[U-Boot] usbkbd input double echoed

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 11/23/2014 04:07 PM, Nikita Kiryanov wrote:
> Hi all,
> 
> I've enabled USB keyboard for cm_fx6 using these three defines:
> 
> #define CONFIG_USB_KEYBOARD
> #define CONFIG_SYS_USB_EVENT_POLL
> #define CONFIG_SYS_STDIO_DEREGISTER
> 
> I am able to probe it with `usb start`, and set it as input using
> `setenv stdin usbkbd`.
> 
> It works, save for one problem: all key presses are echoed twice.
> The double echo happens both on serial and vga stdout.
> It is not dependant on the keyboard (tried different ones).
> Output from commands looks normal.
> Switching to CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP did not help.
> Shell still understands each key press as one key press, so
> even though "pprriinntteennvv" is displayed, the shell still sees
> "printenv".
> 
> Any idea what the cause may be?

In my experience both polling methods are sub-optimal, if your board
has an ehci controller, try using CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE

Also I use CONFIG_CONSOLE_MUX, then you can do:

setenv stdin serial,usbkbd

And get both, using this usb-kbd support works fine for me, without the
double echo, both on the serial console and on the sunxi-cfb console over
hdmi.

Regards,

Hans