Help configuring i.MX6 IPUv3 with a parrallel display

[Sascha Hauer]

On Wed, Feb 24, 2016 at 09:22:40AM +0100, Philippe Leduc wrote:
> Hi,
> 
> Since I do not manage to get a splashscreen with the simple-panel
> driver, I tried the other way: adding a driver for
> imx-parrallel-display that exposes the display-timings. So far I
> managed to add a video mode to my framebuffer:
> 
> devinfo fb0
> Resources:
>   num: 0
>   start: 0x2005a000
>   size: 0x0007f800
> Available modes:
>   rk043fn07h: 480x272 at 0
> Parameters:
>   enable: 0
>   mode_name: rk043fn07h
>   shadowfb: 1
> 
> But there is no refresh rate? Don't know if it is a problem, but my
> framebuffer still doesn't want to work (however it is more or less
> better than before):

The refresh rate is 0 because the code in of_display_timing.c doesn't
set the refresh rate. That's not nice, but shouldn't be a problem.

> 
> fb0.enable=1
> imx-ipuv3-crtc imx-ipuv3-crtc0: ipu_crtc_mode_set: mode->xres: 480
> imx-ipuv3-crtc imx-ipuv3-crtc0: ipu_crtc_mode_set: mode->yres: 272
> imx-ipuv3-crtc imx-ipuv3-crtc0: initializing display controller failed with -22

The only way ipu_dc_init_sync() fails is when interface_pix_fmt is
invalid. This means you either have no "interface-pix-fmt" property or
this property doesn't get evaluated. You could try setting it to
V4L2_PIX_FMT_RGB24 manually in ipu_crtc_mode_set().

Sascha


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