From: Marek Olšák <maraeo@gmail.com>
Date: Thu, 17 Dec 2009 05:02:28 +0000 (+0100)
Subject: drm/radeon/kms: allow rendering while no colorbuffer is set on r300
X-Git-Tag: v2.6.33-rc2~19^2^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=46c64d4bfa01cda7d58c514164f8b127ab6741b7;p=pandora-kernel.git

drm/radeon/kms: allow rendering while no colorbuffer is set on r300

Because hardware cannot disable all colorbuffers directly to do depth-only
rendering, a user should:
- disable reading from a colorbuffer in blending
- disable fastfill
- set the color channel mask to 0 to prevent writing to a colorbuffer

Signed-off-by: Dave Airlie <airlied@redhat.com>
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