linux-ec2/i915-fix-ghost-tv-output.patch

   1 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
   2 Tested-by: Santi <santi@agolina.net>
   3 ---
   4  drivers/gpu/drm/i915/intel_tv.c |    9 +++++++++
   5  1 files changed, 9 insertions(+), 0 deletions(-)
   6
   7 diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
   8 index dc83b7a..c8f67bf 100644
   9 --- a/drivers/gpu/drm/i915/intel_tv.c
  10 +++ b/drivers/gpu/drm/i915/intel_tv.c
  11 @@ -1267,6 +1267,15 @@
  12                    DAC_B_0_7_V |
  13                    DAC_C_0_7_V);
  14
  15 +       /*
  16 +        * The TV sense state should be cleared to zero on cantiga platform. Otherwise
  17 +        * the TV is misdetected. This is hardware requirement.
  18 +        */
  19 +       if (IS_GM45(dev))
  20 +               tv_dac &= ~(TVDAC_STATE_CHG_EN | TVDAC_A_SENSE_CTL |
  21 +                           TVDAC_B_SENSE_CTL | TVDAC_C_SENSE_CTL);
  22 +
  23 +
  24         I915_WRITE(TV_CTL, tv_ctl);
  25         I915_WRITE(TV_DAC, tv_dac);
  26         POSTING_READ(TV_DAC);