From: "Terje Bergström" <tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
To: Mario Kleiner <mario.kleiner-TdbV1Z3I5XE0NhjG498hmQ@public.gmane.org>
Cc: Jon Mayo <jon-MQ+mZzckBGs@public.gmane.org>,
Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>,
Thierry Reding
<thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>,
David Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org"
<dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>
Subject: Re: [PATCH v2 4/5] drm/tegra: Implement VBLANK support
Date: Wed, 23 Jan 2013 10:02:20 +0200 [thread overview]
Message-ID: <50FF990C.3040902@nvidia.com> (raw)
In-Reply-To: <50FEEF92.9060009-TdbV1Z3I5XE0NhjG498hmQ@public.gmane.org>
On 22.01.2013 21:59, Mario Kleiner wrote:
> The current swap scheduling is based on having an accurate software
> vblank counter. Atm. that counter is maintained in software, incremented
> during vblank irq. At irq off -> on transition we need a hw counter to
> reinitialize. And there is a timeout between dropping the last reference
> to a counter via drm_vblank_put() and actually disabling the vblank irq.
> If the timeout is long enough and a timing sensitive app is aware that
> vblank counters may be inaccurate/unreliable over long time periods, it
> can work around the problem.
We have a hardware counter that can be used as VBLANK counter - host1x
sync point register numbers 26 and 27. tegradrm already sets them up in
dc init (DC_CMD_CONT_SYNCPT_VSYNC). Basic syncpt support (read, wait) is
part of my patch set to implement 2D acceleration.
Terje
next prev parent reply other threads:[~2013-01-23 8:02 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-14 16:05 [PATCH v2 0/5] drm/tegra: Miscellaneous enhancements Thierry Reding
[not found] ` <1358179560-26799-1-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-01-14 16:05 ` [PATCH v2 1/5] drm: Allow vblank support without DRIVER_HAVE_IRQ Thierry Reding
2013-01-14 16:05 ` [PATCH v2 2/5] drm/tegra: Add plane support Thierry Reding
[not found] ` <1358179560-26799-3-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-01-14 17:03 ` Lucas Stach
2013-01-15 11:19 ` Thierry Reding
2013-01-15 9:53 ` Mark Zhang
[not found] ` <50F526FF.1010101-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-01-15 10:50 ` Lucas Stach
2013-01-18 3:59 ` Mark Zhang
2013-01-15 11:35 ` Ville Syrjälä
[not found] ` <20130115113532.GC3503-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-01-15 11:50 ` Thierry Reding
2013-01-14 16:05 ` [PATCH v2 3/5] drm/tegra: Implement .mode_set_base() Thierry Reding
[not found] ` <1358179560-26799-4-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-01-14 17:14 ` Lucas Stach
2013-01-17 6:10 ` Mark Zhang
2013-01-14 16:05 ` [PATCH v2 4/5] drm/tegra: Implement VBLANK support Thierry Reding
[not found] ` <1358179560-26799-5-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-01-22 17:37 ` Mario Kleiner
[not found] ` <50FECE63.7090009-TdbV1Z3I5XE0NhjG498hmQ@public.gmane.org>
2013-01-22 18:39 ` Lucas Stach
2013-01-22 18:49 ` Jon Mayo
[not found] ` <CADWT_cOjVg9-hB+jWuEUr+Ou-YECBN73WQXNy17qXf3TO1ZjpQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-01-22 19:59 ` Mario Kleiner
[not found] ` <50FEEF92.9060009-TdbV1Z3I5XE0NhjG498hmQ@public.gmane.org>
2013-01-23 8:02 ` Terje Bergström [this message]
[not found] ` <50FF990C.3040902-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-02-11 9:08 ` Thierry Reding
[not found] ` <20130211090840.GB3423-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2013-02-11 15:43 ` Terje Bergström
2013-01-22 19:20 ` Mario Kleiner
[not found] ` <50FEE681.7020208-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-01-22 19:27 ` Jon Mayo
[not found] ` <CADWT_cOpSBR+DiKwQ4PvYk8-o88Wf5=Tz+ho_g4MdUVKMtc-dw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-01-22 20:08 ` Mario Kleiner
2013-02-11 9:13 ` Thierry Reding
2013-02-15 22:38 ` Mario Kleiner
2013-01-14 16:06 ` [PATCH v2 5/5] drm/tegra: Implement page-flipping support Thierry Reding
[not found] ` <1358179560-26799-6-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-01-16 11:10 ` Mark Zhang
[not found] ` <50F68AB2.4030408-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-01-16 11:53 ` Lucas Stach
2013-01-17 4:49 ` Mark Zhang
2013-01-17 6:33 ` Mark Zhang
2013-01-22 8:31 ` Terje Bergström
[not found] ` <50FE4E4F.6080506-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-01-22 8:57 ` Thierry Reding
[not found] ` <20130122085756.GA6315-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2013-01-22 9:15 ` Lucas Stach
2013-01-22 9:31 ` Thierry Reding
[not found] ` <20130122093150.GA22264-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2013-01-22 9:44 ` Terje Bergström
[not found] ` <50FE5F61.4080103-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-01-22 9:48 ` Lucas Stach
2013-01-22 10:39 ` Terje Bergström
2013-01-22 9:35 ` Terje Bergström
2013-01-22 17:27 ` Mario Kleiner
[not found] ` <50FECBFC.8080307-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-02-11 9:00 ` Thierry Reding
[not found] ` <20130211090001.GA3423-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2013-02-15 22:34 ` Mario Kleiner
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