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From:   Adam Ford <aford173@gmail.com>
Date:   Fri, 21 May 2021 21:32:18 -0500
Message-ID: <CAHCN7xLTjE82EnzRXW84e_Lm63+hxfOeFXSdoZmVe6ujs3F2Pw@mail.gmail.com>
Subject: Re: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support
To:     Peng Fan <peng.fan@nxp.com>
Cc:     "Peng Fan (OSS)" <peng.fan@oss.nxp.com>,
        Rob Herring <robh+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Sascha Hauer <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        dl-linux-imx <linux-imx@nxp.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Lucas Stach <l.stach@pengutronix.de>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        =?UTF-8?Q?Guido_G=C3=BCnther?= <agx@sigxcpu.org>,
        Marek Vasut <marex@denx.de>,
        Andrey Smirnov <andrew.smirnov@gmail.com>,
        devicetree <devicetree@vger.kernel.org>,
        arm-soc <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Jacky Bai <ping.bai@nxp.com>,
        Schrempf Frieder <frieder.schrempf@kontron.de>,
        Abel Vesa <abel.vesa@nxp.com>
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On Fri, May 21, 2021 at 7:54 PM Peng Fan <peng.fan@nxp.com> wrote:
>
> > Subject: Re: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support
> >
> > On Fri, May 21, 2021 at 5:27 AM Peng Fan (OSS) <peng.fan@oss.nxp.com>
> > wrote:
> > >
> > > From: Peng Fan <peng.fan@nxp.com>
> > >
> > > V5:
> > >  Rework the blk-ctl driver to let sub-PGC use blk-ctl as parent power
> > > domain to fix the potential handshake issue.
> > >  I still keep R-b/A-b tag for Patch 1,2,4, since very minor changes  I
> > > only drop R-b tag for Patch 3, since it has big change.
> > >  An example, the pgc_mipi not take pgc_dispmix as parent:
> > >
> > >         pgc_dispmix: power-domain@10 {
> > >                 #power-domain-cells = <0>;
> > >                 reg = <IMX8MM_POWER_DOMAIN_DISPMIX>;
> > >                 clocks = <&clk IMX8MM_CLK_DISP_ROOT>,
> > >                          <&clk IMX8MM_CLK_DISP_AXI_ROOT>,
> > >                          <&clk IMX8MM_CLK_DISP_APB_ROOT>;
> > >         };
> > >
> > >         pgc_mipi: power-domain@11 {
> > >                 #power-domain-cells = <0>;
> > >                 reg = <IMX8MM_POWER_DOMAIN_MIPI>;
> > >                 power-domains = <&dispmix_blk_ctl
> > > IMX8MM_BLK_CTL_PD_DISPMIX_BUS>;
> >
> > With this change, I get a bunch of errors on boot.  The list of power-domains
> > appear correct on the surface, but it also has trouble waking from sleep.
> >
> > [    0.695947] imx8mm-blk-ctl imx-dispmix-blk-ctl.0: invalid resource
> > [    0.702849] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.0 failed
> > with error -22
> > [    0.711259] imx8mm-blk-ctl imx-dispmix-blk-ctl.1: invalid resource
> > [    0.716451] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.1 failed
> > with error -22
> > [    0.724856] imx8mm-blk-ctl imx-dispmix-blk-ctl.2: invalid resource
> > [    0.730097] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.2 failed
> > with error -22
> > [    0.738398] imx8mm-blk-ctl imx-dispmix-blk-ctl.3: invalid resource
> > [    0.743747] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.3 failed
> > with error -22
>
> It is just the imx8mm-blk-ctl driver matches with the new created
> child device, because the child device points the of_node of the parent
> device.
> But this error will not affect functionality.
> I'll resolve this issue and send out v6.
> >
> > If I have a wrong device tree configuration, can you please post an updated
> > device tree?  I don't think an official patch for original pgc's were pushed as
> > part of either series. I used this e-mail as the patch to enable the blk-ctl.
>
> Do you have an device tree, I could give a look.

