target/linux/bcm27xx/patches-5.15/950-0904-drm-vc4-drv-Skip-BO-Backend-Initialization-on-BCM271.patch

   1 From 37f9fb928b7f32f4ee16cbd494aa15f146b20a65 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Thu, 21 Apr 2022 17:29:02 +0200
   4 Subject: [PATCH] drm/vc4: drv: Skip BO Backend Initialization on
   5  BCM2711
   6
   7 On the BCM2711, we currently call the vc4_bo_cache_init() and
   8 vc4_gem_init() functions. These functions initialize the BO and GEM
   9 backends.
  10
  11 However, this code was initially created to accomodate the requirements
  12 of the GPU on the older SoCs, while the BCM2711 has a separate driver
  13 for it. So let's just skip these calls when we're on a newer hardware.
  14
  15 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  16 ---
  17  drivers/gpu/drm/vc4/vc4_drv.c | 18 +++++++++++-------
  18  1 file changed, 11 insertions(+), 7 deletions(-)
  19
  20 --- a/drivers/gpu/drm/vc4/vc4_drv.c
  21 +++ b/drivers/gpu/drm/vc4/vc4_drv.c
  22 @@ -325,19 +325,23 @@ static int vc4_drm_bind(struct device *d
  23         platform_set_drvdata(pdev, drm);
  24         INIT_LIST_HEAD(&vc4->debugfs_list);
  25
  26 -       mutex_init(&vc4->bin_bo_lock);
  27 +       if (!is_vc5) {
  28 +               mutex_init(&vc4->bin_bo_lock);
  29
  30 -       ret = vc4_bo_cache_init(drm);
  31 -       if (ret)
  32 -               return ret;
  33 +               ret = vc4_bo_cache_init(drm);
  34 +               if (ret)
  35 +                       return ret;
  36 +       }
  37
  38         ret = drmm_mode_config_init(drm);
  39         if (ret)
  40                 return ret;
  41
  42 -       ret = vc4_gem_init(drm);
  43 -       if (ret)
  44 -               return ret;
  45 +       if (!is_vc5) {
  46 +               ret = vc4_gem_init(drm);
  47 +               if (ret)
  48 +                       return ret;
  49 +       }
  50
  51         node = of_find_compatible_node(NULL, NULL, "raspberrypi,bcm2835-firmware");
  52         if (node) {