linux-kernel - Re: [PATCH V3 7/7] arm64: dts: imx8mp: add interconnect for hsio blk ctrl

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Message-Id: <20230327045037.593326-1-gerg@linux-m68k.org>
Date:   Mon, 27 Mar 2023 14:50:37 +1000
From:   Greg Ungerer <gerg@...ux-m68k.org>
To:     peng.fan@....nxp.com
Cc:     Markus.Niebel@...tq-group.com, abailon@...libre.com,
        abelvesa@...nel.org, aford173@...il.com,
        devicetree@...r.kernel.org, djakov@...nel.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, linux-imx@....com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        marex@...x.de, paul.elder@...asonboard.com, peng.fan@....com,
        robh+dt@...nel.org, s.hauer@...gutronix.de, shawnguo@...nel.org,
        gerg@...nel.org
Subject: Re: [PATCH V3 7/7] arm64: dts: imx8mp: add interconnect for hsio blk ctrl

On 2/3/22 17:13, Peng Fan wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Add interconnect property for hsio blk ctrl
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
 > arch/arm64/boot/dts/freescale/imx8mp.dtsi | 5 +++++
 > 1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> index 08bd57742294..9cceeeeb26be 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1109,6 +1109,11 @@ hsio_blk_ctrl: blk-ctrl@...10000 {
>  						<&pgc_hsiomix>, <&pgc_pcie_phy>;
>  				power-domain-names = "bus", "usb", "usb-phy1",
>  						     "usb-phy2", "pcie", "pcie-phy";
> +				interconnects = <&noc IMX8MP_ICM_NOC_PCIE &noc IMX8MP_ICN_HSIO>,
> +						<&noc IMX8MP_ICM_USB1 &noc IMX8MP_ICN_HSIO>,
> +						<&noc IMX8MP_ICM_USB2 &noc IMX8MP_ICN_HSIO>,
> +						<&noc IMX8MP_ICM_PCIE &noc IMX8MP_ICN_HSIO>;
> +				interconnect-names = "noc-pcie", "usb1", "usb2", "pcie";
>  				#power-domain-cells = <1>;
>  			};
>  		};

This change completely breaks USB for me on a new iMX8mp platform I am
working with. Before this change normal USB probe looks good:

    xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
    xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1
    xhci-hcd xhci-hcd.0.auto: hcc params 0x0220fe6d hci version 0x110 quirks 0x0000000000010010
    xhci-hcd xhci-hcd.0.auto: irq 206, io mem 0x38100000
    xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
    xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2
    xhci-hcd xhci-hcd.0.auto: Host supports USB 3.0 SuperSpeed
    usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.03
    usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
    usb usb1: Product: xHCI Host Controller
    usb usb1: Manufacturer: Linux 6.3.0-rc4-dirty xhci-hcd
    ....

But after this commit is applied, no USB probe messages at all.

USB worked fine in 6.0 for me, but when I switched up to 6.1 USB was broken,
I bisected to this as being the offending commit. This is still broken for me
in todays 6.3-rc4. If I revert this change (and only this change) USB works
again.

Any thoughts on why this breaks USB?

Regards
greg