[Intel-gfx] [PATCH] drm/i915: Check visibility in icl_build_plane_wm

[Maarten Lankhorst]

Op 17-06-2019 om 14:34 schreef Ville Syrjälä:
> On Fri, Jun 14, 2019 at 12:39:41PM +0200, Maarten Lankhorst wrote:
>> When a planar YUV plane is configured, but the crtc is
>> marked inactive, we can end up with a linked plane without
>> visibility.
> How is that possible? I don't think we should be adding the slave plane
> if the master is not visible.


DPMS off, we calculate the various fields as if the CRTC is on, then disable visibility.

crtc_state->nv12_planes etc still get set, so it works as if the crtc is on.

It's a way of not allowing an invalid result when dpms is off, then breaking on crtc enable.