linux-kernel - Re: [PATCH] ARM: dts: imx6dl-yapp4: Do not allow PM to switch PU regulator off on Q/QP

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Date:   Mon, 24 Oct 2022 10:25:34 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Petr Benes <petr.benes@...ft.com>
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>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        petrben@...il.com, stable@...r.kernel.org,
        Michal Vokáč <michal.vokac@...ft.com>
Subject: Re: [PATCH] ARM: dts: imx6dl-yapp4: Do not allow PM to switch PU
 regulator off on Q/QP

On Tue, Oct 04, 2022 at 05:39:20PM +0200, Petr Benes wrote:
> Fix our design flaw in supply voltage distribution on the Quad and QuadPlus
> based boards.
> 
> The problem is that we supply the SoC cache (VDD_CACHE_CAP) from VDD_PU
> instead of VDD_SOC. The VDD_PU internal regulator can be disabled by PM
> if VPU or GPU is not used. If that happens the system freezes. To prevent
> that configure the reg_pu regulator to be always on.
> 
> Fixes: 0de4ab81ab26 ("ARM: dts: imx6dl-yapp4: Add Y Soft IOTA Crux/Crux+ board")
> Cc: petrben@...il.com
> Cc: stable@...r.kernel.org
> Signed-off-by: Petr Benes <petr.benes@...ft.com>
> Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>

Applied, thanks!