[PATCH weston] compositor-drm: Don't page flip before a mode is set

[Rob Bradford]

On Tue, May 07, 2013 at 02:16:59PM +0300, Ander Conselvan de Oliveira wrote:
> The function drm_output_start_repaint_loop() unconditionally issues a
> page flip, even if the crtc for that output has not been enabled yet.
> That causes the page flip to fail, and drm_output_repaint() is never
> called.
> 
> Solve this by bypassing the initial page flip if the output needs a
> mode set.
> 
> This has the caveat of affecting latency predictability for that first
> frame and when a "driver" mode fullscreen surface causes a mode set.
> However, on both cases the mode set would take an unpredictable amount
> of time anyway.
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=63812
> https://bugs.freedesktop.org/show_bug.cgi?id=64183

Resolves all my problems.

Tested-by: Rob Bradford <robert.bradford at intel.com>

Rob