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From 39d618a032d26655dfa62299034394e5d1ea7712 Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@gmail.com>
Date: Tue, 19 Jul 2016 20:58:59 +0200
Subject: [PATCH] drm/vc4: Reject doublescan modes.
We can't handle doublescan modes at the moment, so if
userspace tries to set one, reject the mode set.
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/vc4/vc4_crtc.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -542,6 +542,13 @@ static bool vc4_crtc_mode_fixup(struct d
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
+ /* Do not allow doublescan modes from user space */
+ if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) {
+ DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
+ crtc->base.id);
+ return false;
+ }
+
/*
* Interlaced video modes got CRTC_INTERLACE_HALVE_V applied when
* coming from user space. We don't want this, as it screws up
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