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>
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@ -536,6 +536,13 @@ static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
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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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* 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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