target/linux/bcm27xx/patches-4.19/950-0513-drm-vc4-Fix-synchronization-firmwarekms-against-GL-r.patch

   1 From b0fedd829bb6725fef7b2667c85badc6b4a8e5e0 Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Thu, 28 Mar 2019 11:58:51 -0700
   4 Subject: [PATCH] drm/vc4: Fix synchronization firmwarekms against GL
   5  rendering.
   6
   7 We would present the framebuffer immediately without waiting for
   8 rendering to finish first, resulting in stuttering and flickering as a
   9 window was dragged around when the GPU was busy enough to not just win
  10 the race.
  11
  12 Signed-off-by: Eric Anholt <eric@anholt.net>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 5 +++--
  15  1 file changed, 3 insertions(+), 2 deletions(-)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  19 @@ -15,6 +15,7 @@
  20   */
  21
  22  #include "drm/drm_atomic_helper.h"
  23 +#include "drm/drm_gem_framebuffer_helper.h"
  24  #include "drm/drm_plane_helper.h"
  25  #include "drm/drm_crtc_helper.h"
  26  #include "drm/drm_fourcc.h"
  27 @@ -291,7 +292,7 @@ static const struct drm_plane_funcs vc4_
  28  };
  29
  30  static const struct drm_plane_helper_funcs vc4_primary_plane_helper_funcs = {
  31 -       .prepare_fb = NULL,
  32 +       .prepare_fb = drm_gem_fb_prepare_fb,
  33         .cleanup_fb = NULL,
  34         .atomic_check = vc4_plane_atomic_check,
  35         .atomic_update = vc4_primary_plane_atomic_update,
  36 @@ -299,7 +300,7 @@ static const struct drm_plane_helper_fun
  37  };
  38
  39  static const struct drm_plane_helper_funcs vc4_cursor_plane_helper_funcs = {
  40 -       .prepare_fb = NULL,
  41 +       .prepare_fb = drm_gem_fb_prepare_fb,
  42         .cleanup_fb = NULL,
  43         .atomic_check = vc4_plane_atomic_check,
  44         .atomic_update = vc4_cursor_plane_atomic_update,