Re: [PATCH V8 0/4] soc: imx: add i.MX BLK-CTL support

[Adam Ford <aford173@gmail.com>]

On Wed, Jun 30, 2021 at 4:34 AM Peng Fan (OSS) <peng.fan@oss.nxp.com> wrote:
>
> > Subject: Re: [PATCH V8 0/4] soc: imx: add i.MX BLK-CTL support
> >
> > On Tue, Jun 29, 2021 at 1:56 AM Peng Fan (OSS) <peng.fan@oss.nxp.com>
> > wrote:
> > >
> > > From: Peng Fan <peng.fan@nxp.com>
> > >
> > > V8:
> > > Revert one change in v7, force goto disable_clk for handshake when
> > > power on in patch 3 One minor update to use if{} else {}, not if{};
> > > if{}; in patch 3 Typo Hankshake->Handshake
> > >
> > I am using ATF, branch lf_v2.4, from the NXP code aurora repo with U-Boot
> > v2021.07-rc5
> >
> > I applied this patch against linux-next, I applied the pgc patches [1], and the
> > suggested power-domains to the otg1 and otg2 nodes.
> > I am able to boot the device and use USB, but with this applied, I cannot wake
> > from sleep.  If I revert this, the system wakes from sleep again.
>
> I just tried linux-next without this patch on iMX8MM EVK, suspend/resume
> not work. Per my last test, it works before. Not sure what changed in kernel.
>
> Which kernel are you using, any commit or git repo? I could try on imx8mm
> evk and debug the issue you see.

I used kernel-next,
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
commit 889bab4c367a0ef58208fd80fafa74bb6e2dca26 (tag: next-20210621)

I then applied the GPCv2 patch that Marek sent.  You were CC'd on the
e-mail from Marek, but I can forward the patch to you if you can't
find it.
I tested his patch and I was able to suspend-to-RAM and resume.
Once I was comfortable that it worked, I then applied your patch
series for the blk-ctl.
With the blk-ctl series applied, the suspend-resume stopped working.

adam
>
> Thanks,
> Peng.
>
> >
> > [1] -
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatch
> > work.kernel.org%2Fproject%2Flinux-arm-kernel%2Fpatch%2F202106041110
> > 05.6804-1-peng.fan%40oss.nxp.com%2F&amp;data=04%7C01%7Cpeng.fan%
> > 40nxp.com%7Caccded5458c049d67fa308d93b0182d9%7C686ea1d3bc2b4c6
> > fa92cd99c5c301635%7C0%7C0%7C637605699944911752%7CUnknown%7C
> > TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL
> > CJXVCI6Mn0%3D%7C1000&amp;sdata=Kf6orRXmScWHDTgD2FOV8OBsgG0p
> > GVs1byVZTHT0gVI%3D&amp;reserved=0
> >
> > I have not enabled video, GPU, VPU nor CSI.
> >
> > Just in case there might be a power-domain dependency missing, here is my
> > power-domain dump:
> >
> > root@beacon-imx8mm-kit:~# cat
> > /sys/kernel/debug/pm_genpd/pm_genpd_summary
> > domain                          status          children
> >             performance
> >     /device                                             runtime
> > status
> > ---------------------------------------------------------------------------------------------
> > -
> > vpu-h1                          off-0
> >             0
> >
> > VPU_BLK_CTL_H1
> >     /devices/genpd:3:imx-vpumix-blk-ctl.2               suspended
> >             0
> > vpu-g2                          off-0
> >             0
> >
> > VPU_BLK_CTL_G2
> >     /devices/genpd:2:imx-vpumix-blk-ctl.0               suspended
> >             0
> > vpu-g1                          off-0
> >             0
> >
> > VPU_BLK_CTL_G1
> >     /devices/genpd:1:imx-vpumix-blk-ctl.1               suspended
> >             0
> > mipi                            off-0
> >             0
> >                                                 MIPI_DSI,
> > MIPI_CSI
> >     /devices/genpd:1:imx-dispmix-blk-ctl.2              suspended
> >             0
> >     /devices/genpd:1:imx-dispmix-blk-ctl.3              suspended
> >             0
> > vpumix                          off-0
> >             0
> >
> > VPU_BLK_CTL_BUS
> >     /devices/genpd:0:imx-vpumix-blk-ctl.3               suspended
> >             0
> > gpu                             off-0
> >             0
> > VPU_BLK_CTL_BUS                 off-0
> >             0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.7
> >  suspended                  0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.8
> >  suspended                  0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.9
> >  suspended                  0
> > VPU_BLK_CTL_H1                  off-0
> >             0
> > VPU_BLK_CTL_G1                  off-0
> >             0
> > VPU_BLK_CTL_G2                  off-0
> >             0
> > DISPMIX_BUS                     off-0
> >             0
> >                                                 CSI_BRIDGE,
> > LCDIF
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.11
> >  suspended                  0
> > MIPI_CSI                        off-0
> >             0
> > MIPI_DSI                        off-0
> >             0
> > LCDIF                           off-0
> >             0
> > CSI_BRIDGE                      off-0
> >             0
> > dispmix                         off-0
> >             0
> >                                                 DISPMIX_BUS
> >     /devices/genpd:0:imx-dispmix-blk-ctl.4              suspended
> >             0
> > gpumix                          off-0
> >             0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.5
> >  suspended                  0
> > usb-otg2                        on
> >             0
> >     /devices/platform/soc@0/32c00000.bus/32e50000.usb   active
> >             0
> > usb-otg1                        on
> >             0
> >     /devices/platform/soc@0/32c00000.bus/32e40000.usb   active
> >             0
> > pcie                            off-0
> >             0
> > hsiomix                         on
> >             0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.1
> >  suspended                  0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.2
> >  active                     0
> >
> > /devices/platform/soc@0/30000000.bus/303a0000.gpc/imx-pgc-domain.3
> >  active                     0
> >
> >
> >
> > > V7:
> > >  patch 2: update patch title per Shawn  Patch 3: Addressed several
> > > comments from Shawn
> > >
> > > V6:
> > >  Thanks for Adam's report on V5.
> > >  Resolve the error message dump, it is the child device reuse  the
> > > parent device node and matches the parent driver.
> > >  Filled the remove function for child device.
> > >  A diff dts file for upstream:
> > >
> > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgist
> > > .github.com%2FMrVan%2Fd73888d8273c43ea4a3b28fa668ca1d0&amp;dat
> > a=04%7C0
> > >
> > 1%7Cpeng.fan%40nxp.com%7Caccded5458c049d67fa308d93b0182d9%7C68
> > 6ea1d3bc
> > >
> > 2b4c6fa92cd99c5c301635%7C0%7C0%7C637605699944911752%7CUnknow
> > n%7CTWFpbG
> > >
> > Zsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6
> > Mn0%
> > >
> > 3D%7C1000&amp;sdata=9FcnPd4nwmdjOqrQCTz0YNgUmVQ9UzTHpfh33LKI
> > 7cs%3D&amp
> > > ;reserved=0
> > >
> > > 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>;
> > >         };
> > >
> > >         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
> > >   dt-bindings: soc: imx: 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                     | 324
> > ++++++++++++++++++
> > >  drivers/soc/imx/blk-ctl.h                     |  85 +++++
> > >  include/dt-bindings/power/imx8mm-power.h      |  13 +
> > >  6 files changed, 628 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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