[Bug 109267] [GLK DSI] Display not working with i915 driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109267

--- Comment #62 from Mark Wynn Garcia <markwynngarcia at outlook.com> ---
Created attachment 144151
  --> https://bugs.freedesktop.org/attachment.cgi?id=144151&action=edit
dmesg-max-cdclk

So I tried something, which is to modify the patch and max the cdclk to 316800.
It actually completely removed all flicker/modesetting that happens when
starting X11. It also reduced flickering to just once instance in between grub
and boot.

Right now I really want to know what will happen if we can remove that modeset
on boot, that maybe at least we will preserve working states even if there is
still a bug in i915's initialization routines for GLK. In the attached dmesg, I
think these are what's triggering the modeset:

[    4.941737] [drm:pipe_config_err [i915]] mismatch in
base.adjusted_mode.crtc_vtotal (expected 1334, found 1335)
[    4.941786] [drm:pipe_config_err [i915]] mismatch in
base.adjusted_mode.crtc_vblank_end (expected 1334, found 1335)
[    4.941834] [drm:pipe_config_err [i915]] mismatch in dsi_pll.ctrl (expected
0x00000132, found 0x00000532)

I'll try hacking around this one, and if you any ideas, if you think this is a
good direction to pursue, please let me know.

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