drm/i915: Move cursor position and base handling into the platform specific functions

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

drivers/gpu/drm/i915/intel_display.c

@@ -9203,11 +9203,13 @@ static u32 i845_cursor_ctl(const struct intel_crtc_state *crtc_state,
 		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;
@@ -9215,8 +9217,13 @@ static void i845_update_cursor(struct intel_plane *plane, u32 base,
 
 		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 ||
@@ -9239,11 +9246,22 @@ static void i845_update_cursor(struct intel_plane *plane, u32 base,
 		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,
@@ -9282,53 +9300,46 @@ static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
 	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,
@@ -13726,23 +13737,9 @@ intel_check_cursor_plane(struct intel_plane *plane,
 	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;
@@ -13769,8 +13766,14 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 	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;