From 3ba5c569c4a99c43bdac9f0c1c65e15a7b3390b9 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Wed, 25 Aug 2010 13:09:48 -0700 Subject: [PATCH] drm/i915: make sure VDD AUX power has time to settle When turning on or off the VDD AUX bit, we need to give the panel time to start or stop or AUX transactions may fail. Signed-off-by: Jesse Barnes Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_dp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 153a5934b2e1..bcd81f96fc7f 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -825,6 +825,7 @@ static void ironlake_edp_panel_vdd_on(struct drm_device *dev) pp |= EDP_FORCE_VDD; I915_WRITE(PCH_PP_CONTROL, pp); POSTING_READ(PCH_PP_CONTROL); + msleep(300); } static void ironlake_edp_panel_vdd_off(struct drm_device *dev) @@ -836,6 +837,7 @@ static void ironlake_edp_panel_vdd_off(struct drm_device *dev) pp &= ~EDP_FORCE_VDD; I915_WRITE(PCH_PP_CONTROL, pp); POSTING_READ(PCH_PP_CONTROL); + msleep(300); } static void ironlake_edp_backlight_on (struct drm_device *dev) -- 2.20.1