[RFC v3 PATCH 07/16] drm/exynos: dsi: add TE handler to support command mode interface

[YoungJun Cho]

To support command mode interface, the DSI host calls this handler
to notify the panel tearing effect synchronization signal to the
CRTC device manager to trigger to transfer video image.

Signed-off-by: YoungJun Cho <yj44.cho at samsung.com>
Acked-by: Inki Dae <inki.dae at samsung.com>
Acked-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 956e5f3..4a918ec 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -23,6 +23,7 @@
 #include <video/mipi_display.h>
 #include <video/videomode.h>
 
+#include "exynos_drm_crtc.h"
 #include "exynos_drm_drv.h"
 
 /* returns true iff both arguments logically differs */
@@ -1032,10 +1033,22 @@ static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host,
 	return (ret < 0) ? ret : xfer.rx_done;
 }
 
+static int exynos_dsi_host_te_handler(struct mipi_dsi_host *host)
+{
+	struct exynos_dsi *dsi = host_to_dsi(host);
+	struct drm_encoder *encoder = dsi->encoder;
+
+	if (!(dsi->state & DSIM_STATE_ENABLED))
+		return -EPERM;
+
+	return exynos_drm_crtc_te_handler(encoder->crtc);
+}
+
 static const struct mipi_dsi_host_ops exynos_dsi_ops = {
 	.attach = exynos_dsi_host_attach,
 	.detach = exynos_dsi_host_detach,
 	.transfer = exynos_dsi_host_transfer,
+	.te_handler = exynos_dsi_host_te_handler,
 };
 
 static int exynos_dsi_poweron(struct exynos_dsi *dsi)
-- 
1.7.9.5