From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Nazzareno Trimarchi <michael@amarulasolutions.com>
Date: Tue, 26 Mar 2019 09:21:26 +0100
Subject: [U-Boot] [PATCH] pico-imx7: Disable video support
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Hi

On Mon, Mar 25, 2019 at 11:12 PM Fabio Estevam <festevam@gmail.com> wrote:
>
> Hi Michael,
>
> On Mon, Mar 25, 2019 at 1:56 PM Fabio Estevam <festevam@gmail.com> wrote:
>
> > U-Boot 2019.04-rc4-00047-gcfb3e102c4 (Mar 23 2019 - 10:45:10 -0300)
> >
> > CPU:   Freescale i.MX7D rev1.2 1000 MHz (running at 792 MHz)
> > CPU:   Commercial temperature grade (0C to 95C) at 40C
> > Reset cause: POR
> > Board: i.MX7D PICOSOM
> > I2C:   ready
> > DRAM:  512 MiB
> >
> > (Hangs here)
>
> It seems this hangs is related to the GPIO that enables the LCD.
>
> If I change the code like this:
>
> diff --git a/board/technexion/pico-imx7d/pico-imx7d.c
> b/board/technexion/pico-imx7d/pico-imx7d.c
> index 767d13dfe5..ba1c6f9740 100644
> --- a/board/technexion/pico-imx7d/pico-imx7d.c
> +++ b/board/technexion/pico-imx7d/pico-imx7d.c
> @@ -294,7 +294,7 @@ void setup_lcd(void)
>         /* Set Brightness to high */
>         gpio_direction_output(IMX_GPIO_NR(1, 11) , 1);
>         /* Set LCD enable to high */
> -       gpio_direction_output(IMX_GPIO_NR(1, 6) , 1);
> +       gpio_direction_output(IMX_GPIO_NR(1, 6) , 0);
>  }
>  #endif
>
> Then I can load U-Boot via USB without problem.
>
> However, in order to turn on the LCD we need to turn on GPIO1_6.
>
> If I do this from the U-Boot prompt:
>
> => gpio set 6
>
> Then the board hangs.
>
> Not sure why setting GPIO1_6 is causing the board to hang.

Maybe you drain to much power ;)

Michael


-- 
| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
|                  [`as] http://www.amarulasolutions.com               |