[Bug 79311] Call trace originating from i915 referencing intel_wait_for_vblank()

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=79311

--- Comment #25 from Alan Bartlett <ajb at elrepo.org> ---
(In reply to Ville Syrjala from comment #23)
> Created attachment 149301 [details]
> [PATCH] drm/i915: Wait for vblank after enabling the TV encoder
> 
> Here's another version that places the vblank wait after enabling the TV
> encoder. This would make some sense to me given the comments in the TV
> detect code. Please report back which one of the patches work (or if neither
> or both work).

Applying this patch to the linux-3.17-rc3 sources and building results in a
kernel that is bad.

[Duo2 ~] uname -r
3.17.0-0.rc3.149301.patch.el7.elrepo.x86_64
[Duo2 ~] dmesg | grep -Ei 'cut here|error|warning'
[    0.000000] ACPI BIOS Warning (bug): 32/64X length mismatch in
FADT/Gpe0Block: 128/64 (20140724/tbfadt-618)
[    0.560733] i8042: Warning: Keylock active
[   38.867040] ------------[ cut here ]------------
[   38.867096] WARNING: CPU: 0 PID: 1152 at
drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210
[i915]()
[   38.993037] ------------[ cut here ]------------
[   38.993094] WARNING: CPU: 0 PID: 1152 at
drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210
[i915]()
[   39.165040] ------------[ cut here ]------------
[   39.165097] WARNING: CPU: 0 PID: 1152 at
drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210
[i915]()
[   39.291040] ------------[ cut here ]------------
[   39.291096] WARNING: CPU: 0 PID: 1152 at
drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210
[i915]()
[Duo2 ~]

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