linux-kernel - Re: [PATCH v2] arm64: dts: imx8mq: Add clock parents for mipi dphy

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Message-ID: <20210111002530.GQ28365@dragon>
Date:   Mon, 11 Jan 2021 08:25:30 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Guido Günther <agx@...xcpu.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Peng Fan <peng.fan@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        Anson Huang <Anson.Huang@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Shengjiu Wang <shengjiu.wang@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: imx8mq: Add clock parents for mipi dphy

On Sun, Jan 10, 2021 at 05:55:51PM +0100, Guido Günther wrote:
> This makes sure the clock tree setup for the dphy is not dependent on
> other components.
> 
> Without this change bringing up the display can fail like
> 
>   kernel: phy phy-30a00300.dphy.2: Invalid CM/CN/CO values: 165/217/1
>   kernel: phy phy-30a00300.dphy.2: for hs_clk/ref_clk=451656000/593999998 ~ 165/217
> 
> if LCDIF doesn't set up that part of the clock tree first. This was
> noticed when testing the Librem 5 devkit with defconfig. It doesn't
> happen when modules are built in.
> 
> Signed-off-by: Guido Günther <agx@...xcpu.org>

Applied, thanks.