[U-Boot] [PATCH v2 1/3] ARM: Tegra: FDT: Add USB EHCI function for T30/T114

Thierry Reding
2013-06-15T21:25:34Z

On Fri, Jun 14, 2013 at 06:41:40PM +0800, Jim Lin wrote:
[...]
> diff --git a/board/nvidia/dts/tegra30-beaver.dts b/board/nvidia/dts/tegra30-beaver.dts
[...]
> @@ -68,4 +69,9 @@
> status = "okay";
> bus-width = <8>;
> };
> +
> + usb at 7d008000 {
> + nvidia,vbus-gpio = <&gpio 61 3>; /* PH5, USB13_VBUS_PULLUP */

This doesn't work for me on Beaver. I need to turn the above line into
this:

nvidia,vbus-gpio = <&gpio 236 0>; /* PDD4 */

PDD4 is the correct GPIO according to the schematics and the pin is
high-active. Also as far as I can tell, 3 is not a meaningful value for
the U-Boot GPIO bindings. Only the value 1 (low-active) is used.

With that change applied on top of your patches I can see that a USB
flash drive connected to USB3 is indeed powered. However I noticed
something strange. When I try to use USB, I get this:

Tegra30 (Beaver) # usb start
(Re)start USB...
USB0: set_host_mode: GPIO 236 high
USB EHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
scanning usb for ethernet devices... 0 Ethernet Device(s) found

So no storage device is detected, even though a USB flash drive is
connected and powered properly. If I repeat the same command, however,
the storage device is detected:

Tegra30 (Beaver) # usb reset
(Re)start USB...
USB0: set_host_mode: GPIO 236 high
USB EHCI 1.00
scanning bus 0 for devices... 2 USB Device(s) found
scanning usb for storage devices... 1 Storage Device(s) found
scanning usb for ethernet devices... 0 Ethernet Device(s) found

Any idea what might be going on here?

Thierry
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