Re: [PATCH V4 07/11] arm64: dts: imx8mq: Enable both G1 and G2 VPU's with vpu-blk-ctrl

[Adam Ford <aford173@gmail.com>]

On Mon, Apr 25, 2022 at 10:34 AM Lucas Stach <l.stach@pengutronix.de> wrote:
>
> Hi Martin,
>
> Am Montag, dem 25.04.2022 um 17:22 +0200 schrieb Martin Kepplinger:
> > Am Dienstag, dem 25.01.2022 um 11:11 -0600 schrieb Adam Ford:
> > > With the Hantro G1 and G2 now setup to run independently, update
> > > the device tree to allow both to operate.  This requires the
> > > vpu-blk-ctrl node to be configured.  Since vpu-blk-ctrl needs
> > > certain clock enabled to handle the gating of the G1 and G2
> > > fuses, the clock-parents and clock-rates for the various VPU's
> > > to be moved into the pgc_vpu because they cannot get re-parented
> > > once enabled, and the pgc_vpu is the highest in the chain.
> > >
> > > Signed-off-by: Adam Ford <aford173@gmail.com>
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > index 2df2510d0118..549b2440f55d 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > @@ -737,7 +737,21 @@ pgc_gpu: power-domain@5 {
> > >                                         pgc_vpu: power-domain@6 {
> > >                                                 #power-domain-cells =
> > > <0>;
> > >                                                 reg =
> > > <IMX8M_POWER_DOMAIN_VPU>;
> > > -                                               clocks = <&clk
> > > IMX8MQ_CLK_VPU_DEC_ROOT>;
> > > +                                               clocks = <&clk
> > > IMX8MQ_CLK_VPU_DEC_ROOT>,
> > > +                                                        <&clk
> > > IMX8MQ_CLK_VPU_G1_ROOT>,
> > > +                                                        <&clk
> > > IMX8MQ_CLK_VPU_G2_ROOT>;
> > > +                                               assigned-clocks =
> > > <&clk IMX8MQ_CLK_VPU_G1>,
> > > +
> > > <&clk IMX8MQ_CLK_VPU_G2>,
> > > +
> > > <&clk IMX8MQ_CLK_VPU_BUS>,
> > > +
> > > <&clk IMX8MQ_VPU_PLL_BYPASS>;
> > > +                                               assigned-clock-
> > > parents = <&clk IMX8MQ_VPU_PLL_OUT>,
> > > +
> > >     <&clk IMX8MQ_VPU_PLL_OUT>,
> > > +
> > >     <&clk IMX8MQ_SYS1_PLL_800M>,
> > > +
> > >     <&clk IMX8MQ_VPU_PLL>;
> > > +                                               assigned-clock-rates
> > > = <600000000>,
> > > +
> > >   <600000000>,
> > > +
> > >   <800000000>,
> > > +
> > >   <0>;
> > >                                         };
> > >
> > >                                         pgc_disp: power-domain@7 {
> > > @@ -1457,30 +1471,31 @@ usb3_phy1: usb-phy@382f0040 {
> > >                         status = "disabled";
> > >                 };
> > >
> > > -               vpu: video-codec@38300000 {
> > > -                       compatible = "nxp,imx8mq-vpu";
> > > -                       reg = <0x38300000 0x10000>,
> > > -                             <0x38310000 0x10000>,
> > > -                             <0x38320000 0x10000>;
> > > -                       reg-names = "g1", "g2", "ctrl";
> > > -                       interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
> > > -                                    <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> > > -                       interrupt-names = "g1", "g2";
> > > +               vpu_g1: video-codec@38300000 {
> > > +                       compatible = "nxp,imx8mq-vpu-g1";
> > > +                       reg = <0x38300000 0x10000>;
> > > +                       interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
> > > +                       clocks = <&clk IMX8MQ_CLK_VPU_G1_ROOT>;
> > > +                       power-domains = <&vpu_blk_ctrl
> > > IMX8MQ_VPUBLK_PD_G1>;
> > > +               };
> > > +
> > > +               vpu_g2: video-codec@38310000 {
> > > +                       compatible = "nxp,imx8mq-vpu-g2";
> > > +                       reg = <0x38310000 0x10000>;
> > > +                       interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> > > +                       clocks = <&clk IMX8MQ_CLK_VPU_G2_ROOT>;
> > > +                       power-domains = <&vpu_blk_ctrl
> > > IMX8MQ_VPUBLK_PD_G2>;
> > > +               };
> > > +
> > > +               vpu_blk_ctrl: blk-ctrl@38320000 {
> > > +                       compatible = "fsl,imx8mq-vpu-blk-ctrl";
> > > +                       reg = <0x38320000 0x100>;
> > > +                       power-domains = <&pgc_vpu>, <&pgc_vpu>,
> > > <&pgc_vpu>;
> > > +                       power-domain-names = "bus", "g1", "g2";
> > >                         clocks = <&clk IMX8MQ_CLK_VPU_G1_ROOT>,
> > > -                                <&clk IMX8MQ_CLK_VPU_G2_ROOT>,
> > > -                                <&clk IMX8MQ_CLK_VPU_DEC_ROOT>;
> > > -                       clock-names = "g1", "g2", "bus";
> > > -                       assigned-clocks = <&clk IMX8MQ_CLK_VPU_G1>,
> > > -                                         <&clk IMX8MQ_CLK_VPU_G2>,
> > > -                                         <&clk IMX8MQ_CLK_VPU_BUS>,
> > > -                                         <&clk
> > > IMX8MQ_VPU_PLL_BYPASS>;
> > > -                       assigned-clock-parents = <&clk
> > > IMX8MQ_VPU_PLL_OUT>,
> > > -                                                <&clk
> > > IMX8MQ_VPU_PLL_OUT>,
> > > -                                                <&clk
> > > IMX8MQ_SYS1_PLL_800M>,
> > > -                                                <&clk
> > > IMX8MQ_VPU_PLL>;
> > > -                       assigned-clock-rates = <600000000>,
> > > <600000000>,
> > > -                                              <800000000>, <0>;
> > > -                       power-domains = <&pgc_vpu>;
> > > +                                <&clk IMX8MQ_CLK_VPU_G2_ROOT>;
> > > +                       clock-names = "g1", "g2";
> > > +                       #power-domain-cells = <1>;
> > >                 };
> > >
> > >                 pcie0: pcie@33800000 {
> >
> > With this update, when testing suspend to ram on imx8mq, I get:
> >
> > buck4: failed to disable: -ETIMEDOUT
> >
> > where buck4 is power-supply of pgc_vpu. And thus the transition to
> > suspend (and resuming) fails.
> >
> > Have you tested system suspend after the imx8m-blk-ctrl update on
> > imx8mq?
>
> I haven't tested system suspend, don't know if anyone else did. However
> I guess that this is just uncovering a preexisting issue in the system
> suspend sequencing, which you would also hit if the video decoders were
> active at system suspend time.

I have not tested it either.

>
> My guess is that the regulator disable fails, due to the power domains
> being disabled quite late in the suspend sequence, where i2c
> communication with the PMIC is no longer possible due to i2c being
> suspended already or something like that. Maybe you can dig in a bit on
> the actual sequence on your system and we can see how we can rework
> things to suspend the power domains at a time where communication with
> the PMIC is still possible?

In the meantime, should we mark the regulator with regulator-always-on
so it doesn't attempt to power it down?  It might not be ideal,but it
might be enough to let it suspend.

adam
>
> Regards,
> Lucas
>