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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5C1D3D1715D for ; Tue, 22 Oct 2024 03:24:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=AmUReFKhicS3m0ObmDL8efshVJq3oQSu+lPrt4djDi4=; b=PBPyeke2QXb8WxZGa7+ASotIWS J7spHHL3oyk16OjDA5oDJQLhT3H7BDy9+YiVYnAFgEpZ2hY3Q6rPNxf5PyIlzbCH1DAiVQm7xyMhd KoSVEPKRn/Q8lApay4+6UXDMbgpeFQVZox8qhnS2NBpPQ7wnkspbv3Iw99rz1vX/+puavvT32X/8I 7U5nqTBjxzxpD5f4+Z78nZ/x8nSIrNIbeBnTXVp9leqCA9wNNlBkJVfxT+1KuYx2tcTdb3PGNe8pk eARxDhE7d3jy8dZ01uJ/2Lh0DvCp3GYhwZRWzgJ6AgzxWbJcHuhl61Rs2BHH73C6EoHizMDsevAZi UtAar/Zw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t35Vj-00000009Rdw-3IEa; Tue, 22 Oct 2024 03:24:43 +0000 Received: from mail-m16.yeah.net ([220.197.32.19]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t35UC-00000009RKv-0uxC for linux-arm-kernel@lists.infradead.org; Tue, 22 Oct 2024 03:23:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yeah.net; s=s110527; h=Date:From:Subject:Message-ID:MIME-Version: Content-Type; bh=AmUReFKhicS3m0ObmDL8efshVJq3oQSu+lPrt4djDi4=; b=nVYp5HeqTZhDi4moSQB0yQLG02Kt7hakD7BwYxPin3OZUPF3IAXeNJ2KoGKaCI /dqoOMX1Rh+eX/9mMVM8EL37pHjU/vfXWntc+dTOP8m87BwGsdnv2vsSmft/XJ2R tdpNPWiJSS0sUqYJwaD7WrESDq3bIFdj9KVqP8NKGEnBU= Received: from dragon (unknown []) by gzsmtp2 (Coremail) with SMTP id Ms8vCgBXPrh_Ghdnp9yWAA--.5441S3; Tue, 22 Oct 2024 11:22:40 +0800 (CST) Date: Tue, 22 Oct 2024 11:22:38 +0800 From: Shawn Guo To: Marek Vasut Cc: linux-arm-kernel@lists.infradead.org, kernel@dh-electronics.com, Isaac Scott , Conor Dooley , Fabio Estevam , Krzysztof Kozlowski , Liu Ying , Pengutronix Kernel Team , Rob Herring , Sascha Hauer , Shawn Guo , Yannic Moog , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] arm64: dts: imx8mp-phyboard-pollux: Set Video PLL1 frequency to 506.8 MHz Message-ID: References: <20241017031146.157996-1-marex@denx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241017031146.157996-1-marex@denx.de> X-CM-TRANSID: Ms8vCgBXPrh_Ghdnp9yWAA--.5441S3 X-Coremail-Antispam: 1Uf129KBjvdXoWrur1DJrWxCF4kKF4kGFyDJrb_yoW3CwcE9F 1kuws7CrnxW34rJwnxtr15t3y2kw4UX3ykZr1xXw47XFyrGFWUJ3W09ryF9w15ZasIqasr Ja45Xay5Kwn8ujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU8kb1UUUUUU== X-Originating-IP: [117.62.23.175] X-CM-SenderInfo: pvkd40hjxrjqh1hdxhhqhw/1tbiAgqAZWcW3ka23AAAsu X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241021_202308_601047_4723C5E3 X-CRM114-Status: GOOD ( 10.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Oct 17, 2024 at 05:11:20AM +0200, Marek Vasut wrote: > The LVDS panel on this device uses 72.4 MHz pixel clock, set IMX8MP_VIDEO_PLL1 > to 72.4 * 7 = 506.8 MHz so the LDB serializer and LCDIFv3 scanout engine can > reach accurate pixel clock of exactly 72.4 MHz. > > Without this patch, the Video PLL1 frequency is the default set in imx8mp.dtsi > which is 1039.5 MHz, which divides down to inaccurate pixel clock of 74.25 MHz > which works for this particular panel by sheer chance. > > Stop taking that chance and set correct accurate pixel clock frequency instead. > > Fixes: 326d86e197fc ("arm64: dts: imx8mp-phyboard-pollux-rdk: add etml panel support") > Reported-by: Isaac Scott > Signed-off-by: Marek Vasut Applied, thanks!