i915: Fix spurious TV detection after 9d0498a2bf + 9559fcdbff

Partial revert of 9d0498a2bf.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Tested-by: Hugh Dickins <hughd@google.com>
Tested-by: Sven Joachim <svenjoac@gmx.de>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index d2029efee982c3baff92538556ddae0b7a44ea9b..c671f60ce80bac917a61c1c60cdb02e692afcb85 100644 (file)
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1231,7 +1231,6 @@ intel_tv_detect_type (struct intel_tv *intel_tv)
        struct drm_encoder *encoder = &intel_tv->base.enc;
        struct drm_device *dev = encoder->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
-       struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
        unsigned long irqflags;
        u32 tv_ctl, save_tv_ctl;
        u32 tv_dac, save_tv_dac;
@@ -1268,11 +1267,15 @@ intel_tv_detect_type (struct intel_tv *intel_tv)
                   DAC_C_0_7_V);
        I915_WRITE(TV_CTL, tv_ctl);
        I915_WRITE(TV_DAC, tv_dac);
-       intel_wait_for_vblank(dev, intel_crtc->pipe);
+       POSTING_READ(TV_DAC);
+       msleep(20);
+
        tv_dac = I915_READ(TV_DAC);
        I915_WRITE(TV_DAC, save_tv_dac);
        I915_WRITE(TV_CTL, save_tv_ctl);
-       intel_wait_for_vblank(dev, intel_crtc->pipe);
+       POSTING_READ(TV_CTL);
+       msleep(20);
+
        /*
         *  A B C
         *  0 1 1 Composite