX0i8KopkbVRLRRKN+XluQdw/+muVc6rrUdR4l0I+Bt6fDEX9YrFP8I0dGh8FoFBW++NpAhkiTE 60eLaIXw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dZuU6-00016p-M4; Tue, 25 Jul 2017 07:42:26 +0000 Received: from mail.free-electrons.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dZuTG-0000MM-HL for linux-arm-kernel@lists.infradead.org; Tue, 25 Jul 2017 07:41:42 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id 5D95B20919; Tue, 25 Jul 2017 09:41:12 +0200 (CEST) Received: from localhost.localdomain (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id C5A7320F56; Tue, 25 Jul 2017 09:40:53 +0200 (CEST) From: Quentin Schulz To: mturquette@baylibre.com, sboyd@codeaurora.org, robh+dt@kernel.org, mark.rutland@arm.com, lgirdwood@gmail.com, broonie@kernel.org, nicolas.ferre@microchip.com, alexandre.belloni@free-electrons.com, linux@armlinux.org.uk, boris.brezillon@free-electrons.com, perex@perex.cz, tiwai@suse.com Subject: [PATCH v4 5/9] clk: at91: clk-generated: create function to find best_diff Date: Tue, 25 Jul 2017 09:37:06 +0200 Message-Id: <8fe980cd3343111a57bd1b099beaaf51b95396d4.1500968090.git-series.quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170725_004135_736963_3D13AD3F X-CRM114-Status: GOOD ( 13.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thomas.petazzoni@free-electrons.com, devicetree@vger.kernel.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, Quentin Schulz , cyrille.pitchen@wedev4u.fr, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The way to find the best_diff and do the appropriate process afterwards can be re-used. This patch prepares the driver for an upcoming patch that will allow clk_generated to determine the rate of the audio_pll. Signed-off-by: Quentin Schulz Acked-by: Boris Brezillon Acked-by: Nicolas Ferre --- drivers/clk/at91/clk-generated.c | 41 +++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 14 deletions(-) diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c index ef4b4e0..7260e49 100644 --- a/drivers/clk/at91/clk-generated.c +++ b/drivers/clk/at91/clk-generated.c @@ -99,15 +99,36 @@ clk_generated_recalc_rate(struct clk_hw *hw, return DIV_ROUND_CLOSEST(parent_rate, gck->gckdiv + 1); } +static void clk_generated_best_diff(struct clk_rate_request *req, + struct clk_hw *parent, + unsigned long parent_rate, u32 div, + int *best_diff, long *best_rate) +{ + unsigned long tmp_rate; + int tmp_diff; + + if (!div) + tmp_rate = parent_rate; + else + tmp_rate = parent_rate / div; + tmp_diff = abs(req->rate - tmp_rate); + + if (*best_diff < 0 || *best_diff > tmp_diff) { + *best_rate = tmp_rate; + *best_diff = tmp_diff; + req->best_parent_rate = parent_rate; + req->best_parent_hw = parent; + } +} + static int clk_generated_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { struct clk_generated *gck = to_clk_generated(hw); struct clk_hw *parent = NULL; long best_rate = -EINVAL; - unsigned long tmp_rate, min_rate; + unsigned long min_rate; int best_diff = -1; - int tmp_diff; int i; for (i = 0; i < clk_hw_get_num_parents(hw); i++) { @@ -125,18 +146,10 @@ static int clk_generated_determine_rate(struct clk_hw *hw, continue; div = DIV_ROUND_CLOSEST(parent_rate, req->rate); - if (!div) - tmp_rate = parent_rate; - else - tmp_rate = parent_rate / div; - tmp_diff = abs(req->rate - tmp_rate); - - if (best_diff < 0 || best_diff > tmp_diff) { - best_rate = tmp_rate; - best_diff = tmp_diff; - req->best_parent_rate = parent_rate; - req->best_parent_hw = parent; - } + + clk_generated_best_diff(req, parent, parent_rate, div, + &best_diff, &best_rate); + if (!best_diff) break;