target/linux/brcm2708/patches-4.4/0517-drm-vc4-Reject-doublescan-modes.patch

   1 From 30f69de2c6e1dedc4d071a24a0690e81118421d9 Mon Sep 17 00:00:00 2001
   2 From: Mario Kleiner <mario.kleiner.de@gmail.com>
   3 Date: Tue, 19 Jul 2016 20:58:59 +0200
   4 Subject: [PATCH] drm/vc4: Reject doublescan modes.
   5
   6 We can't handle doublescan modes at the moment, so if
   7 userspace tries to set one, reject the mode set.
   8
   9 Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
  10 Signed-off-by: Eric Anholt <eric@anholt.net>
  11 ---
  12  drivers/gpu/drm/vc4/vc4_crtc.c | 7 +++++++
  13  1 file changed, 7 insertions(+)
  14
  15 --- a/drivers/gpu/drm/vc4/vc4_crtc.c
  16 +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
  17 @@ -542,6 +542,13 @@ static bool vc4_crtc_mode_fixup(struct d
  18                                 const struct drm_display_mode *mode,
  19                                 struct drm_display_mode *adjusted_mode)
  20  {
  21 +       /* Do not allow doublescan modes from user space */
  22 +       if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) {
  23 +               DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
  24 +                             crtc->base.id);
  25 +               return false;
  26 +       }
  27 +
  28         /*
  29          * Interlaced video modes got CRTC_INTERLACE_HALVE_V applied when
  30          * coming from user space. We don't want this, as it screws up