From b2d03b0ddfc9310be1f35320597487157f829ede Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Mon, 27 Mar 2017 21:55:37 +0300
Subject: [PATCH] drm/i915: Move cursor position and base handling into the platform specific functions
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Git-commit: b2d03b0ddfc9310be1f35320597487157f829ede
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

Supposedly on some platforms we can get extra atomicity guarantees for
CURPOS if we write it between the CURCNTR and CURBASE. Let's move the
CURPOS handling into the platform specific hooks to make the possible
without having to pass the calculated CURPOS around. And while at it,
do the same for the CURBASE to avoid passing that either.

V2: Use I915_WRITE_FW() and grab uncore.lock

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> #v1
Link: http://patchwork.freedesktop.org/patch/msgid/20170327185546.2977-7-ville.syrjala@linux.intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_display.c |   95 ++++++++++++++++++-----------------
 1 file changed, 49 insertions(+), 46 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9213,11 +9213,13 @@ static u32 i845_cursor_ctl(const struct
 		CURSOR_STRIDE(stride);
 }
 
-static void i845_update_cursor(struct intel_plane *plane, u32 base,
+static void i845_update_cursor(struct intel_plane *plane,
+			       const struct intel_crtc_state *crtc_state,
 			       const struct intel_plane_state *plane_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
-	uint32_t cntl = 0, size = 0;
+	u32 cntl = 0, base = 0, pos = 0, size = 0;
+	unsigned long irqflags;
 
 	if (plane_state && plane_state->base.visible) {
 		unsigned int width = plane_state->base.crtc_w;
@@ -9225,8 +9227,13 @@ static void i845_update_cursor(struct in
 
 		cntl = plane_state->ctl;
 		size = (height << 12) | width;
+
+		base = intel_cursor_base(plane_state);
+		pos = intel_cursor_position(plane_state);
 	}
 
+	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
+
 	if (plane->cursor.cntl != 0 &&
 	    (plane->cursor.base != base ||
 	     plane->cursor.size != size ||
@@ -9249,11 +9256,22 @@ static void i845_update_cursor(struct in
 		plane->cursor.size = size;
 	}
 
+	if (cntl)
+		I915_WRITE_FW(CURPOS(PIPE_A), pos);
+
 	if (plane->cursor.cntl != cntl) {
 		I915_WRITE_FW(CURCNTR(PIPE_A), cntl);
 		POSTING_READ_FW(CURCNTR(PIPE_A));
 		plane->cursor.cntl = cntl;
 	}
+
+	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+}
+
+static void i845_disable_cursor(struct intel_plane *plane,
+				struct intel_crtc *crtc)
+{
+	i845_update_cursor(plane, NULL, NULL);
 }
 
 static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
@@ -9292,53 +9310,46 @@ static u32 i9xx_cursor_ctl(const struct
 	return cntl;
 }
 
-static void i9xx_update_cursor(struct intel_plane *plane, u32 base,
+static void i9xx_update_cursor(struct intel_plane *plane,
+			       const struct intel_crtc_state *crtc_state,
 			       const struct intel_plane_state *plane_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	enum pipe pipe = plane->pipe;
-	uint32_t cntl = 0;
+	u32 cntl = 0, base = 0, pos = 0;
+	unsigned long irqflags;
 
-	if (plane_state && plane_state->base.visible)
+	if (plane_state && plane_state->base.visible) {
 		cntl = plane_state->ctl;
 
+		base = intel_cursor_base(plane_state);
+		pos = intel_cursor_position(plane_state);
+	}
+
+	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
+
 	if (plane->cursor.cntl != cntl) {
 		I915_WRITE_FW(CURCNTR(pipe), cntl);
 		POSTING_READ_FW(CURCNTR(pipe));
 		plane->cursor.cntl = cntl;
 	}
 
+	if (cntl)
+		I915_WRITE_FW(CURPOS(pipe), pos);
+
 	/* and commit changes on next vblank */
 	I915_WRITE_FW(CURBASE(pipe), base);
 	POSTING_READ_FW(CURBASE(pipe));
 
+	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+
 	plane->cursor.base = base;
 }
 
-/* If no-part of the cursor is visible on the framebuffer, then the GPU may hang... */
-static void intel_crtc_update_cursor(struct intel_plane *plane,
-				     const struct intel_plane_state *plane_state)
+static void i9xx_disable_cursor(struct intel_plane *plane,
+				struct intel_crtc *crtc)
 {
-	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
-	enum pipe pipe = plane->pipe;
-	u32 pos = 0, base = 0;
-	unsigned long irqflags;
-
-	if (plane_state) {
-		base = intel_cursor_base(plane_state);
-		pos = intel_cursor_position(plane_state);
-	}
-
-	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
-
-	I915_WRITE_FW(CURPOS(pipe), pos);
-
-	if (IS_I845G(dev_priv) || IS_I865G(dev_priv))
-		i845_update_cursor(plane, base, plane_state);
-	else
-		i9xx_update_cursor(plane, base, plane_state);
-
-	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+	i9xx_update_cursor(plane, NULL, NULL);
 }
 
 static bool cursor_size_ok(struct drm_i915_private *dev_priv,
@@ -13739,23 +13750,9 @@ intel_check_cursor_plane(struct intel_pl
 	return 0;
 }
 
-static void
-intel_disable_cursor_plane(struct intel_plane *plane,
-			   struct intel_crtc *crtc)
-{
-	intel_crtc_update_cursor(plane, NULL);
-}
-
-static void
-intel_update_cursor_plane(struct intel_plane *plane,
-			  const struct intel_crtc_state *crtc_state,
-			  const struct intel_plane_state *state)
-{
-	intel_crtc_update_cursor(plane, state);
-}
-
 static struct intel_plane *
-intel_cursor_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
+intel_cursor_plane_create(struct drm_i915_private *dev_priv,
+			  enum pipe pipe)
 {
 	struct intel_plane *cursor = NULL;
 	struct intel_plane_state *state = NULL;
@@ -13782,8 +13779,14 @@ intel_cursor_plane_create(struct drm_i91
 	cursor->id = PLANE_CURSOR;
 	cursor->frontbuffer_bit = INTEL_FRONTBUFFER_CURSOR(pipe);
 	cursor->check_plane = intel_check_cursor_plane;
-	cursor->update_plane = intel_update_cursor_plane;
-	cursor->disable_plane = intel_disable_cursor_plane;
+
+	if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
+		cursor->update_plane = i845_update_cursor;
+		cursor->disable_plane = i845_disable_cursor;
+	} else {
+		cursor->update_plane = i9xx_update_cursor;
+		cursor->disable_plane = i9xx_disable_cursor;
+	}
 
 	cursor->cursor.base = ~0;
 	cursor->cursor.cntl = ~0;