target/linux/bcm27xx/patches-5.4/950-0245-drm-vc4-Bring-fkms-into-line-with-kms-in-blocking-do.patch

   1 From 9185a16ce8804d35339402c6aec38a528cc2c7a1 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Wed, 10 Apr 2019 17:43:57 +0100
   4 Subject: [PATCH] drm: vc4: Bring fkms into line with kms in blocking
   5  doublescan modes
   6
   7 Implement vc4_crtc_mode_valid so that it blocks doublescan modes
   8
   9 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  10 ---
  11  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 15 +++++++++++++--
  12  1 file changed, 13 insertions(+), 2 deletions(-)
  13
  14 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  15 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  16 @@ -627,7 +627,17 @@ static void vc4_crtc_enable(struct drm_c
  17                         vc4_plane_set_blank(plane, plane->state->visible);
  18  }
  19
  20 +static enum drm_mode_status
  21 +vc4_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
  22 +{
  23 +       /* Do not allow doublescan modes from user space */
  24 +       if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
  25 +               DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
  26 +                             crtc->base.id);
  27 +               return MODE_NO_DBLESCAN;
  28 +       }
  29
  30 +       return MODE_OK;
  31  }
  32
  33  static int vc4_crtc_atomic_check(struct drm_crtc *crtc,
  34 @@ -737,10 +747,11 @@ static const struct drm_crtc_funcs vc4_c
  35
  36  static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
  37         .mode_set_nofb = vc4_crtc_mode_set_nofb,
  38 -       .atomic_disable = vc4_crtc_disable,
  39 -       .atomic_enable = vc4_crtc_enable,
  40 +       .mode_valid = vc4_crtc_mode_valid,
  41         .atomic_check = vc4_crtc_atomic_check,
  42         .atomic_flush = vc4_crtc_atomic_flush,
  43 +       .atomic_enable = vc4_crtc_enable,
  44 +       .atomic_disable = vc4_crtc_disable,
  45  };
  46
  47  static const struct of_device_id vc4_firmware_kms_dt_match[] = {