drm/vc4: plane: Add more debugging for LBM allocation

LBM allocations need a different size depending on the line length,
format, etc.

This can get tricky, and fail. Let's add some more prints to ease the
debugging when it does.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240621152055.4180873-12-dave.stevenson@raspberrypi.com
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

drivers/gpu/drm/vc4/vc4_plane.c

@@ -741,6 +741,7 @@ static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
 {
 	struct drm_device *drm = state->plane->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
+	struct drm_plane *plane = state->plane;
 	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
 	unsigned long irqflags;
 	u32 lbm_size;
@@ -749,6 +750,9 @@ static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
 	if (!lbm_size)
 		return 0;
 
+	drm_dbg_driver(drm, "[PLANE:%d:%s] LBM Allocation Size: %u\n",
+		       plane->base.id, plane->name, lbm_size);
+
 	if (WARN_ON(!vc4_state->lbm_offset))
 		return -EINVAL;