[U-Boot] [YBA] mx28evk.h CONFIG_EHCI_MXS_PORT0 power?

[U-Boot] [YBA] mx28evk.h CONFIG_EHCI_MXS_PORT0 power?

[Jonathan Ben Avraham]

Dear colleagues,
When I configure mx28evk with CONFIG_EHCI_MXS_PORT0 instead of the 
default CONFIG_EHCI_MXS_PORT1, and run on an i.MX28 EVK PCB REV D, and 
do "start usb" at the prompt, then ehci_set_usbmode(0) (to set host 
mode) is called but there is no 5V output on the micro-usb connector and 
so the attached storage device is not detected.

When I use CONFIG_EHCI_MXS_PORT1 the storage device receives 5V and U-Boot 
detects it.

In Linux 3.13.9 with "dr_mode = host" in the usb0 DTS config, the 
micro-usb connector receives 5V and the storage device is detected, so I 
know that the hardware is configured correctly and works.

Where should I look to debug the power configuration for usb0?
TIA,

  - yba


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[U-Boot] [YBA] mx28evk.h CONFIG_EHCI_MXS_PORT0 power?

[Marek Vasut]

On Wednesday, June 25, 2014 at 07:14:24 PM, Jonathan Ben Avraham wrote:
> Dear colleagues,
> When I configure mx28evk with CONFIG_EHCI_MXS_PORT0 instead of the
> default CONFIG_EHCI_MXS_PORT1, and run on an i.MX28 EVK PCB REV D, and
> do "start usb" at the prompt, then ehci_set_usbmode(0) (to set host
> mode) is called but there is no 5V output on the micro-usb connector and
> so the attached storage device is not detected.
> 
> When I use CONFIG_EHCI_MXS_PORT1 the storage device receives 5V and U-Boot
> detects it.
> 
> In Linux 3.13.9 with "dr_mode = host" in the usb0 DTS config, the
> micro-usb connector receives 5V and the storage device is detected, so I
> know that the hardware is configured correctly and works.

You most likely need to toggle some GPIO to enable the power to the port. Check 
the schematics and check board/freescale/mx28evk/mx28evk.c for power toggling 
implementation, that's where the GPIO toggling goes.

Best regards,
Marek Vasut