tree 765f0c61ea044e771be9a93c84c28ecaa0874a2b
parent bfac4d6725baacbfc085c38e231b8582a1b8f62b
author Zhao Yakui <yakui.zhao@intel.com> 1270631479 +0800
committer Eric Anholt <eric@anholt.net> 1270873606 -0700

drm/i915: Configure the TV sense state correctly on GM45 to make TV detection reliable

The TV detection logic is not reliable on the Cantiga platform.
Sometimes the TV will be misdetected as the following two cases:
- TV is misdetected on some laptops. e.g. There is no TV connector
port or no TV is attached. But the TV is shown as connected.
- TV connector type is misdetected. e.g. the component TV is
attached, but the TV is shown as S-video type.

According to the hardware requirement, the TV sense state bits of TV DAC
register should be cleared to zero on Cantiga platfrom.

https://bugzilla.kernel.org/show_bug.cgi?id=14792

Cc: Stable Team <stable@kernel.org>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Tested-by: Santi <santi@agolina.net>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>