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authorDaniel Vetter <daniel.vetter@ffwll.ch>2012-03-25 22:56:14 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-03-27 13:12:28 +0200
commitd42c9e2c24f7e7897405b85816bdf4ac924881c0 (patch)
treedb2208b7040ebfaa1fe2b7aadcd127504dd7fac4 /drivers/gpu/drm/i915/intel_tv.c
parent1d83f4426fa0555c98c989915be6df01a8125aca (diff)
drm/i915: reinstate GM45 TV detection fix
This reverts commmit d4b74bf07873da2e94219a7b67a334fc1c3ce649 which reverted the origin fix fb8b5a39b6310379d7b54c0c7113703a8eaf4a57. We have at least 3 different bug reports that this fixes things and no indication what is exactly wrong with this. So try again. To make matters slightly more fun, the commit itself was cc: stable whereas the revert has not been. According to Peter Clifton he discussed this with Zhao Yakui and this seems to be in contradiction of the GM45 PRM, but rumours have it that this is how the BIOS does it ... let's see. Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com> Tested-by: Peter Clifton <Peter.Clifton@clifton-electronics.com> Cc: Zhao Yakui <yakui.zhao@intel.com> Cc: Dave Airlie <airlied@redhat.com> Cc: Eric Anholt <eric@anholt.net> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16236 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=25913 Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=14792 Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_tv.c')
-rw-r--r--drivers/gpu/drm/i915/intel_tv.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 05f765ef546..ca12c709f3e 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1153,6 +1153,15 @@ intel_tv_detect_type(struct intel_tv *intel_tv,
DAC_B_0_7_V |
DAC_C_0_7_V);
+
+ /*
+ * The TV sense state should be cleared to zero on cantiga platform. Otherwise
+ * the TV is misdetected. This is hardware requirement.
+ */
+ if (IS_GM45(dev))
+ tv_dac &= ~(TVDAC_STATE_CHG_EN | TVDAC_A_SENSE_CTL |
+ TVDAC_B_SENSE_CTL | TVDAC_C_SENSE_CTL);
+
I915_WRITE(TV_CTL, tv_ctl);
I915_WRITE(TV_DAC, tv_dac);
POSTING_READ(TV_DAC);