linux-kernel - Re: [PATCHv1] ARM: dts/imx6q-bx50v3: Set display interface clock parents

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Date:   Wed, 20 May 2020 10:48:36 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Sebastian Reichel <sre@...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>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        Robert Beckett <bob.beckett@...labora.com>,
        stable@...r.kernel.org, Ian Ray <ian.ray@...com>
Subject: Re: [PATCHv1] ARM: dts/imx6q-bx50v3: Set display interface clock
 parents

On Thu, May 14, 2020 at 07:02:37PM +0200, Sebastian Reichel wrote:
> From: Robert Beckett <bob.beckett@...labora.com>
> 
> Avoid LDB and IPU DI clocks both using the same parent. LDB requires
> pasthrough clock to avoid breaking timing while IPU DI does not.
> 
> Force IPU DI clocks to use IMX6QDL_CLK_PLL2_PFD0_352M as parent
> and LDB to use IMX6QDL_CLK_PLL5_VIDEO_DIV.
> 
> This fixes an issue where attempting atomic modeset while using
> HDMI and display port at the same time causes LDB clock programming
> to destroy the programming of HDMI that was done during the same
> modeset.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
> [Use IMX6QDL_CLK_PLL2_PFD0_352M instead of IMX6QDL_CLK_PLL2_PFD2_396M
>  originally chosen by Robert Beckett to avoid affecting eMMC clock
>  by DRM atomic updates]
> Signed-off-by: Ian Ray <ian.ray@...com>
> [Squash Robert's and Ian's commits for bisectability, update patch
>  description and add stable tag]
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>

Applied, thanks.