Re: [RFC 2.6.28 1/2] fbdev: add damage support

[Magnus Damm <magnus.damm@gmail.com>]

On Sun, Jan 25, 2009 at 9:15 PM, Jaya Kumar <jayakumar.lkml@gmail.com> wrote:
> This is version 2 of an idea about allowing userspace to provide damage
> information to drivers. Thanks to Magnus, Tomi, and others for discussion
> and ideas.

...

> This patch adds the ability for userspace applications to provide damage
> information to the underlying driver. This is useful in scenarios where the
> underlying driver can perform transfer optimizations based on knowing
> exactly which framebuffer areas that were updated. This functionality is
> exposed by using a simple x,y,w,h bounding box structure. Userspace is
> expected to perform its damage and then perform the ioctl. The underlying
> driver is free to use this information as it sees fit including ignoring it
> if it chooses to. An example use case will be provided in the case of
> broadsheetfb.c where the damage information is aggregated for deferred use.
>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
> Cc: Magnus Damm <magnus.damm@gmail.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@nokia.com>
> Cc: armbru@redhat.com
> Cc: lethal@linux-sh.org
> Cc: adaplas@gmail.com
> Cc: linux-fbdev-devel@lists.sourceforge.net
> Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>

Looking good except that the patch doesn't apply on new kernels.

Acked-by: Magnus Damm <damm@igel.co.jp>

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