linux-kernel - Re: [PATCH v2 4/7] imx-drm: ipuv3-crtc: Implement mode

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Message-ID: <20141220155254.GJ11285@n2100.arm.linux.org.uk>
Date:	Sat, 20 Dec 2014 15:52:54 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Steve Longerbeam <slongerbeam@...il.com>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Denis Carikli <denis@...rea.com>,
	Jiada Wang <jiada_wang@...tor.com>,
	Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v2 4/7] imx-drm: ipuv3-crtc: Implement mode_fixup

On Thu, Dec 18, 2014 at 06:00:23PM -0800, Steve Longerbeam wrote:
> Ask the IPU display interface, via ipu_di_adjust_videomode(), to
> adjust a video mode to meet any DI restrictions. The function takes
> a subsystem independent videomode, so the drm_display_mode must be
> converted to videomode first, and then the adjusted mode converted
> back to a drm_display_mode.

What is the reason to use videomode (apart from it being subsystem
independent)?  Do we forsee implementation of other output subsystems
for the IPU?

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