xf86-video-armada via UDL [was: Re: UDL's fbdev doesn't work for user-space apps]

[Alexey Brodkin]

Hi Jose,

On Tue, 2017-12-05 at 12:26 +0000, Jose Abreu wrote:
> On 05-12-2017 11:53, Alexey Brodkin wrote:
> > 
> > 
> > From my note above about udl_drm_gem_mmap() being only used in case of Xserver
> > I barely may conclude anything. Given my lack of knowledge of DRM guts
> > especially
> > when it comes to complicated cases with DMA buffer exports/imports I cannot say
> > immediately if that's just improper implementation of
> > udl_drm_gem_mmap() or not.
> > Even though I do see some differences between implementation of file_operations->mmap()
> > callback in UDL and
> > say exynos_drm_gem_mmap() or qxl_mmap() it's not clear
> > why this and that implementation was done.
> 
> Oh, I've seen this before. This is the same thing that arcpgu
> used to do in the mmap callback! Please comment out the call to
> update_vm_cache_attr() in the mmap callback and check if it works.

Actually I did it as the first thing when I spotted it in udl_drm_gem_mmap().
But that made no difference at all :(

-Alexey