From: Keith Packard <keithp@keithp.com>
Date: Thu, 29 Sep 2011 23:33:01 +0000 (-0700)
Subject: drm/i915: Restrict ILK-specific eDP power hack to ILK
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=05ce1a4961cffd7b0c8d4b70a7c9fa341368bc48;p=deliverable%2Flinux.git

drm/i915: Restrict ILK-specific eDP power hack to ILK

This eliminates a fairly long delay when power sequencing newer
hardware

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e880a04c722f..f5303e18e791 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -992,10 +992,12 @@ static void ironlake_edp_panel_on (struct intel_dp *intel_dp)
 	pp &= ~PANEL_UNLOCK_MASK;
 	pp |= PANEL_UNLOCK_REGS;
 
-	/* ILK workaround: disable reset around power sequence */
-	pp &= ~PANEL_POWER_RESET;
-	I915_WRITE(PCH_PP_CONTROL, pp);
-	POSTING_READ(PCH_PP_CONTROL);
+	if (IS_GEN5(dev)) {
+		/* ILK workaround: disable reset around power sequence */
+		pp &= ~PANEL_POWER_RESET;
+		I915_WRITE(PCH_PP_CONTROL, pp);
+		POSTING_READ(PCH_PP_CONTROL);
+	}
 
 	pp |= POWER_TARGET_ON;
 	I915_WRITE(PCH_PP_CONTROL, pp);
@@ -1006,9 +1008,11 @@ static void ironlake_edp_panel_on (struct intel_dp *intel_dp)
 		DRM_ERROR("panel on wait timed out: 0x%08x\n",
 			  I915_READ(PCH_PP_STATUS));
 
-	pp |= PANEL_POWER_RESET; /* restore panel reset bit */
-	I915_WRITE(PCH_PP_CONTROL, pp);
-	POSTING_READ(PCH_PP_CONTROL);
+	if (IS_GEN5(dev)) {
+		pp |= PANEL_POWER_RESET; /* restore panel reset bit */
+		I915_WRITE(PCH_PP_CONTROL, pp);
+		POSTING_READ(PCH_PP_CONTROL);
+	}
 }
 
 static void ironlake_edp_panel_off(struct drm_encoder *encoder)
@@ -1025,24 +1029,32 @@ static void ironlake_edp_panel_off(struct drm_encoder *encoder)
 	pp &= ~PANEL_UNLOCK_MASK;
 	pp |= PANEL_UNLOCK_REGS;
 
-	/* ILK workaround: disable reset around power sequence */
-	pp &= ~PANEL_POWER_RESET;
-	I915_WRITE(PCH_PP_CONTROL, pp);
-	POSTING_READ(PCH_PP_CONTROL);
+	if (IS_GEN5(dev)) {
+		/* ILK workaround: disable reset around power sequence */
+		pp &= ~PANEL_POWER_RESET;
+		I915_WRITE(PCH_PP_CONTROL, pp);
+		POSTING_READ(PCH_PP_CONTROL);
+	}
 
-	pp &= ~POWER_TARGET_ON;
-	I915_WRITE(PCH_PP_CONTROL, pp);
-	POSTING_READ(PCH_PP_CONTROL);
-	msleep(intel_dp->panel_power_cycle_delay);
+	intel_dp->panel_off_jiffies = jiffies;
 
-	if (wait_for((I915_READ(PCH_PP_STATUS) & idle_off_mask) == 0, 5000))
-		DRM_ERROR("panel off wait timed out: 0x%08x\n",
-			  I915_READ(PCH_PP_STATUS));
+	if (IS_GEN5(dev)) {
+		pp &= ~POWER_TARGET_ON;
+		I915_WRITE(PCH_PP_CONTROL, pp);
+		POSTING_READ(PCH_PP_CONTROL);
+		pp &= ~POWER_TARGET_ON;
+		I915_WRITE(PCH_PP_CONTROL, pp);
+		POSTING_READ(PCH_PP_CONTROL);
+		msleep(intel_dp->panel_power_cycle_delay);
 
-	pp |= PANEL_POWER_RESET; /* restore panel reset bit */
-	I915_WRITE(PCH_PP_CONTROL, pp);
-	POSTING_READ(PCH_PP_CONTROL);
-	intel_dp->panel_off_jiffies = jiffies;
+		if (wait_for((I915_READ(PCH_PP_STATUS) & idle_off_mask) == 0, 5000))
+			DRM_ERROR("panel off wait timed out: 0x%08x\n",
+				  I915_READ(PCH_PP_STATUS));
+
+		pp |= PANEL_POWER_RESET; /* restore panel reset bit */
+		I915_WRITE(PCH_PP_CONTROL, pp);
+		POSTING_READ(PCH_PP_CONTROL);
+	}
 }
 
 static void ironlake_edp_backlight_on (struct intel_dp *intel_dp)