From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0962EC33CAF for ; Wed, 22 Jan 2020 09:15:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D546F24655 for ; Wed, 22 Jan 2020 09:15:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="uBtieWXw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729158AbgAVJPp (ORCPT ); Wed, 22 Jan 2020 04:15:45 -0500 Received: from lelv0142.ext.ti.com ([198.47.23.249]:42224 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725911AbgAVJPo (ORCPT ); Wed, 22 Jan 2020 04:15:44 -0500 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 00M9FMLM122955; Wed, 22 Jan 2020 03:15:22 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1579684522; bh=p6TXy9D8Jj5ZMAsUl92rse85KpLnXYI0D7il7xeObjo=; h=Subject:To:CC:References:From:Date:In-Reply-To; b=uBtieWXwbpXSnRK/R3juokz75ZF07c3mFcuNzH5xfgGKpgBJPYDmetcojC/2gI9gN 0VOEXTfL2++aG1uTJbYPyywW3QlkZZVZYsgZZaJUD4mknt6vWvHEYL0OY/TgmX2SW2 Ngi7YqDlsI0/rO0y0n5xfRIm29JqCAdjoS1cC6wk= Received: from DLEE104.ent.ti.com (dlee104.ent.ti.com [157.170.170.34]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id 00M9FM9x030906; Wed, 22 Jan 2020 03:15:22 -0600 Received: from DLEE109.ent.ti.com (157.170.170.41) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Wed, 22 Jan 2020 03:15:22 -0600 Received: from fllv0040.itg.ti.com (10.64.41.20) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Wed, 22 Jan 2020 03:15:22 -0600 Received: from [192.168.2.6] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 00M9FJa9046831; Wed, 22 Jan 2020 03:15:19 -0600 Subject: Re: [PATCH 2/2] drm/bridge: Add tc358768 driver To: Andrzej Hajda , , , , , CC: , , , , , , References: <20191217101506.18910-1-peter.ujfalusi@ti.com> <20191217101506.18910-3-peter.ujfalusi@ti.com> <35d664fe-8091-2744-abf2-69828ebf1148@samsung.com> <14306079-500d-09ca-df94-4cf72c43f858@ti.com> From: Peter Ujfalusi Message-ID: Date: Wed, 22 Jan 2020 11:16:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 8bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrzej, On 22/01/2020 10.46, Andrzej Hajda wrote: >>>> +struct tc358768_priv { >>>> + struct device *dev; >>>> + struct regmap *regmap; >>>> + struct gpio_desc *reset_gpio; >>>> + struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)]; >>>> + struct clk *refclk; >>>> + >>>> + struct mipi_dsi_host dsi_host; >>>> + struct drm_bridge bridge; >>>> + struct tc358768_dsi_output output; >>> >>> Since tc358768_dsi_output is used only here, you can define it here as >>> well, up to you. >> I think I have done it like this to avoid thinking about prefixes for >> what is under the tc358768_dsi_output. >> I'll take a look if it will look better unpacked here. > > I though rather about in-place anonymous struct definition: > > +    struct tc358768_dsi_output { > +        struct mipi_dsi_device *dev; > +        struct drm_panel *panel; > +        struct drm_bridge *bridge; > +    } output; > > But, as I said - up to you. I see. I think I will keep how it was. They are in proximity, so easy to check. >>>> + >>>> + refclk = clk_get_rate(priv->refclk); >>>> + >>>> + best_diff = UINT_MAX; >>>> + best_pll = 0; >>>> + best_prd = 0; >>>> + best_fbd = 0; >>>> + >>>> + for (prd = 0; prd < 16; ++prd) { >>>> + u32 divisor = (prd + 1) * (1 << frs); >>>> + u32 fbd; >>>> + >>>> + for (fbd = 0; fbd < 512; ++fbd) { >>>> + u32 pll, diff; >>>> + >>>> + pll = (u32)div_u64((u64)refclk * (fbd + 1), divisor); >>>> + >>>> + if (pll >= max_pll || pll < min_pll) >>>> + continue; >>>> + >>>> + diff = max(pll, target_pll) - min(pll, target_pll); >>>> + >>>> + if (diff < best_diff) { >>>> + best_diff = diff; >>>> + best_pll = pll; >>>> + best_prd = prd; >>>> + best_fbd = fbd; >>>> + } >>>> + >>>> + if (best_diff == 0) >>>> + break; >>>> + } >>>> + >>>> + if (best_diff == 0) >>>> + break; >>> why another check here? >> To break out from the top for() loop also in case exact match has been >> found. > > > Ahh, OK. So maybe you should put "if (diff == 0) goto found" inside "if > (diff < best_diff)" block, in such case goto is not considered harmful > :), and is more readable. Exactly my thoughts ;) - Péter Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. 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dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0D6C56F409; Wed, 22 Jan 2020 09:15:36 +0000 (UTC) Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by gabe.freedesktop.org (Postfix) with ESMTPS id CDFC66F409 for ; Wed, 22 Jan 2020 09:15:34 +0000 (UTC) Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 00M9FMLM122955; Wed, 22 Jan 2020 03:15:22 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1579684522; bh=p6TXy9D8Jj5ZMAsUl92rse85KpLnXYI0D7il7xeObjo=; h=Subject:To:CC:References:From:Date:In-Reply-To; b=uBtieWXwbpXSnRK/R3juokz75ZF07c3mFcuNzH5xfgGKpgBJPYDmetcojC/2gI9gN 0VOEXTfL2++aG1uTJbYPyywW3QlkZZVZYsgZZaJUD4mknt6vWvHEYL0OY/TgmX2SW2 Ngi7YqDlsI0/rO0y0n5xfRIm29JqCAdjoS1cC6wk= Received: from DLEE104.ent.ti.com (dlee104.ent.ti.com [157.170.170.34]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id 00M9FM9x030906; Wed, 22 Jan 2020 03:15:22 -0600 Received: from DLEE109.ent.ti.com (157.170.170.41) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Wed, 22 Jan 2020 03:15:22 -0600 Received: from fllv0040.itg.ti.com (10.64.41.20) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Wed, 22 Jan 2020 03:15:22 -0600 Received: from [192.168.2.6] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 00M9FJa9046831; Wed, 22 Jan 2020 03:15:19 -0600 Subject: Re: [PATCH 2/2] drm/bridge: Add tc358768 driver To: Andrzej Hajda , , , , , References: <20191217101506.18910-1-peter.ujfalusi@ti.com> <20191217101506.18910-3-peter.ujfalusi@ti.com> <35d664fe-8091-2744-abf2-69828ebf1148@samsung.com> <14306079-500d-09ca-df94-4cf72c43f858@ti.com> From: Peter Ujfalusi Message-ID: Date: Wed, 22 Jan 2020 11:16:00 +0200 User-Agent: Mozilla/5.0 (X11; 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