[PATCH 2/2] drm/i915: clean up panel fitter handling in lvds

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

commit c1d1f5aeda2033d96e872f416388653f05d4c16d
Author: Mika Kuoppala <mika.kuoppala@intel.com>
Date:   Tue Feb 5 17:26:52 2013 +0200

    drm/i915: disable shared panel fitter for pipe

moved panel fit disabling to be crtc property. Thus
the need to explicitly turn pfit off in encoder side
became obsolete. Take advantage of that and get rid of
pfit_dirty state handling in lvds.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |    5 ++++
 drivers/gpu/drm/i915/intel_lvds.c    |   47 +++++++++++++++++-----------------
 2 files changed, 29 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9b5f0fb..175538d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3615,6 +3615,11 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 	intel_update_watermarks(dev);
 
 	intel_enable_pll(dev_priv, pipe);
+
+	for_each_encoder_on_crtc(dev, crtc, encoder)
+		if (encoder->pre_enable)
+			encoder->pre_enable(encoder);
+
 	intel_enable_pipe(dev_priv, pipe, false);
 	intel_enable_plane(dev_priv, plane, pipe);
 
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 7e4ec63..f93058a 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -51,7 +51,6 @@ struct intel_lvds_encoder {
 
 	u32 pfit_control;
 	u32 pfit_pgm_ratios;
-	bool pfit_dirty;
 	bool is_dual_link;
 	u32 reg;
 
@@ -151,6 +150,29 @@ static void intel_pre_pll_enable_lvds(struct intel_encoder *encoder)
 	I915_WRITE(lvds_encoder->reg, temp);
 }
 
+static void intel_pre_enable_lvds(struct intel_encoder *encoder)
+{
+	struct drm_device *dev = encoder->base.dev;
+	struct intel_lvds_encoder *enc = to_lvds_encoder(&encoder->base);
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	if (HAS_PCH_SPLIT(dev) || !enc->pfit_control)
+		return;
+
+	/*
+	 * Enable automatic panel scaling so that non-native modes
+	 * fill the screen.  The panel fitter should only be
+	 * adjusted whilst the pipe is disabled, according to
+	 * register description and PRM.
+	 */
+	DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
+		      enc->pfit_control,
+		      enc->pfit_pgm_ratios);
+
+	I915_WRITE(PFIT_PGM_RATIOS, enc->pfit_pgm_ratios);
+	I915_WRITE(PFIT_CONTROL, enc->pfit_control);
+}
+
 /**
  * Sets the power state for the panel.
  */
@@ -172,22 +194,6 @@ static void intel_enable_lvds(struct intel_encoder *encoder)
 
 	I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 
-	if (lvds_encoder->pfit_dirty) {
-		/*
-		 * Enable automatic panel scaling so that non-native modes
-		 * fill the screen.  The panel fitter should only be
-		 * adjusted whilst the pipe is disabled, according to
-		 * register description and PRM.
-		 */
-		DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
-			      lvds_encoder->pfit_control,
-			      lvds_encoder->pfit_pgm_ratios);
-
-		I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
-		I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
-		lvds_encoder->pfit_dirty = false;
-	}
-
 	I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 	POSTING_READ(lvds_encoder->reg);
 	if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
@@ -217,11 +223,6 @@ static void intel_disable_lvds(struct intel_encoder *encoder)
 	if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 		DRM_ERROR("timed out waiting for panel to power off\n");
 
-	if (lvds_encoder->pfit_control) {
-		I915_WRITE(PFIT_CONTROL, 0);
-		lvds_encoder->pfit_dirty = true;
-	}
-
 	I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 	POSTING_READ(lvds_encoder->reg);
 }
@@ -461,7 +462,6 @@ out:
 	    pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 		lvds_encoder->pfit_control = pfit_control;
 		lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
-		lvds_encoder->pfit_dirty = true;
 	}
 	dev_priv->lvds_border_bits = border;
 
@@ -1109,6 +1109,7 @@ bool intel_lvds_init(struct drm_device *dev)
 			 DRM_MODE_ENCODER_LVDS);
 
 	intel_encoder->enable = intel_enable_lvds;
+	intel_encoder->pre_enable = intel_pre_enable_lvds;
 	intel_encoder->pre_pll_enable = intel_pre_pll_enable_lvds;
 	intel_encoder->disable = intel_disable_lvds;
 	intel_encoder->get_hw_state = intel_lvds_get_hw_state;
-- 
1.7.9.5