USB on T1040rdb linux does not find external devices

[stevereynolds]

Hi

If I do usb start in u-boot before booting linux external devices are detected, but if I don't then they are not.

I suspect the power is not being turned on by Linux

Could you please tell me if there a patch for this or is the recommended workaround to start usb in u-boot?

Thanks

Steve

[yipingwang]

Hello steve reynolds,

I am not sure which version Linux SDK you are using, the attached u-boot patch from SDK 1.7 should related with this problem.

Please refer to the following code regarding erratum A007792 in Linux Kernel.

        /*

        * Enable UTMI phy and program PTS field in UTMI mode before asserting

        * controller reset for USB Controller version 2.5

        */

        if (pdata->has_fsl_erratum_a007792) {

                clrsetbits_be32(hcd->regs + FSL_SOC_USB_CTRL,

                                CONTROL_REGISTER_W1C_MASK, CTRL_UTMI_PHY_EN);

                writel(PORT_PTS_UTMI, hcd->regs + FSL_SOC_USB_PORTSC1);

        }

If your problem remains, please feel free to let me know.

Have a great day,
Yiping

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