From: Clemens Ladisch <clemens@ladisch.de>
Date: Wed, 4 Nov 2009 08:42:52 +0000 (+0100)
Subject: drm/fb: fix FBIOGET/PUT_VSCREENINFO pixel clock handling
X-Git-Tag: v2.6.32~51^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5349ef3127c77075ff70b2014f17ae0fbcaaf199;p=pandora-kernel.git

drm/fb: fix FBIOGET/PUT_VSCREENINFO pixel clock handling

When the framebuffer driver does not publish detailed timing information
for the current video mode, the correct value for the pixclock field is
zero, not -1.

Since pixclock is actually unsigned, the value -1 would be interpreted
as 4294967295 picoseconds (i.e., about 4 milliseconds) by
register_framebuffer() and userspace programs.

This patch allows X.org's fbdev driver to work.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Tested-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

Reading git-diff-tree failed