[Bug 95392] Trying to set mode 3840x2160 at 60 Hz results in a crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95392

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|intel-gfx-bugs at lists.freede |ville.syrjala at linux.intel.c
                   |sktop.org                   |om
             Status|NEEDINFO                    |ASSIGNED

--- Comment #8 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Oli from comment #7)
> (In reply to Ville Syrjala from comment #3)
> > [   12.914535] [drm:intel_update_cdclk] Current CD clock rate: 450000 kHz
> > [   91.861529] [drm:intel_dump_crtc_timings] crtc timings: 533280 3840 3848
> > 3992 4000 2160 2214 2219 2222, type: 0x0 flags: 0x9
> > 
> > Your cdclk is too low for that mode. I have a branch which has the required
> > bits to adjust cdclk dynamically on SKL:
> > git://github.com/vsyrjala/linux.git skl_bxt_cdclk_part_2
> > 
> > Can you test with that branch?
> 
> I did and it seems to works, at least the display didn't blank and xrandr
> reports 60 Hz. Though, I have no way to tell if this is really the case,
> because my display won't show this information.
> 
> See the attached dmesg output for more information. I used the same
> drm.debug settings as before.


[    9.195675] [drm:intel_update_cdclk] Current CD clock rate: 450000 kHz, VCO:
8100000 kHz, ref: 24000 kHz
[    9.195677] [drm:intel_update_max_cdclk] Max CD clock rate: 675000 kHz
[    9.195678] [drm:intel_update_max_cdclk] Max dotclock rate: 675000 kHz
[   70.790172] [drm:intel_dump_crtc_timings] crtc timings: 533280 3840 3848
3992 4000 2160 2214 2219 2222, type: 0x0 flags: 0x9
[   70.790188] [drm:intel_modeset_checks] New cdclk calculated to be atomic
540000, actual 540000
[   71.866294] [drm:skl_set_cdclk] Changing CDCLK to 540000 kHz (VCO 8100000
kHz)
[   71.872408] [drm:intel_update_cdclk] Current CD clock rate: 540000 kHz, VCO:
8100000 kHz, ref: 24000 kHz

So everything is looking good.

> 
> PS: Is this fix going upstream some time?

It's being reviewed now, so should land soonish, I hope.

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