drm/vc4: Disallow interlaced modes on DPI.

We already don't expose such modes to userspace, but make
sure userspace can't sneak some interlaced mode in.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
index 275fedbdbd9e..1e1f6b8184d0 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -340,9 +340,20 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
         }
 }
 
+static bool vc4_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
+                                       const struct drm_display_mode *mode,
+                                       struct drm_display_mode *adjusted_mode)
+{
+        if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
+                return false;
+
+        return true;
+}
+
 static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
         .disable = vc4_dpi_encoder_disable,
         .enable = vc4_dpi_encoder_enable,
+        .mode_fixup = vc4_dpi_encoder_mode_fixup,
 };
 
 static const struct of_device_id vc4_dpi_dt_match[] = {