drm: rcar-du: Output HSYNC instead of CSYNC

The DU outputs by default a composite sync signal (XOR of the horizontal
and vertical sync signals) on the HSYNC output pin. As this can confuse
devices and isn't needed by any of the supported encoders, configure the
HSYNC pin to output the horizontal sync signal.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index ce280bd390a9ebc8a4e155e250e34858c00aae90..25b762b5876502afa2f7874ac2cb3ed5cfacc51d 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -144,7 +144,7 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
        /* Signal polarities */
        value = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : DSMR_VSL)
              | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : DSMR_HSL)
-             | DSMR_DIPM_DE;
+             | DSMR_DIPM_DE | DSMR_CSPM;
        rcar_du_crtc_write(rcrtc, DSMR, value);
 
        /* Display timings */