From: Mario Kleiner <mario.kleiner.de@gmail.com>
To: dri-devel@lists.freedesktop.org, airlied@gmail.com
Cc: intel-gfx@lists.freedesktop.org
Subject: Vblank timestamping improvements/fixes for Linux drm.
Date: Sat, 26 Oct 2013 10:27:38 +0200 [thread overview]
Message-ID: <1382776062-3770-1-git-send-email-mario.kleiner.de@gmail.com> (raw)
Hi all,
this patch set for the kernel pushes the latency sensitive bits of
vblank scanoutpos timestamping from the drm core into the kms drivers.
A change in the locking of the intel-kms driver for Linux 3.11 made
the old approach too inaccurate and also incompatible with the
PREEMPT_RT realtime kernel patch set. These patches fix that problem
and restore the old level of precision and reliability.
The patch set changes the prototype of driver->get_scanout_position()
to require/allow kms drivers to perform the ktime_get() system time
queries which go along with actual scanout position readout in a way
that provides maximum precision and to return those timestamps to
the drm. It also converts the only two kms drivers which use this api
so far (intel-kms and radeon-kms) to the new api and improves precision
and reliability of the intel-kms a lot.
Patches have been tested on Intel and AMD Radeon hardware and the Intel
bits have received some review and feedback by Ville Syrjälä.
Please review and apply if possible.
Thanks,
-mario
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next reply other threads:[~2013-10-26 8:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-26 8:27 Mario Kleiner [this message]
2013-10-26 8:27 ` [PATCH 1/4] drm: Remove preempt_disable() from vblank timestamping code Mario Kleiner
2013-10-26 8:27 ` [PATCH 2/4] drm: Push latency sensitive bits of vblank scanoutpos timestamping into kms drivers Mario Kleiner
2013-10-26 8:27 ` [PATCH 3/4] drm/radeon: Push get_scanout_position() timestamping into kms driver Mario Kleiner
2013-10-26 8:27 ` [PATCH 4/4] drm/intel: " Mario Kleiner
2013-10-28 11:08 ` Vblank timestamping improvements/fixes for Linux drm Ville Syrjälä
2013-10-28 15:54 ` Alex Deucher
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