drm/i915: Use enum plane_id for frontbuffer tracking

Replace the ad-hoc plane indexing scheme used by the frontbuffer
tracking with enum plane_id.

The old video overlay not being part of the plane_id namespace
will just be given the high bit.

v2: Drop the unintended whitespace change (Chris)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180123183343.9181-1-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_drv.h

@@ -2410,16 +2410,11 @@ enum hdmi_force_audio {
  *
  * We have one bit per pipe and per scanout plane type.
  */
-#define INTEL_MAX_SPRITE_BITS_PER_PIPE 5
 #define INTEL_FRONTBUFFER_BITS_PER_PIPE 8
-#define INTEL_FRONTBUFFER_PRIMARY(pipe) \
-	(1 << (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
-#define INTEL_FRONTBUFFER_CURSOR(pipe) \
-	(1 << (1 + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
-#define INTEL_FRONTBUFFER_SPRITE(pipe, plane) \
-	(1 << (2 + plane + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
+#define INTEL_FRONTBUFFER(pipe, plane_id) \
+	(1 << ((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
 #define INTEL_FRONTBUFFER_OVERLAY(pipe) \
-	(1 << (2 + INTEL_MAX_SPRITE_BITS_PER_PIPE + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
+	(1 << (INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
 #define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
 	(0xff << (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
 

drivers/gpu/drm/i915/intel_display.c

@@ -13149,7 +13149,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 	else
 		primary->i9xx_plane = (enum i9xx_plane_id) pipe;
 	primary->id = PLANE_PRIMARY;
-	primary->frontbuffer_bit = INTEL_FRONTBUFFER_PRIMARY(pipe);
+	primary->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, primary->id);
 	primary->check_plane = intel_check_primary_plane;
 
 	if (INTEL_GEN(dev_priv) >= 9) {
@@ -13270,7 +13270,7 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv,
 	cursor->pipe = pipe;
 	cursor->i9xx_plane = (enum i9xx_plane_id) pipe;
 	cursor->id = PLANE_CURSOR;
-	cursor->frontbuffer_bit = INTEL_FRONTBUFFER_CURSOR(pipe);
+	cursor->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, cursor->id);
 
 	if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
 		cursor->update_plane = i845_update_cursor;

drivers/gpu/drm/i915/intel_fbc.c

@@ -1373,7 +1373,7 @@ void intel_fbc_init(struct drm_i915_private *dev_priv)
 
 	for_each_pipe(dev_priv, pipe) {
 		fbc->possible_framebuffer_bits |=
-				INTEL_FRONTBUFFER_PRIMARY(pipe);
+			INTEL_FRONTBUFFER(pipe, PLANE_PRIMARY);
 
 		if (fbc_on_pipe_a_only(dev_priv))
 			break;

drivers/gpu/drm/i915/intel_sprite.c

@@ -1423,7 +1423,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 	intel_plane->pipe = pipe;
 	intel_plane->i9xx_plane = plane;
 	intel_plane->id = PLANE_SPRITE0 + plane;
-	intel_plane->frontbuffer_bit = INTEL_FRONTBUFFER_SPRITE(pipe, plane);
+	intel_plane->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, intel_plane->id);
 	intel_plane->check_plane = intel_check_sprite_plane;
 
 	possible_crtcs = (1 << pipe);