[yocto] [meta-raspberrypi][PATCH 5/5] rpi-default-providers: Switch providers according to used gfx stack

[Javier Martinez Canillas]

Hello Andreas,

On 08/12/2015 10:22 PM, Andreas Müller wrote:
> On Wed, Aug 12, 2015 at 7:15 PM, Andreas Müller
> <schnitzeltony at googlemail.com> wrote:
>> FYI: I managed to get the vc4 driver loaded (should be in my repo
>> branch vc4-2). With this I get some repeating kernel error messages
>> (don't have them here). I am sure that I read something about these
>> messages when preparing vc4 (yes I started similar before you sent
>> patches).
>>

Awesome, I tried to get it working yesterday but couldn't. Good work!

>> Hope I have some energy left tonight to check further and let you know...
>>
>>From xorg perspective all looks fine
> 
> [595923.730] (II) modeset(0): [DRI2] Setup complete
> [595923.730] (II) modeset(0): [DRI2]   DRI driver: vc4
> [595923.730] (II) modeset(0): [DRI2]   VDPAU driver: vc4
> [595923.740] (--) RandR disabled
> [595923.745] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
> [595923.745] (II) AIGLX: enabled GLX_ARB_create_context
> [595923.745] (II) AIGLX: enabled GLX_ARB_create_context_profile
> [595923.745] (II) AIGLX: enabled GLX_EXT_create_context_es2_profile
> [595923.745] (II) AIGLX: enabled GLX_INTEL_swap_event
> [595923.745] (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
> [595923.745] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
> [595923.745] (II) AIGLX: enabled GLX_ARB_fbconfig_float
> [595923.745] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
> [595923.747] (II) AIGLX: Loaded and initialized vc4
> [595923.747] (II) GLX: Initialized DRI2 GL provider for screen 0
> [595923.782] (II) modeset(0): Setting screen physical size to 338 x 270
> 
> but kernel complains periodically ~6s with
> 
> [   36.814922] [drm:vc4_submit_cl_ioctl] *ERROR* Rendering requires
> BOs to validate
> [   43.060516] [drm:vc4_submit_cl_ioctl] *ERROR* Rendering requires
> BOs to validate
> [   49.325115] [drm:vc4_submit_cl_ioctl] *ERROR* Rendering requires
> BOs to validate
> [   55.558433] [drm:vc4_submit_cl_ioctl] *ERROR* Rendering requires
> BOs to validate
>

Yes, I was able to reproduce the issue. My X -verbose output:

http://hastebin.com/onovosojuw.md

> Will check what this message want me to say - anybody out there with
> helping hints?
>

No clue. I was looking and the error is in the VC4_SUBMIT_CL ioctl cmd
handler (vc4_submit_cl_ioctl) in drivers/gpu/drm/vc4/vc4_gem.c.

AFAIU bo_handle_count is supposed to always be > 0 but somehow mesa is
passing 0 on it.

The ioctl call is in vc4_flush (src/gallium/drivers/vc4/vc4_context.c)
in mesa. So it seems this is a mesa issue. I've asked Eric Anholt in
#dri-devel on IRC if his kernel is supposed to work with mesa 10.5.8
or if there is a minimum version / sha1 that is needed.

> Andreas
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America