2017-02-06 16:12:09 +00:00
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From 39d618a032d26655dfa62299034394e5d1ea7712 Mon Sep 17 00:00:00 2001
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2016-12-02 10:50:26 +00:00
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From: Mario Kleiner <mario.kleiner.de@gmail.com>
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Date: Tue, 19 Jul 2016 20:58:59 +0200
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Subject: [PATCH] drm/vc4: Reject doublescan modes.
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We can't handle doublescan modes at the moment, so if
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userspace tries to set one, reject the mode set.
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Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 7 +++++++
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1 file changed, 7 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_crtc.c
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+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
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@@ -542,6 +542,13 @@ static bool vc4_crtc_mode_fixup(struct d
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const struct drm_display_mode *mode,
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struct drm_display_mode *adjusted_mode)
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{
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+ /* Do not allow doublescan modes from user space */
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+ if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) {
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+ DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
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+ crtc->base.id);
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+ return false;
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+ }
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+
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/*
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* Interlaced video modes got CRTC_INTERLACE_HALVE_V applied when
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* coming from user space. We don't want this, as it screws up
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