[PATCH] DRM: ARC: PGU: interlaced mode not supported

[Eugeniy Paltsev]

Filter out interlaced modes as they are not supported by ARC PGU
hardware.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@xxxxxxxxxxxx>
---
 drivers/gpu/drm/arc/arcpgu_crtc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
index 8ae1e1f97a73..c854066d4c75 100644
--- a/drivers/gpu/drm/arc/arcpgu_crtc.c
+++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
@@ -67,6 +67,9 @@ static enum drm_mode_status arc_pgu_crtc_mode_valid(struct drm_crtc *crtc,
 	long rate, clk_rate = mode->clock * 1000;
 	long diff = clk_rate / 200; /* +-0.5% allowed by HDMI spec */
 
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+		return MODE_NO_INTERLACE;
+
 	rate = clk_round_rate(arcpgu->clk, clk_rate);
 	if ((max(rate, clk_rate) - min(rate, clk_rate) < diff) && (rate > 0))
 		return MODE_OK;
-- 
2.21.1