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Subject: Re: [PATCH V4 07/11] arm64: dts: imx8mq: Enable both G1 and G2
 VPU's with vpu-blk-ctrl
From:   Martin Kepplinger <martin.kepplinger@puri.sm>
To:     Adam Ford <aford173@gmail.com>,
        Lucas Stach <l.stach@pengutronix.de>
Cc:     linux-media <linux-media@vger.kernel.org>,
        Adam Ford-BE <aford@beaconembedded.com>,
        Chris Healy <cphealy@gmail.com>,
        kernel test robot <lkp@intel.com>,
        Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "open list:HANTRO VPU CODEC DRIVER" 
        <linux-rockchip@lists.infradead.org>,
        devicetree <devicetree@vger.kernel.org>,
        arm-soc <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "open list:STAGING SUBSYSTEM" <linux-staging@lists.linux.dev>
Date:   Tue, 26 Apr 2022 12:28:20 +0200
In-Reply-To: <CAHCN7xKEWT=-ujUD0KC9O=VUyCDSGzwbB1_dC51_k=Hx3i6+bg@mail.gmail.com>
References: <20220125171129.472775-1-aford173@gmail.com>
         <20220125171129.472775-8-aford173@gmail.com>
         <d6c5c5663f8ae904d409240063295cf516e17dd1.camel@puri.sm>
         <4b958892ba788a0e9e73a9135c305aacbe33294d.camel@pengutronix.de>
         <CAHCN7xKEWT=-ujUD0KC9O=VUyCDSGzwbB1_dC51_k=Hx3i6+bg@mail.gmail.com>
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Am Montag, dem 25.04.2022 um 10:47 -0500 schrieb Adam Ford:
> 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.
> 

it would be a temporary workaround, but I want to remind you that it
wouldn't help much: even if suspending "works" again, system resume is
broken on imx8mq since
https://lore.kernel.org/all/a20ecd639f8e8b7fa4a9bed7a8e9590225262784.camel@puri.sm/

Of course I did the current tests on v5.18-rc4 without any gpcv2
changes to mainline. But for resume to work I need the one revert from
the above link (plus a minor additional hack) already.

If we'd have that working in mainline I could make sure it stays that
way :)

                           martin