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Date: Tue, 28 Mar 2023 02:15:00 +0000
From: Peng Fan <peng.fan@....com>
To: Greg Ungerer <gerg@...ux-m68k.org>,
"Peng Fan (OSS)" <peng.fan@....nxp.com>
CC: "Markus.Niebel@...tq-group.com" <Markus.Niebel@...tq-group.com>,
"aford173@...il.com" <aford173@...il.com>,
Aisheng Dong <aisheng.dong@....com>,
"alexander.stein@...tq-group.com" <alexander.stein@...tq-group.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"festevam@...il.com" <festevam@...il.com>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
"laurent.pinchart@...asonboard.com"
<laurent.pinchart@...asonboard.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
dl-linux-imx <linux-imx@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"marex@...x.de" <marex@...x.de>,
"paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"gerg@...nel.org" <gerg@...nel.org>
Subject: RE: [PATCH] arm64: dts: imx8mp: add vpu pgc nodes
> -----Original Message-----
> From: Greg Ungerer <gerg@...ux-m68k.org>
> Sent: 2023年3月27日 21:24
> To: Peng Fan <peng.fan@....com>; Peng Fan (OSS)
> <peng.fan@....nxp.com>
> Cc: Markus.Niebel@...tq-group.com; aford173@...il.com; Aisheng Dong
> <aisheng.dong@....com>; alexander.stein@...tq-group.com;
> devicetree@...r.kernel.org; festevam@...il.com; kernel@...gutronix.de;
> krzysztof.kozlowski+dt@...aro.org; l.stach@...gutronix.de;
> laurent.pinchart@...asonboard.com; linux-arm-kernel@...ts.infradead.org;
> dl-linux-imx <linux-imx@....com>; linux-kernel@...r.kernel.org;
> marex@...x.de; paul.elder@...asonboard.com; robh+dt@...nel.org;
> s.hauer@...gutronix.de; shawnguo@...nel.org; gerg@...nel.org
> Subject: Re: [PATCH] arm64: dts: imx8mp: add vpu pgc nodes
>
> Hi Peng,
>
> On 27/3/23 20:01, Peng Fan wrote:
> >> Subject: Re: [PATCH] arm64: dts: imx8mp: add vpu pgc nodes
> >>
> >> On 22/8/22 14:45, Peng Fan wrote:
> >>> Add i.MX8MP PGC nodes for vpu, which are used to supply power for
> VPU.
> >>>
> >>> Signed-off-by: Peng Fan <peng.fan@....com>
> >>> Signed-off-by: Shawn Guo <shawnguo@...nel.org>
> >>> ---
> >>> arch/arm64/boot/dts/freescale/imx8mp.dtsi | 27
> >>> +++++++++++++++++++++++
> >>> 1 file changed, 27 insertions(+)
> >>>
> >>> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> >>> b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> >>> index 0b165f98a82c..34af983b0210 100644
> >>> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> >>> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> >>> @@ -598,6 +598,33 @@ pgc_ispdwp: power-domain@18 {
> >>> reg =
> >> <IMX8MP_POWER_DOMAIN_MEDIAMIX_ISPDWP>;
> >>> clocks = <&clk
> IMX8MP_CLK_MEDIA_ISP_ROOT>;
> >>> };
> >>> +
> >>> + pgc_vpumix: power-domain@19 {
> >>> + #power-domain-cells = <0>;
> >>> + reg = <IMX8MP_POWER_DOMAIN_VPUMIX>;
> >>> + clocks =<&clk IMX8MP_CLK_VPU_ROOT>;
> >>> + };
> >>> +
> >>> + pgc_vpu_g1: power-domain@20 {
> >>> + #power-domain-cells = <0>;
> >>> + power-domains = <&pgc_vpumix>;
> >>> + reg = <IMX8MP_POWER_DOMAIN_VPU_G1>;
> >>> + clocks = <&clk IMX8MP_CLK_VPU_G1_ROOT>;
> >>> + };
> >>> +
> >>> + pgc_vpu_g2: power-domain@21 {
> >>> + #power-domain-cells = <0>;
> >>> + power-domains = <&pgc_vpumix>;
> >>> + reg = <IMX8MP_POWER_DOMAIN_VPU_G2>;
> >>> + clocks = <&clk IMX8MP_CLK_VPU_G2_ROOT>;
> >>> + };
> >>> +
> >>> + pgc_vpu_vc8000e: power-domain@22 {
> >>> + #power-domain-cells = <0>;
> >>> + power-domains = <&pgc_vpumix>;
> >>> + reg =
> >> <IMX8MP_POWER_DOMAIN_VPU_VC8000E>;
> >>> + clocks = <&clk
> >> IMX8MP_CLK_VPU_VC8KE_ROOT>;
> >>> + };
> >>> };
> >>> };
> >>> };
> >>
> >> This change causes new error messages to come out during boot, for
> >> example:
> >>
> >> ...
> >> imx-pgc imx-pgc-domain.8: failed to command PGC
> >> imx-pgc imx-pgc-domain.8: failed to command PGC
> >> imx-pgc imx-pgc-domain.8: failed to command PGC
> >> 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 197,
> >> base_baud =
> >> 1500000) is a IMX
> >> ...
> >> hwmon hwmon1: temp1_input not attached to any thermal zone
> >> imx-pgc imx-pgc-domain.8: failed to command PGC
> >> imx-pgc imx-pgc-domain.8: failed to command PGC
> >> imx-pgc imx-pgc-domain.8: failed to command PGC
> >> ...
> >>
> >> They don't seem to cause any problems on the hardware I am using,
> >> well, at least not that I have found so far.
> >>
> >> This first appeared for me in linux-6.1. But it is the same in todays
> >> linux 6.3- rc4. Reverting this change (not completely trivial due to
> >> a couple of commits after it that rely on it) fixes it - no more errors.
> > [Peng Fan]
> >
> > The VPU BLK CTRL seems not enabled.
>
> How to enable it?
> I have the blk-ctrl config options enabled:
>
> #
> # i.MX SoC drivers
> #
> CONFIG_IMX_GPCV2_PM_DOMAINS=y
> CONFIG_SOC_IMX8M=y
> CONFIG_SOC_IMX9=y
> CONFIG_IMX8M_BLK_CTRL=y
> CONFIG_IMX9_BLK_CTRL=y
> # end of i.MX SoC drivers
>
> Running with the full arm64 defconfig and using the imx8mp-evk.dtb still
> outputs these messages:
>
> [ 18.150679] imx-pgc imx-pgc-domain.8: failed to command PGC
> [ 18.159241] imx-pgc imx-pgc-domain.8: failed to command PGC
> [ 18.167822] imx-pgc imx-pgc-domain.8: failed to command PGC
>
> Or do you mean something more fundamental, like the hardware block not
> being enabled by boot loader? (Something to keep in mind is that the
> platform I am using has no video output, only serial console).
[Peng Fan]
The imx8mp vpu blk ctrl already in imx8m-blk-ctrl.c, so it should work.
Have you enabled imx8mp interconnect driver?
CONFIG_INTERCONNECT_IMX8MP
Regards,
Peng.
>
> Regards
> Greg
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