linux-kernel - RE: [PATCH v2 5/7] arm64: dts: imx8mp: add the iMX8MP PCIe support

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Message-ID: <AS8PR04MB8676F9A410442049E3DCA1F68CF39@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date:   Mon, 18 Apr 2022 04:55:33 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "alexander.stein@...tq-group.com" <alexander.stein@...tq-group.com>
CC:     "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH v2 5/7] arm64: dts: imx8mp: add the iMX8MP PCIe support

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2022年4月15日 5:03
> To: Hongxing Zhu <hongxing.zhu@....com>; p.zabel@...gutronix.de;
> bhelgaas@...gle.com; lorenzo.pieralisi@....com; robh@...nel.org;
> shawnguo@...nel.org; vkoul@...nel.org; alexander.stein@...tq-group.com
> Cc: linux-phy@...ts.infradead.org; devicetree@...r.kernel.org;
> linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>
> Subject: Re: [PATCH v2 5/7] arm64: dts: imx8mp: add the iMX8MP PCIe
> support
> 
> Am Montag, dem 07.03.2022 um 17:07 +0800 schrieb Richard Zhu:
> > Add the i.MX8MP PCIe support.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 46
> > ++++++++++++++++++++++-
> >  1 file changed, 45 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > index b40a5646f205..e7b3d8029e34 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > @@ -5,6 +5,7 @@
> >
> >  #include <dt-bindings/clock/imx8mp-clock.h>
> >  #include <dt-bindings/power/imx8mp-power.h>
> > +#include <dt-bindings/reset/imx8mp-reset.h>
> >  #include <dt-bindings/gpio/gpio.h>
> >  #include <dt-bindings/input/input.h>
> >  #include <dt-bindings/interrupt-controller/arm-gic.h>
> > @@ -375,7 +376,8 @@ iomuxc: pinctrl@...30000 {
> >  			};
> >
> >  			gpr: iomuxc-gpr@...40000 {
> > -				compatible = "fsl,imx8mp-iomuxc-gpr", "syscon";
> > +				compatible = "fsl,imx8mp-iomuxc-gpr",
> > +					     "fsl,imx6q-iomuxc-gpr", "syscon";
> >  				reg = <0x30340000 0x10000>;
> >  			};
> >
> > @@ -965,6 +967,17 @@ aips4: bus@...00000 {
> >  			#size-cells = <1>;
> >  			ranges;
> >
> > +			pcie_phy: pcie-phy@...00000 {
> > +				compatible = "fsl,imx8mp-pcie-phy";
> > +				reg = <0x32f00000 0x10000>;
> > +				resets = <&src IMX8MP_RESET_PCIEPHY>,
> > +					 <&src IMX8MP_RESET_PCIEPHY_PERST>;
> > +				reset-names = "pciephy", "perst";
> > +				power-domains = <&hsio_blk_ctrl
> IMX8MP_HSIOBLK_PD_PCIE_PHY>;
> > +				#phy-cells = <0>;
> > +				status = "disabled";
> > +			};
> > +
> >  			hsio_blk_ctrl: blk-ctrl@...10000 {
> >  				compatible = "fsl,imx8mp-hsio-blk-ctrl", "syscon";
> >  				reg = <0x32f10000 0x24>;
> > @@ -980,6 +993,37 @@ hsio_blk_ctrl: blk-ctrl@...10000 {
> >  			};
> >  		};
> >
> > +		pcie: pcie@...00000 {
> > +			compatible = "fsl,imx8mp-pcie";
> > +			reg = <0x33800000 0x400000>, <0x1ff00000 0x80000>;
> > +			reg-names = "dbi", "config";
> > +			#address-cells = <3>;
> > +			#size-cells = <2>;
> > +			device_type = "pci";
> > +			bus-range = <0x00 0xff>;
> > +			ranges =  <0x81000000 0 0x00000000 0x1ff80000 0
> 0x00010000 /* downstream I/O 64KB */
> > +				   0x82000000 0 0x18000000 0x18000000 0
> 0x07f00000>; /* non-prefetchable memory */
> > +			num-lanes = <1>;
> > +			num-viewport = <4>;
> > +			interrupts = <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>;
> > +			interrupt-names = "msi";
> > +			#interrupt-cells = <1>;
> > +			interrupt-map-mask = <0 0 0 0x7>;
> > +			interrupt-map = <0 0 0 1 &gic GIC_SPI 126
> IRQ_TYPE_LEVEL_HIGH>,
> > +					<0 0 0 2 &gic GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>,
> > +					<0 0 0 3 &gic GIC_SPI 124 IRQ_TYPE_LEVEL_HIGH>,
> > +					<0 0 0 4 &gic GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
> > +			fsl,max-link-speed = <3>;
> 
> I believe that imx6_pcie_start_link does not properly handle Gen3 speeds.
Good caught.
The according link_gen condition should be changed in driver too.
Would be changed in next version.
Thanks.

Best Regards
Richard Zhu
> 
> Regards,
> Lucas
> 
> > +			linux,pci-domain = <0>;
> > +			power-domains = <&hsio_blk_ctrl IMX8MP_HSIOBLK_PD_PCIE>;
> > +			resets = <&src IMX8MP_RESET_PCIE_CTRL_APPS_EN>,
> > +				 <&src IMX8MP_RESET_PCIE_CTRL_APPS_TURNOFF>;
> > +			reset-names = "apps", "turnoff";
> > +			phys = <&pcie_phy>;
> > +			phy-names = "pcie-phy";
> > +			status = "disabled";
> > +		};
> > +
> >  		gpu3d: gpu@...00000 {
> >  			compatible = "vivante,gc";
> >  			reg = <0x38000000 0x8000>;
>