drm/i915: Split vlv/chv sprite plane update into noarm+arm pair

Chop vlv_sprite_update() into two halves. Fist half becomes
the _noarm() variant, second part the _arm() variant.

Fortunately I have already previously grouped the register
writes into roughtly the correct order, so the split looks
surprisingly clean.

Looks like most of the hardware logic was copied from the
pre-ctg sprite C, so SPSTRIDE/POS/SIZE are armed by SPSURF,
while the rest are self arming. SPCONSTALPHA is the one
entirely new register that didn't exist in the old sprite C,
and looks like that one is self arming. The CHV pipe B CSC
is also self arming, like the rest of the CHV pipe B
additions.

I didn't have time to capture i915_update_info numbers for
these, but since all the other platforms generally showed
improvements, and crucially no regression, I am fairly
confident this should behave similarly.

Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018115030.3547-10-ville.syrjala@linux.intel.comReviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

drivers/gpu/drm/i915/display/intel_sprite.c

@@ -417,35 +417,24 @@ static void vlv_sprite_update_gamma(const struct intel_plane_state *plane_state)
 				  gamma[i] << 16 | gamma[i] << 8 | gamma[i]);
 }
 
-/* TODO: split into noarm+arm pair */
 static void
-vlv_sprite_update_arm(struct intel_plane *plane,
-		      const struct intel_crtc_state *crtc_state,
-		      const struct intel_plane_state *plane_state)
+vlv_sprite_update_noarm(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;
 	enum plane_id plane_id = plane->id;
-	u32 sprsurf_offset = plane_state->view.color_plane[0].offset;
-	u32 linear_offset;
-	const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
 	int crtc_x = plane_state->uapi.dst.x1;
 	int crtc_y = plane_state->uapi.dst.y1;
 	u32 crtc_w = drm_rect_width(&plane_state->uapi.dst);
 	u32 crtc_h = drm_rect_height(&plane_state->uapi.dst);
-	u32 x = plane_state->view.color_plane[0].x;
-	u32 y = plane_state->view.color_plane[0].y;
 	unsigned long irqflags;
-	u32 sprctl;
-
-	sprctl = plane_state->ctl | vlv_sprite_ctl_crtc(crtc_state);
 
 	/* Sizes are 0 based */
 	crtc_w--;
 	crtc_h--;
 
-	linear_offset = intel_fb_xy_to_linear(x, y, plane_state, 0);
-
 	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
 	intel_de_write_fw(dev_priv, SPSTRIDE(pipe, plane_id),
@@ -454,7 +443,30 @@ vlv_sprite_update_arm(struct intel_plane *plane,
 			  (crtc_y << 16) | crtc_x);
 	intel_de_write_fw(dev_priv, SPSIZE(pipe, plane_id),
 			  (crtc_h << 16) | crtc_w);
-	intel_de_write_fw(dev_priv, SPCONSTALPHA(pipe, plane_id), 0);
+
+	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+}
+
+static void
+vlv_sprite_update_arm(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;
+	enum plane_id plane_id = plane->id;
+	const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
+	u32 sprsurf_offset = plane_state->view.color_plane[0].offset;
+	u32 x = plane_state->view.color_plane[0].x;
+	u32 y = plane_state->view.color_plane[0].y;
+	u32 sprctl, linear_offset;
+	unsigned long irqflags;
+
+	sprctl = plane_state->ctl | vlv_sprite_ctl_crtc(crtc_state);
+
+	linear_offset = intel_fb_xy_to_linear(x, y, plane_state, 0);
+
+	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
 	if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B)
 		chv_sprite_update_csc(plane_state);
@@ -468,6 +480,8 @@ vlv_sprite_update_arm(struct intel_plane *plane,
 				  key->max_value);
 	}
 
+	intel_de_write_fw(dev_priv, SPCONSTALPHA(pipe, plane_id), 0);
+
 	intel_de_write_fw(dev_priv, SPLINOFF(pipe, plane_id), linear_offset);
 	intel_de_write_fw(dev_priv, SPTILEOFF(pipe, plane_id), (y << 16) | x);
 
@@ -1771,6 +1785,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 		return plane;
 
 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+		plane->update_noarm = vlv_sprite_update_noarm;
 		plane->update_arm = vlv_sprite_update_arm;
 		plane->disable_arm = vlv_sprite_disable_arm;
 		plane->get_hw_state = vlv_sprite_get_hw_state;