drm/i915: disable temporal dithering on the internal panel

<ajax> i'm getting tempted to just disable temporal
<mjg59> Approved.
<ajax> apparently it makes the screen look pulse-y which is worse
than the disease.

References: http://lists.freedesktop.org/archives/intel-gfx/2011-October/012545.html
Tested-by: Олег Герман <oleg.german@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 981b1f1..b75bd93 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5671,7 +5671,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
        pipeconf &= ~PIPECONF_DITHER_TYPE_MASK;
        if ((is_lvds && dev_priv->lvds_dither) || dither) {
                pipeconf |= PIPECONF_DITHER_EN;
-               pipeconf |= PIPECONF_DITHER_TYPE_ST1;
+               pipeconf |= PIPECONF_DITHER_TYPE_SP;
        }
        if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
                intel_dp_set_m_n(crtc, mode, adjusted_mode);