From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-m16.yeah.net (mail-m16.yeah.net [220.197.32.19]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 99457139D for ; Tue, 22 Oct 2024 03:23:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.32.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729567394; cv=none; b=sVm4tATfTHQz+/G9y2NhTJ9JlQmS8z1DN38m84aoTL3GxuoT6cHadFJS1K4luG3Boqj0VcKKtd2rydXF0FPItW2jCa6XOaxfGvisZgBsD6xX768167/bNXjUDUmWkPTBQPB5B+ae8lhlgBbVHqORBhnMNt90Si6JXS+TlK3DHlY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729567394; c=relaxed/simple; bh=304yaoaCARna+FcF24l7FxM/Dgl17c7QokKKCoRlgGA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=QS3yQPN2eCfAh2HuY8rvjkiV5aDvk3e/vs4S//Tss0Ja750wsQGVDE+5uRKbRSIq+8lTq+vNyEf/E9OjBB/UkwaSYqdN9DtbdfP9toZrSwjwBA9+/XEQ+8xQ/ALUhHSHex3P4xDm/0+ZYauaizom1NSQVfIycFGGZaBWIFIz3Zk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yeah.net; spf=pass smtp.mailfrom=yeah.net; dkim=pass (1024-bit key) header.d=yeah.net header.i=@yeah.net header.b=nVYp5Heq; arc=none smtp.client-ip=220.197.32.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yeah.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yeah.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=yeah.net header.i=@yeah.net header.b="nVYp5Heq" 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> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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-CM-SenderInfo: pvkd40hjxrjqh1hdxhhqhw/1tbiAgqAZWcW3ka23AAAsu 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!