drm/i915: make sure panel is sequenced off when starting a mode set

Otherwise we may not be able to train the DP link.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index bcd81f9..27805a9 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -894,6 +894,7 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
        uint32_t dp_reg = I915_READ(intel_dp->output_reg);
 
        if (IS_eDP(intel_dp) || IS_PCH_eDP(intel_dp)) {
+               ironlake_edp_panel_off(dev);
                ironlake_edp_backlight_off(dev);
                ironlake_edp_panel_vdd_on(dev);
                ironlake_edp_pll_on(encoder);