Re: [Intel-gfx] drm/i915: WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock)

From: Paul Bolle
Date: Thu Oct 13 2016 - 14:07:02 EST

[Adding Matt]

On Wed, 2016-10-12 at 14:08 +0300, Joonas Lahtinen wrote:
> Bisecting the offending commit between v4.8 and v4.8.1 would be a good
> start.

0) Why use a personal notebook when one can just post any half baked
idea to lkml?

1) I stumbled onÂÂ;(s
ame hardware, rather similar trace).

2) That report was about the first Fedora (rawhide) kernel release
after this commitÂ
mmit/?h=f25&id=7d2c2f2d91793b5da452bee9bea4fa32051c8608Â("Bring in
patch-series from drm-next to fix skl_update_other_pipe_wm issues").

3) That seventeen part series ended up in v4.8. The last commit of that
series is commitÂ5b483747a925 ("drm/i915: Remove wm_config from

4) So, with a little bit of luck, my bisect might only need to look at
those seventeen commits. Still, it will probably be next week before I
have a day or two to actually perform that bisect.

To be continued,

Paul Bolle