Re: Testing VC4 on rpi2 with wayland and weston, weston fail to start with drm

Eric Anholt <[email protected]> Fri, 02 Oct 2015 15:50:02 -0700

Newsgroups	gmane.comp.video.mesa3d.user
Message-ID	<[email protected]>

Fabio Fantoni <[email protected]> writes:

> Hi, I want try VC4 on rpi2 with wayland on debian (I used Sid).
> Following this howto:
> http://dri.freedesktop.org/wiki/VC4/
> I rebuild the kernel from 
> https://github.com/anholt/linux/tree/vc4-kms-v3d-rpi2
> Base config modified with: CONFIG_DRM_VC4=y and 
> CONFIG_CMA_SIZE_MBYTES=128, full .config in attachment.
> I did the 2 additions to rpi2 config.txt (full in attachment).
> New kernel is working, in kern.log about drm I saw only this about drm:
> Oct  1 11:11:16 jessie-rpi kernel: [    1.577017] [drm] Initialized drm 
> 1.1.0 20060810
> I suppose that compiling with CONFIG_DRM_VC4=y should be present but I 
> not saw line about.

You should also have various lines in dmesg about:

[    3.185410] vc4-drm soc:vc4@7e4c0000: bound 20902000.hdmi (ops vc4_hdmi_ops)
[    3.200606] vc4-drm soc:vc4@7e4c0000: bound 20206000.pixelvalve (ops vc4_crtc_ops)
[    3.220583] vc4-drm soc:vc4@7e4c0000: bound 20207000.pixelvalve (ops vc4_crtc_ops)
[    3.232884] vc4-drm soc:vc4@7e4c0000: bound 20807000.pixelvalve (ops vc4_crtc_ops)
[    3.250938] vc4-drm soc:vc4@7e4c0000: bound 20400000.hvs (ops vc4_hvs_ops)
[    3.263385] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    3.270162] [drm] No driver support for vblank timestamp query.
[    3.470743] Console: switching to colour frame buffer device 240x67
[    3.540179] vc4-drm soc:vc4@7e4c0000: fb0:  frame buffer device

so something is going wrong and keeping you from probing.  There's at
least one problem in your config -- you can't have

CONFIG_FB_BCM2708=y

since you're trying to run a proper graphics driver, instead.  I don't
think that would keep vc4 from probing, though.  Maybe you wouldn't have
hit any of those "bound" messages because HDMI fails first due to your
config being missing:

CONFIG_I2C_BCM2835=y

I've added that to the wiki page.

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