From: Daniel Vetter <daniel@ffwll.ch>
To: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
intel-gfx@lists.freedesktop.org,
Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Subject: Re: [PATCH 2/3] drm/i915: Fix scanoutpos calculations
Date: Sat, 12 Oct 2013 01:19:04 +0200 [thread overview]
Message-ID: <20131011231904.GO8303@phenom.ffwll.local> (raw)
In-Reply-To: <52580BCA.6080409@gmail.com>
On Fri, Oct 11, 2013 at 04:31:38PM +0200, Mario Kleiner wrote:
> Daniel, Ville,
>
> i tested Ville's patch series for the scanoutpos improvements on a
> GMA-950, on top of airlied's current drm-next branch.
>
> There's one issue: The variable "position" in
> i915_get_crtc_scanoutpos() must be turned from a u32 into a int,
> otherwise funny sign errors happen and we end up with *vpos being
> off by multiple million scanlines and timestamps being off by over
> 60 seconds.
>
> Other than that looks good. Execution time is now better:
>
> Before uncore.lock addition: 3-4 usecs execution time for the
> scanoutpos query on my machine. After uncore.lock addition
> (3.12.0-rc3) 9-20 usecs, sometimes repetition of the timing loop
> triggered. After Ville's patches down to typically 3-8 usecs,
> occassionally spiking to almost 20 usecs.
>
> I'll make my patches for the realtime kernel + increased accuracy on
> top of drm-next + Ville's patches.
So official reviewed-by/tested-by from you on Ville's latest patches in
this thread?
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2013-10-11 23:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-23 10:02 [PATCH 0/3] drm/i915: i915_get_crtc_scanoutpos improvements ville.syrjala
2013-09-23 10:02 ` [PATCH 1/3] drm/i915: Skip register reads in i915_get_crtc_scanoutpos() ville.syrjala
2013-09-23 10:30 ` Chris Wilson
2013-09-23 11:48 ` [PATCH v2 " ville.syrjala
2013-09-24 9:11 ` Daniel Vetter
2013-09-25 4:45 ` Mario Kleiner
2013-09-25 7:52 ` Daniel Vetter
2013-09-25 2:35 ` Mario Kleiner
2013-09-25 8:14 ` Ville Syrjälä
2013-09-26 16:12 ` Mario Kleiner
2013-09-23 10:02 ` [PATCH 2/3] drm/i915: Fix scanoutpos calculations ville.syrjala
2013-09-25 2:39 ` Mario Kleiner
2013-10-11 14:31 ` Mario Kleiner
2013-10-11 16:10 ` [PATCH v2 " ville.syrjala
2013-10-11 23:19 ` Daniel Vetter [this message]
2013-10-11 23:22 ` [PATCH " Mario Kleiner
2013-10-14 15:13 ` Daniel Vetter
2013-09-23 10:02 ` [PATCH 3/3] drm/i915: Improve the accuracy of get_scanout_pos on CTG+ ville.syrjala
2013-09-25 3:12 ` Mario Kleiner
2013-09-25 8:11 ` Ville Syrjälä
2013-09-25 8:46 ` Daniel Vetter
2013-09-26 17:04 ` Mario Kleiner
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