target/linux/bcm27xx/patches-5.4/950-0231-drm-vc4-Expose-the-format-modifiers-for-firmware-kms.patch

   1 From c27d4bbba9593a6ded8f482610a0247da66d78a9 Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Mon, 18 Mar 2019 16:38:32 -0700
   4 Subject: [PATCH] drm/vc4: Expose the format modifiers for firmware
   5  kms.
   6
   7 This should technically not expose VC4_T_TILED on pi4.  However, if we
   8 don't expose anything, then userspace will assume that display can
   9 handle whatever modifiers 3d can do (UIF on 2711).  By exposing a
  10 list, that will get intersected with what 3D can do so that we get T
  11 tiling for display on 2710 and linear on 2711.
  12
  13 Signed-off-by: Eric Anholt <eric@anholt.net>
  14 ---
  15  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 33 +++++++++++++++++++++++++-
  16  1 file changed, 32 insertions(+), 1 deletion(-)
  17
  18 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  19 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  20 @@ -281,6 +281,27 @@ static void vc4_plane_destroy(struct drm
  21         drm_plane_cleanup(plane);
  22  }
  23
  24 +static bool vc4_fkms_format_mod_supported(struct drm_plane *plane,
  25 +                                         uint32_t format,
  26 +                                         uint64_t modifier)
  27 +{
  28 +       /* Support T_TILING for RGB formats only. */
  29 +       switch (format) {
  30 +       case DRM_FORMAT_XRGB8888:
  31 +       case DRM_FORMAT_ARGB8888:
  32 +               switch (modifier) {
  33 +               case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED:
  34 +               case DRM_FORMAT_MOD_LINEAR:
  35 +               case DRM_FORMAT_MOD_BROADCOM_UIF:
  36 +                       return true;
  37 +               default:
  38 +                       return false;
  39 +               }
  40 +       default:
  41 +               return false;
  42 +       }
  43 +}
  44 +
  45  static const struct drm_plane_funcs vc4_plane_funcs = {
  46         .update_plane = drm_atomic_helper_update_plane,
  47         .disable_plane = drm_atomic_helper_disable_plane,
  48 @@ -289,6 +310,7 @@ static const struct drm_plane_funcs vc4_
  49         .reset = drm_atomic_helper_plane_reset,
  50         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
  51         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
  52 +       .format_mod_supported = vc4_fkms_format_mod_supported,
  53  };
  54
  55  static const struct drm_plane_helper_funcs vc4_primary_plane_helper_funcs = {
  56 @@ -316,6 +338,14 @@ static struct drm_plane *vc4_fkms_plane_
  57         u32 argb8888 = DRM_FORMAT_ARGB8888;
  58         int ret = 0;
  59         bool primary = (type == DRM_PLANE_TYPE_PRIMARY);
  60 +       static const uint64_t modifiers[] = {
  61 +               DRM_FORMAT_MOD_LINEAR,
  62 +               /* VC4_T_TILED should come after linear, because we
  63 +                * would prefer to scan out linear (less bus traffic).
  64 +                */
  65 +               DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED,
  66 +               DRM_FORMAT_MOD_INVALID,
  67 +       };
  68
  69         vc4_plane = devm_kzalloc(dev->dev, sizeof(*vc4_plane),
  70                                  GFP_KERNEL);
  71 @@ -327,7 +357,8 @@ static struct drm_plane *vc4_fkms_plane_
  72         plane = &vc4_plane->base;
  73         ret = drm_universal_plane_init(dev, plane, 0xff,
  74                                        &vc4_plane_funcs,
  75 -                                      primary ? &xrgb8888 : &argb8888, 1, NULL,
  76 +                                      primary ? &xrgb8888 : &argb8888, 1,
  77 +                                      modifiers,
  78                                        type, primary ? "primary" : "cursor");
  79
  80         if (type == DRM_PLANE_TYPE_PRIMARY) {