drm: rcar-du: Reject modes that fail CRTC timing requirements

The hardware requires the HDSR and VDSR registers to be set to 1 or
higher. This translates to a minimum combined horizontal sync and back
porch of 20 pixels and a minimum vertical back porch of 3 lines. Reject
modes that fail those requirements.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 79021d7aa3ce..90dacab67be5 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -735,10 +735,22 @@ enum drm_mode_status rcar_du_crtc_mode_valid(struct drm_crtc *crtc,
         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
         struct rcar_du_device *rcdu = rcrtc->group->dev;
         bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
+        unsigned int vbp;
 
         if (interlaced && !rcar_du_has(rcdu, RCAR_DU_FEATURE_INTERLACED))
                 return MODE_NO_INTERLACE;
 
+        /*
+         * The hardware requires a minimum combined horizontal sync and back
+         * porch of 20 pixels and a minimum vertical back porch of 3 lines.
+         */
+        if (mode->htotal - mode->hsync_start < 20)
+                return MODE_HBLANK_NARROW;
+
+        vbp = (mode->vtotal - mode->vsync_end) / (interlaced ? 2 : 1);
+        if (vbp < 3)
+                return MODE_VBLANK_NARROW;
+
         return MODE_OK;
 }