drm/radeon: make sure vertical front porch is at least 1

commit 3104b8128d upstream.

hw doesn't like a 0 value.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher 2016-05-02 18:53:27 -04:00 • committed by Greg Kroah-Hartman
commit 6b5f7a680d