Problem with first use of DRM using planes. Sama5d3

[Alex Vazquez <avazquez.dev@xxxxxxxxx>]

Hi All!

I have a sama5d3 Explained with 4.3" LCD (TM4301).

My problem is the next: 

After booting the system and try to draw first using DRM using planes don't paint anything on the LCD displays, but from the second time is painted correctly on the LCD.

I have seen a couple of things:

- After starting / sys/class/drm/card0/card0-LVDS-1/enabled is disabled

After running the program for the first time or paint something using the framebuffer, the state becomes enabled and can be drawn correctly using planes.

- If I don't use planes and use CRTC  it works correctly.

- If I open the device with drmOpen() it works correctly. (works because this function calls drmAvailable(). I tried to modify the code libdrm and if we comment drmAvailable() does not work modetest using planes.)

Attached two codes: In the first I do not use drmAvailable() and the second use drmAvailable().

I don't want to use drmOpen() because you have to indicate the driver and want to do it generically using the function open().

I tried to enable drm from kernel_mode_setting (video=LVDS-1:480x272-16:e) but don't work.

I am almost certain that the first time does not paint because DRM is disabled and using planes seems not enabled properly until the sample application is closed. Viewing code of drmAvailable() I can see that opens and closes the device with what happens to an enabled state.

I'm not sure if it's a bug in the driver or libdrm or is my mistake...

Code:

http://pastebin.com/2jKvhFWD

http://pastebin.com/4aWi5e2X

Thanks!

Regards!

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