[Intel-gfx] [PATCH] drm/i915: Increase max texture to 16k for gen9+

[Chris Wilson]

Quoting Alex Tu (2017-12-07 09:26:00)
> Rrefer to another patch [1] on mesa to extend width/height to 16384.
> For issue :
>  - https://bugs.freedesktop.org/show_bug.cgi?id=102508
>  - LP: #1714178 Triple monitor display failed with Dell Dock (HiDPI)
> 
> [1] https://patchwork.freedesktop.org/patch/124918/
> 
> Signed-off-by: Alex Tu <alex.tu at canonical.com>

For -intel, I just used RandR to split the fb into per-crtc-pixmaps.
However, Kristian has suggested another approach where we carve
per-crtc-pixmaps/-fb out of the global frontbuffer, which allows us to
completely get around the stride limits of scanout and have no
synchronisation penalty. We still have to create new per-crtc-fb for a
flip, just like with RandR but we can avoid the extra blit.

How one feeds such details through gbm into -modesetting, I have no
idea.
-Chris