[PATCH 1/2] drm/radeon: Only enable and handle pageflip interrupts when needed

[Michel Dänzer]

On 27.06.2014 09:53, Dieter Nützel wrote:
> Am 26.06.2014 12:39, schrieb Christian König:
>> Am 26.06.2014 11:29, schrieb Michel Dänzer:
>>> From: Michel Dänzer <michel.daenzer at amd.com>
>>>
>>> Prevents radeon_crtc_handle_flip() from running before
>>> radeon_flip_work_func(), resulting in a kernel panic due to the BUG_ON()
>>> in drm_vblank_put().
>>>
>>> Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de>
>>> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
>>
>> Does patch #2 alone fixes the problem as well?
> 
> With #2 alone I get this during boot up (before plymouth):

[...]

> [   15.259867] [drm:radeon_crtc_handle_flip] *ERROR*
> radeon_crtc->flip_status = 0 != RADEON_FLIP_SUBMITTED(2)

That's the original patch I sent to you along with two others for
testing. The patch I submitted in this series has these messages
downgraded to debugging messages, as they just show the patch preventing
bad stuff from happening as designed.

The question is, can you reproduce the panic or the 'impossible msc'
lines in the Xorg log with only patch #2?


> But with Michel's #1+2 and 3 I got this in Xorg.0.log:
> (See Xorg.0.log.old.xz)
> 
> (EE) [mi] EQ overflowing.  Additional events will be discarded until
> existing events are processed.

That may not be directly related to the page flipping issues.


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer