Re: using cdns3-imx driver on imx8qm

[Oliver Graute <oliver.graute@kococonnector.com>]

On 31/03/20, Peter Chen wrote:
>   
> > > 		compatible = "fsl,imx8qxp-lpcg";
> > > 		reg = <0x5b280000 0x10000>;
> > > 		#clock-cells = <1>;
> > > 		bit-offset = <0 4 16 20 24 28>;
> > > 		clocks = <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_PER>,
> > > 			 <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MISC>,
> > > 			 <&conn_ipg_clk>,
> > > 			 <&conn_ipg_clk>,
> > > 			 <&conn_ipg_clk>,
> > > 			 <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MST_BUS>;
> > > 		clock-output-names = "usb3_app_clk",
> > > 				     "usb3_lpm_clk",
> > > 				     "usb3_ipg_clk",
> > > 				     "usb3_core_pclk",
> > > 				     "usb3_phy_clk",
> > > 				     "usb3_aclk";
> > > 		power-domains = <&pd IMX_SC_R_USB_2_PHY>;
> > > 	};
> > >
> > > 	usbotg3: usb3@5b110000 {
> > > 		compatible = "fsl,imx8qm-usb3";
> > > 		#address-cells = <1>;
> > > 		#size-cells = <1>;
> > > 		ranges;
> > > 		reg = <0x5B110000 0x10000>;
> > > 		clocks = <&usb3_lpcg 1>,
> > > 			 <&usb3_lpcg 0>,
> > > 			 <&usb3_lpcg 5>,
> > > 			 <&usb3_lpcg 2>,
> > > 			 <&usb3_lpcg 3>;
> > > 		clock-names = "usb3_lpm_clk", "usb3_bus_clk", "usb3_aclk",
> > > 			"usb3_ipg_clk", "usb3_core_pclk";
> > > 		assigned-clocks = <&clk IMX_SC_R_USB_2
> > IMX_SC_PM_CLK_PER>,
> > > 			<&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MISC>,
> > > 			<&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MST_BUS>;
> > > 		assigned-clock-rates = <125000000>, <12000000>, <250000000>;
> > > 		power-domains = <&pd IMX_SC_R_USB_2>;
> > > 		status = "disabled";
> > >
> > > 		usbotg3_cdns3: cdns3 {
> > > 			compatible = "cdns,usb3";
> > > 			#address-cells = <1>;
> > > 			#size-cells = <1>;
> > > 			interrupt-parent = <&gic>;
> > > 			interrupts = <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
> > > 					<GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
> > > 					<GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>;
> > > 			interrupt-names = "host", "peripheral", "otg";
> > > 			reg = <0x5B130000 0x10000>,     /* memory area for HOST
> > registers */
> > > 				<0x5B140000 0x10000>,   /* memory area for
> > DEVICE registers */
> > > 				<0x5B120000 0x10000>;   /* memory area for
> > OTG/DRD registers */
> > > 			reg-names = "xhci", "dev", "otg";
> > > 			phys = <&usb3_phy>;
> > > 			phy-names = "cdns3,usb3-phy";
> > > 			status = "disabled";
> > > 		};
> > > 	};
> > 
> > Hello Peter,
> > 
> > thx for the dts example. Now I get "wait clkvld timeout" in "cdns_imx_noncore_init()"
> > So USB3_SSPHY_STATUS register seems to be wrong.
> > 
> > dmesg | grep imx
> > [    1.065445] cdns3-imx 5b110000.usb3: Adding to iommu group 0
> > [    1.257309] imx-scu scu: NXP i.MX SCU Initialized
> > [    1.275489] imx-scu-clk: probe of gpt0_clk failed with error -5
> > [    1.291143] imx-scu-clk: probe of pwm_clk failed with error -22
> > [    1.302517] imx-scu-clk: probe of lcd_clk failed with error -22
> > [    1.341405] imx8qm-pinctrl scu:pinctrl: initialized IMX pinctrl driver
> > [    3.029484] cdns3-imx 5b110000.usb3: wait clkvld timeout
> > [    3.034891] cdns3-imx: probe of 5b110000.usb3 failed with error -110
> > [    3.237393] sdhci-esdhc-imx 5b030000.mmc: Got CD GPIO
> > [    3.242468] sdhci-esdhc-imx 5b030000.mmc: Got WP GPIO
> > [    3.316687] imx8qxp-lpcg-clk 5a4a0000.clock-controller: ignoring dependency for
> > device, assuming no driver
> > 
>  
> Make sure the five clocks in dts are correct, and print the USB3_SSPHY_STATUS if
> timeout still exists.

ok thx, we got it fixed by replacing:

 clocks = <&usb3_lpcg 1>,
          <&usb3_lpcg 0>,
          <&usb3_lpcg 4>,
          <&usb3_lpcg 2>,
          <&usb3_lpcg 3>;

with this:
 
 clocks = <&usb3_lpcg IMX_LPCG_CLK_1>,
          <&usb3_lpcg IMX_LPCG_CLK_0>,
          <&usb3_lpcg IMX_LPCG_CLK_7>,
          <&usb3_lpcg IMX_LPCG_CLK_4>,
          <&usb3_lpcg IMX_LPCG_CLK_5>;

now the "wait clkvld timeout" is gone and the USB3_SSPHY_STATUS register
is very similar to another imx8qm device which runs linux-imx from NXP.

Now I try to get into USB HOST mode:

--- a/drivers/usb/cdns3/cdns3-imx.c
+++ b/drivers/usb/cdns3/cdns3-imx.c
@@ -113,11 +115,11 @@ static int cdns_imx_noncore_init(struct cdns_imx *data)
        udelay(1);

        value = cdns_imx_readl(data, USB3_CORE_CTRL1);
-       value = (value & ~MODE_STRAP_MASK) | OTG_MODE | OC_DISABLE;
+       value = (value & ~MODE_STRAP_MASK) | HOST_MODE | OC_DISABLE;
        cdns_imx_writel(data, USB3_CORE_CTRL1, value);

Is this change necessary?

Do I need special changes on xhci.c do get it work with cdns-imx in host mode?

I'am stuck at:

[   16.697525] xhci-hcd xhci-hcd.0.auto: can't setup: -110

I already tried to add the Intel quirk:

udelay(1000) in xhci_reset() but without success.

Is the host mode working on your side?

Best regards,

Oliver