linux-kernel - Re: [PATCH v4 00/11] Enabling 180 degree rotation for sprite and crtc planes

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Date:	Mon, 10 Feb 2014 15:52:12 +0200
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	sagar.a.kamble@...el.com, daniel.vetter@...ll.ch,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	vijay.a.purushothaman@...el.com, tomi.valkeinen@...com,
	dri-devel@...ts.freedesktop.org, gregkh@...uxfoundation.org,
	joe@...ches.com, airlied@...hat.com
Subject: Re: [PATCH v4 00/11] Enabling 180 degree rotation for sprite and
 crtc planes

On Mon, Feb 10, 2014 at 10:41:30AM +0000, One Thousand Gnomes wrote:
> On Fri,  7 Feb 2014 19:15:05 +0530
> sagar.a.kamble@...el.com wrote:
> 
> > From: Sagar Kamble <sagar.a.kamble@...el.com>
> > 
> > These patches will enable 180 degree rotation for CRTC and Sprite planes.
> > Changelog:
> > 1. drm/i915: Add 180 degree primary plane rotation support
> > Addressed review comments for CRTC rotation from FBC, page flip, CRTC active/
> > inactive perspective.
> 
> Does this mean it should also handle horizontal mirroring in
> hardware (180° rotate, and scan lines backwards combined) ?

Our hardware doesn't support mirroring (h or v). Well, unless you
count h+v mirroring since that's 180 degree rotation :)

Anyways IIRC the old video overlay (present on gen2-4) was the only plane
to ever support mirroring on Intel hardware. With all other planes we're
limited to 0 and 180 degree rotation.

-- 
Ville Syrjälä
Intel OTC
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