RE: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support

["Peng Fan (OSS)" <peng.fan@oss.nxp.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@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.

I put my dts diff here:
https://gist.github.com/MrVan/d73888d8273c43ea4a3b28fa668ca1d0
Not include vpu, lcdif, mipi, just gpc and blk-ctl.

Your dts has error, the vpu-g1/g2/h1 should use vpu-blk as parent power domain.
And the vpu-blk-ctl power domain changes as below:
power-domain-names = "vpumix", "vpu-g1", "vpu-g2", "vpu-h1";

Regards,
Peng.

> 
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.
> com%2Faford173%2Flinux%2Fblob%2Flinux-5.13.y-aford%2Farch%2Farm64%
> 2Fboot%2Fdts%2Ffreescale%2Fimx8mm.dtsi&amp;data=04%7C01%7Cpeng.f
> an%40nxp.com%7Ca5c04b8b13514290944008d91cc9d95f%7C686ea1d3bc2
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> QNHv8QVh2OcgMpA%3D&amp;reserved=0
> 
> 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
> > > >