target/linux/bcm27xx/patches-5.4/950-0545-drm-vc4-plane-Create-more-planes.patch

   1 From b79a33509a3aa863cdf54d24e1a4a0cc2c6fe84c Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Thu, 6 Feb 2020 14:52:42 +0100
   4 Subject: [PATCH] drm/vc4: plane: Create more planes
   5
   6 Let's now create more planes that can be affected to all the CRTCs.
   7
   8 vc4 has 3 CRTCs, 1 primary and 1 cursor each, and was having 24 (8
   9 planes per CRTC) overlays.
  10
  11 However, vc5 has 5 CRTCs, so keeping the same logic would put us at 50
  12 planes which is well above the 32 planes limit imposed by DRM.
  13
  14 Using 16 seems like a good tradeoff between staying under 32 and yet
  15 providing enough planes.
  16
  17 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  18 ---
  19  drivers/gpu/drm/vc4/vc4_plane.c | 2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 --- a/drivers/gpu/drm/vc4/vc4_plane.c
  23 +++ b/drivers/gpu/drm/vc4/vc4_plane.c
  24 @@ -1463,7 +1463,7 @@ int vc4_plane_create_additional_planes(s
  25          * modest number of planes to expose, that should hopefully
  26          * still cover any sane usecase.
  27          */
  28 -       for (i = 0; i < 8; i++) {
  29 +       for (i = 0; i < 16; i++) {
  30                 struct drm_plane *plane =
  31                         vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
  32