[Intel-gfx] [PATCH 1/6] drm: Let userspace check if driver supports modeset

[Souza, Jose]

On Tue, 2018-07-17 at 08:28 +0100, Chris Wilson wrote:
> Quoting José Roberto de Souza (2018-07-16 23:38:36)
> > GPU accelerators usually don't have display block or the display
> > driver part can be disable when building driver(for servers it save
> > some resources) so it is important let userspace check this
> > capability too.
> 
> We currently communicate that by having no modeset resources. What
> does
> another cap bit accomplish that we don't already know?

This is a hackish way to check if driver support modeset,
drmModeGetResources()/drm_mode_getresources() can fail and return null
by other reasons and just check for the errno value can be misleading
too.

> -Chris