linux-kernel - Re: [PATCH V7 4/4] soc: imx: Add blk-ctl driver for i.MX8MM

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Date:   Mon, 28 Jun 2021 12:59:31 +0200
From:   Marek Vasut <marex@...x.de>
To:     Adam Ford <aford173@...il.com>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Lucas Stach <l.stach@...gutronix.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Guido Günther <agx@...xcpu.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jacky Bai <ping.bai@....com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Abel Vesa <abel.vesa@....com>, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V7 4/4] soc: imx: Add blk-ctl driver for i.MX8MM

On 6/14/21 8:07 PM, Adam Ford wrote:
> On Sat, Jun 12, 2021 at 7:58 AM Peng Fan (OSS) <peng.fan@....nxp.com> wrote:
>>
>> From: Peng Fan <peng.fan@....com>
>>
>> The i.MX8MM SoC has dispmix BLK-CTL and vpumix BLK-CTL, so we add
>> that support in this driver.
>>
>> Reviewed-by: Abel Vesa <abel.vesa@....com>
>> Signed-off-by: Peng Fan <peng.fan@....com>
> 
> Maybe my TF-A is too old, but I am not able to wake the device from
> suspend-to-ram with this series.  I used the device tree from [1] to
> enable both the GPCv2 and the blk-ctl stuff.
> 
> [1] - https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210604111005.6804-1-peng.fan@oss.nxp.com/
> 
> I based both off Shawn's for-next branch.

I also ran into issues with this, although it could also be related to 
GPCv2. On MX8MM , the system sometimes hangs when bringing up the GPCv2 
power domain 6 (VPUMIX). It seems that the GPCv2 driver sets 
GPC_PU_PGC_SW_PUP_REQ register to 0x100 to bring up the VPUMIX and the 
bit never self-clears. After that, it seems the entire GPC locks up. 
Have you ever seen that kind of behavior ?