drm/i915: Get rid of the "sizes are 0 based" stuff

Replace the "sizes are 0 based" stuff with just straight
up -1 where needed. Less confusing all around.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211201152552.7821-4-ville.syrjala@linux.intel.comReviewed-by: José Roberto de Souza <jose.souza@intel.com>

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

@@ -431,10 +431,6 @@ vlv_sprite_update_noarm(struct intel_plane *plane,
 	u32 crtc_h = drm_rect_height(&plane_state->uapi.dst);
 	unsigned long irqflags;
 
-	/* Sizes are 0 based */
-	crtc_w--;
-	crtc_h--;
-
 	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
 	intel_de_write_fw(dev_priv, SPSTRIDE(pipe, plane_id),
@@ -442,7 +438,7 @@ vlv_sprite_update_noarm(struct intel_plane *plane,
 	intel_de_write_fw(dev_priv, SPPOS(pipe, plane_id),
 			  (crtc_y << 16) | crtc_x);
 	intel_de_write_fw(dev_priv, SPSIZE(pipe, plane_id),
-			  (crtc_h << 16) | crtc_w);
+			  ((crtc_h - 1) << 16) | (crtc_w - 1));
 
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
@@ -866,21 +862,15 @@ ivb_sprite_update_noarm(struct intel_plane *plane,
 	u32 sprscale = 0;
 	unsigned long irqflags;
 
-	/* Sizes are 0 based */
-	src_w--;
-	src_h--;
-	crtc_w--;
-	crtc_h--;
-
 	if (crtc_w != src_w || crtc_h != src_h)
-		sprscale = SPRITE_SCALE_ENABLE | (src_w << 16) | src_h;
+		sprscale = SPRITE_SCALE_ENABLE | ((src_w - 1) << 16) | (src_h - 1);
 
 	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
 	intel_de_write_fw(dev_priv, SPRSTRIDE(pipe),
 			  plane_state->view.color_plane[0].mapping_stride);
 	intel_de_write_fw(dev_priv, SPRPOS(pipe), (crtc_y << 16) | crtc_x);
-	intel_de_write_fw(dev_priv, SPRSIZE(pipe), (crtc_h << 16) | crtc_w);
+	intel_de_write_fw(dev_priv, SPRSIZE(pipe), ((crtc_h - 1) << 16) | (crtc_w - 1));
 	if (IS_IVYBRIDGE(dev_priv))
 		intel_de_write_fw(dev_priv, SPRSCALE(pipe), sprscale);
 
@@ -1208,21 +1198,15 @@ g4x_sprite_update_noarm(struct intel_plane *plane,
 	u32 dvsscale = 0;
 	unsigned long irqflags;
 
-	/* Sizes are 0 based */
-	src_w--;
-	src_h--;
-	crtc_w--;
-	crtc_h--;
-
 	if (crtc_w != src_w || crtc_h != src_h)
-		dvsscale = DVS_SCALE_ENABLE | (src_w << 16) | src_h;
+		dvsscale = DVS_SCALE_ENABLE | ((src_w - 1) << 16) | (src_h - 1);
 
 	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
 	intel_de_write_fw(dev_priv, DVSSTRIDE(pipe),
 			  plane_state->view.color_plane[0].mapping_stride);
 	intel_de_write_fw(dev_priv, DVSPOS(pipe), (crtc_y << 16) | crtc_x);
-	intel_de_write_fw(dev_priv, DVSSIZE(pipe), (crtc_h << 16) | crtc_w);
+	intel_de_write_fw(dev_priv, DVSSIZE(pipe), ((crtc_h - 1) << 16) | (crtc_w - 1));
 	intel_de_write_fw(dev_priv, DVSSCALE(pipe), dvsscale);
 
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

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

@@ -1033,10 +1033,6 @@ skl_program_plane_noarm(struct intel_plane *plane,
 	u32 src_h = drm_rect_height(&plane_state->uapi.src) >> 16;
 	unsigned long irqflags;
 
-	/* Sizes are 0 based */
-	src_w--;
-	src_h--;
-
 	/* The scaler will handle the output position */
 	if (plane_state->scaler_id >= 0) {
 		crtc_x = 0;
@@ -1056,7 +1052,7 @@ skl_program_plane_noarm(struct intel_plane *plane,
 	intel_de_write_fw(dev_priv, PLANE_POS(pipe, plane_id),
 			  (crtc_y << 16) | crtc_x);
 	intel_de_write_fw(dev_priv, PLANE_SIZE(pipe, plane_id),
-			  (src_h << 16) | src_w);
+			  ((src_h - 1) << 16) | (src_w - 1));
 
 	if (intel_fb_is_rc_ccs_cc_modifier(fb->modifier)) {
 		intel_de_write_fw(dev_priv, PLANE_CC_VAL(pipe, plane_id, 0),