From: Damien Lespiau <damien.lespiau@intel.com>
To: "Jindal, Sonika" <sonika.jindal@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/i915/skl: Support for 90/270 rotation
Date: Mon, 13 Apr 2015 12:10:14 +0100 [thread overview]
Message-ID: <20150413111014.GA23484@strange.ger.corp.intel.com> (raw)
In-Reply-To: <552B991A.7060403@intel.com>
On Mon, Apr 13, 2015 at 03:53:22PM +0530, Jindal, Sonika wrote:
> >>I never really got the to understand the need of reversing 90 and 270 :)
> >>The last discussion was not concluded, AFAIR.
> >>Things look correct to me and work fine with the testcase also.
> >>Is there something completely different which I am unable to get?
> >
> >BSpec gives me the impression the hw rotation is cw, whereas the drm one
> >is ccw.
> >
> Yes, HW rotation is cw as per bspec. In drm, where do we consider it as
> anti-cw? I assume it is cw because all the macros work as expected, ie cw.
The DRM is quite a direct implementation of the X semantics:
http://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt
"In Randr, the coordinate system is rotated in a counter-clockwise direction
relative to the normal orientation"
This matches the usual orientation of the trigonometric circle.
--
Damien
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next prev parent reply other threads:[~2015-04-13 11:10 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-10 9:07 [PATCH 1/2] drm/i915/skl: Allow universal planes to position Sonika Jindal
2015-04-10 9:07 ` [PATCH 2/2] drm/i915/skl: Support for 90/270 rotation Sonika Jindal
2015-04-10 14:17 ` Daniel Vetter
2015-04-10 14:44 ` Ville Syrjälä
2015-04-13 4:06 ` Jindal, Sonika
2015-04-13 10:10 ` Ville Syrjälä
2015-04-13 10:23 ` Jindal, Sonika
2015-04-13 10:49 ` Ville Syrjälä
2015-04-13 23:39 ` Matt Roper
2015-04-14 12:19 ` Jindal, Sonika
2015-04-14 17:27 ` Daniel Vetter
2015-04-15 10:05 ` [PATCH 1/2] drm/i915: Swapping 90 and 270 to be compliant with Xrandr Sonika Jindal
2015-04-15 10:05 ` [PATCH 2/2] Documentation/drm: Update rotation property with 90/270 and description Sonika Jindal
2015-04-15 10:27 ` Daniel Vetter
2015-04-15 10:29 ` Jindal, Sonika
2015-04-15 10:42 ` Daniel Vetter
2015-04-15 10:35 ` [PATCH] " Sonika Jindal
2015-05-12 12:50 ` [Intel-gfx] " Ville Syrjälä
2015-05-13 4:27 ` Jindal, Sonika
2015-05-20 6:39 ` Jindal, Sonika
2015-05-20 7:49 ` Jindal, Sonika
2015-05-20 14:03 ` Ville Syrjälä
2015-05-28 11:05 ` [PATCH] Documentation/drm: Update rotation property Sonika Jindal
2015-05-28 11:19 ` [Intel-gfx] " Daniel Vetter
2015-05-12 12:35 ` [PATCH 1/2] drm/i915: Swapping 90 and 270 to be compliant with Xrandr Ville Syrjälä
2015-05-20 8:10 ` [PATCH] " Sonika Jindal
2015-05-20 9:15 ` Daniel Vetter
2015-04-13 11:10 ` Damien Lespiau [this message]
2015-04-13 4:02 ` [PATCH 2/2] drm/i915/skl: Support for 90/270 rotation Jindal, Sonika
2015-04-14 3:56 ` shuang.he
2015-10-06 13:32 ` [PATCH 1/2] drm/i915/skl: Allow universal planes to position Tvrtko Ursulin
2015-10-06 14:29 ` Matt Roper
2015-10-06 14:42 ` Ville Syrjälä
2015-10-06 15:16 ` Matt Roper
2015-10-06 16:28 ` Ville Syrjälä
2015-10-07 14:19 ` Daniel Vetter
2015-10-08 8:58 ` Tvrtko Ursulin
2015-10-16 12:23 ` Tvrtko Ursulin
-- strict thread matches above, loose matches on Subject: below --
2015-03-30 8:34 Sonika Jindal
2015-03-30 8:34 ` [PATCH 2/2] drm/i915/skl: Support for 90/270 rotation Sonika Jindal
2015-03-30 12:15 ` shuang.he
2015-04-01 18:22 ` Matt Roper
2015-04-02 4:54 ` Jindal, Sonika
2015-04-02 8:55 ` Tvrtko Ursulin
2015-04-02 15:59 ` Matt Roper
2015-04-06 12:27 ` Jindal, Sonika
2015-04-07 8:13 ` Daniel Vetter
2015-04-07 8:22 ` Jindal, Sonika
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