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drm/vc4: Reject doublescan modes.

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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>
This commit is contained in:
Mario Kleiner 2016-07-19 20:58:59 +02:00 committed by Eric Anholt
parent acc1be1d35
commit 3645146706
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/vc4/vc4_crtc.c
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@ -536,6 +536,13 @@ static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
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