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Message-ID: <CAHCN7xLTjE82EnzRXW84e_Lm63+hxfOeFXSdoZmVe6ujs3F2Pw@mail.gmail.com>
Date: Fri, 21 May 2021 21:32:18 -0500
From: Adam Ford <aford173@...il.com>
To: Peng Fan <peng.fan@....com>
Cc: "Peng Fan (OSS)" <peng.fan@....nxp.com>,
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>,
dl-linux-imx <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>,
Marek Vasut <marex@...x.de>,
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>
Subject: Re: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support
On Fri, May 21, 2021 at 7:54 PM Peng Fan <peng.fan@....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@....nxp.com>
> > wrote:
> > >
> > > From: Peng Fan <peng.fan@....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@...28000 {
> > > 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
> > >
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