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From: "Michel Dänzer" <michel@daenzer.net>
To: "Mario Kleiner" <mario.kleiner.de@gmail.com>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: "Daniel Vetter" <daniel.vetter@ffwll.ch>,
	LKML <linux-kernel@vger.kernel.org>,
	dri-devel@lists.freedesktop.org, mgraesslin@kde.org,
	kwin@kde.org, "Alex Deucher" <alexander.deucher@amd.com>,
	"Christian König" <christian.koenig@amd.com>
Subject: Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon
Date: Thu, 21 Jan 2016 12:43:10 +0900	[thread overview]
Message-ID: <56A053CE.7000500@daenzer.net> (raw)
In-Reply-To: <569FEEDE.4060409@gmail.com>

On 21.01.2016 05:32, Mario Kleiner wrote:
>
> So the problem is that AMDs hardware frame counters reset to
> zero during a modeset. The old DRM code dealt with drivers doing that by
> keeping vblank irqs enabled during modesets and incrementing vblank
> count by one during each vblank irq, i think that's what
> drm_vblank_pre_modeset() and drm_vblank_post_modeset() were meant for.

Right, looks like there's been a regression breaking this. I suspect the
problem is that vblank->last isn't getting updated from
drm_vblank_post_modeset. Not sure which change broke that though, or how
to fix it. Ville?


BTW, I'm seeing a similar issue with drm_vblank_on/off as well, which
exposed the bug fixed by 209e4dbc ("drm/vblank: Use u32 consistently for
vblank counters"). I've been meaning to track that down since then; one
of these days hopefully, but if anybody has any ideas offhand...


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
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  reply	other threads:[~2016-01-21  3:43 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-15 10:34 linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon Vlastimil Babka
2016-01-15 12:26 ` Ville Syrjälä
2016-01-15 12:40   ` Vlastimil Babka
2016-01-16  4:24   ` Mario Kleiner
2016-01-18 10:49     ` Vlastimil Babka
2016-01-18 14:06       ` Vlastimil Babka
2016-01-18 14:14         ` Christian König
2016-01-20 20:25       ` Vlastimil Babka
2016-01-20 20:32       ` Mario Kleiner
2016-01-21  3:43         ` Michel Dänzer [this message]
2016-01-21  5:31           ` Mario Kleiner
2016-01-21  6:38             ` Michel Dänzer
2016-01-21  6:41               ` Michel Dänzer
2016-01-21  7:58                 ` Daniel Vetter
2016-01-21  8:36                   ` Michel Dänzer
2016-01-21 10:09                     ` Daniel Vetter
2016-01-22  3:06                       ` Michel Dänzer
2016-01-22 15:18                         ` Ville Syrjälä
2016-01-22 18:29                           ` Mario Kleiner
2016-01-23 18:23                             ` Mario Kleiner
2016-01-25  4:15                           ` Michel Dänzer
2016-01-25 13:16                             ` Mario Kleiner
2016-01-25 13:23                               ` Ville Syrjälä
2016-01-25 13:44                                 ` Mario Kleiner
2016-01-25 14:53                                   ` Ville Syrjälä
2016-01-25 16:38                                     ` Mario Kleiner
2016-01-25 18:51                                       ` Daniel Vetter
2016-01-25 19:30                                         ` Mario Kleiner
2016-01-25 20:32                                           ` Daniel Vetter
2016-01-25 21:42                                             ` Mario Kleiner
2016-01-25 22:05                                               ` Daniel Vetter
2016-01-21  8:28               ` Mario Kleiner
2016-01-21  9:15                 ` Vlastimil Babka

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