[Mesa-dev] VC4 not working for me with mesa 17.3.7 - was [meta-raspberrypi] VC4 not working for me with mesa 17.3.7

[Andreas Müller]

On Mon, Apr 2, 2018 at 3:05 PM, Andreas Müller <schnitzeltony at gmail.com> wrote:
> On Mon, Apr 2, 2018 at 2:42 PM, Daniel Stone <daniel at fooishbar.org> wrote:
>> Hi Andreas,
>>
>> On 31 March 2018 at 15:18, Andreas Müller <schnitzeltony at gmail.com> wrote:
>>> Thanks for prompt an VERY helpful support. I did:
>>>
>>> * Check my configure and found: --disable-dri3!
>>> * Tested your patch (with --disable-dri3) and as expected it fixes the issue
>>> * Found what causes --disable-dri3 - it came in by the Openembedded
>>> update mentioned in first email. FWIW: I use a fork for
>>> meta-raspberrypi - the original is not affected so I am the only one
>>> with this issue...
>>
>> Glad to hear it!
>>
>>> I have two questions related to dri2/your patch (sorry asking for more :)
>>>
>>> 1. Your patch fixes improper initialized variable. Do you think it is
>>> worth being applied?
>>
>> Yes, definitely: I've sent it in now. It's sadly missed 17.3.8
>> (scheduled to be released about an hour ago), but hopefully we can get
>> it in for a 17.3.9, if we have one. Else it'll be in 18.0.1.
>>
>>> 2. In the thread I mentioned in my first email Trevor mentioned that
>>> he has seen error message 'Modifier 0x0 vs. tiling(0x7000000000000001)
>>> mismatch' when trying to get chromium GLES accelerated. Maybe a stupid
>>> question but is it possible that applications running at X can ask for
>>> dri2 explicitly?
>>
>> He said that only happened when using the system (rather than bundled)
>> libraries, which would presumably be using DRI2 by default. I've
>> submitted a bug to OE to ask them to enable DRI3 by default, but in
>> the meantime this Mesa fix should hopefully work anyway.
> Thanks - I was thinking same. OE-Core enables DRI3 for x11 AND vulcan
> only - and vulcan is not in my distro features (and does not make much
> sense for VC4)
>
> Added yocto mailing list to merge both threads together and avoid cross-tak.
>
> Thanks again for taking care
>
Hi Daniel,

Just sent out patches to oe-core

* Apply your patch with dri2 modifier init
* Prefer dri3 over dri2 for x11/opengl distro features

See what happens...

Cheers

Andreas