I have a git repo where I've been collecting the various power domain
patches.  I have updated the imx8mn blk-ctl and device trees as well
in that same repo.

https://github.com/aford173/linux/blob/linux-5.13.y-aford/arch/arm64/boot/dts/freescale/imx8mm.dtsi

thanks for looking at this.

adam
>
> Regards,
> Peng.
>
> >
> > thanks,
> >
> > adam
> >
> > >         };
> > >
> > >         dispmix_blk_ctl: clock-controller@32e28000 {
> > >                 compatible = "fsl,imx8mm-dispmix-blk-ctl", "syscon";
> > >                 reg = <0x32e28000 0x100>;
> > >                 #power-domain-cells = <1>;
> > >                 power-domains = <&pgc_dispmix>, <&pgc_mipi>;
> > >                 power-domain-names = "dispmix", "mipi";
> > >                 clocks = <&clk IMX8MM_CLK_DISP_ROOT>, <&clk
> > IMX8MM_CLK_DISP_AXI_ROOT>,
> > >                          <&clk IMX8MM_CLK_DISP_APB_ROOT>;
> > >         };
> > >
> > > V4:
> > >  Add R-b tag
> > >  Typo fix
> > >  Update the power domain macro names Per Abel and Frieder
> > >
> > > V3:
> > >  Add explaination for not listing items in patch 2 commit log Per Rob.
> > >  Addressed comments from Lucas and Frieder on patch [3,4].
> > >  A few comments from Jacky was ignored, because following gpcv2
> > > coding style.
> > >
> > > V2:
> > >  Fix yaml check failure.
> > >
> > > Previously there is an effort from Abel that take BLK-CTL as clock
> > > provider, but it turns out that there is A/B lock issue and we are not
> > > able resolve that.
> > >
> > > Per discuss with Lucas and Jacky, we made an agreement that take
> > > BLK-CTL as a power domain provider and use GPC's domain as parent, the
> > > consumer node take BLK-CTL as power domain input.
> > >
> > > This patchset has been tested on i.MX8MM EVK board, but one hack is
> > > not included in the patchset is that the DISPMIX BLK-CTL
> > > MIPI_M/S_RESET not implemented. Per Lucas, we will finally have a MIPI
> > > DPHY driver, so fine to leave it.
> > >
> > > Thanks for Lucas's suggestion, Frieder Schrempf for collecting all the
> > > patches, Abel's previous BLK-CTL work, Jacky Bai on help debug issues.
> > >
> > >
> > > Peng Fan (4):
> > >   dt-bindings: power: Add defines for i.MX8MM BLK-CTL power domains
> > >   Documentation: bindings: clk: Add bindings for i.MX BLK_CTL
> > >   soc: imx: Add generic blk-ctl driver
> > >   soc: imx: Add blk-ctl driver for i.MX8MM
> > >
> > >  .../bindings/soc/imx/fsl,imx-blk-ctl.yaml     |  66 ++++
> > >  drivers/soc/imx/Makefile                      |   2 +-
> > >  drivers/soc/imx/blk-ctl-imx8mm.c              | 139 ++++++++
> > >  drivers/soc/imx/blk-ctl.c                     | 311
> > ++++++++++++++++++
> > >  drivers/soc/imx/blk-ctl.h                     |  85 +++++
> > >  include/dt-bindings/power/imx8mm-power.h      |  13 +
> > >  6 files changed, 615 insertions(+), 1 deletion(-)  create mode 100644
> > > Documentation/devicetree/bindings/soc/imx/fsl,imx-blk-ctl.yaml
> > >  create mode 100644 drivers/soc/imx/blk-ctl-imx8mm.c  create mode
> > > 100644 drivers/soc/imx/blk-ctl.c  create mode 100644
> > > drivers/soc/imx/blk-ctl.h
> > >
> > > --
> > > 2.30.0
> > >