[PATCH v5 05/14] drm/exynos: dsi: add pass TE host ops to support LCD I80 interface

[YoungJun Cho]

To support LCD I80 interface, the DSI host calls this function
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 | 11 +++++++++++
 include/drm/drm_mipi_dsi.h              |  7 +++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c 
b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index dad543a..76e34ca 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -24,6 +24,7 @@
 #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 */
@@ -1041,10 +1042,20 @@ static ssize_t exynos_dsi_host_transfer(struct 
mipi_dsi_host *host,
        return (ret < 0) ? ret : xfer.rx_done;
 }

+static void exynos_dsi_host_pass_te(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)
+               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,
+       .pass_te = exynos_dsi_host_pass_te,
 };

 static int exynos_dsi_poweron(struct exynos_dsi *dsi)
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 944f33f..3f21bea 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -49,6 +49,12 @@ struct mipi_dsi_msg {
  * @detach: detach DSI device from DSI host
  * @transfer: send and/or receive DSI packet, return number of received bytes,
  *           or error
+ * @pass_te: call the crtc te_handler() callback from DSI host.
+ *          The panel generates tearing effect synchronization signal between
+ *          MCU and FB to display video images. And the display controller
+ *          should trigger to transfer video image at this signal. So the panel
+ *          receives the TE IRQ, then calls this function to notify it to the
+ *          display controller.
  */
 struct mipi_dsi_host_ops {
        int (*attach)(struct mipi_dsi_host *host,
@@ -57,6 +63,7 @@ struct mipi_dsi_host_ops {
                      struct mipi_dsi_device *dsi);
        ssize_t (*transfer)(struct mipi_dsi_host *host,
                            struct mipi_dsi_msg *msg);
+       void (*pass_te)(struct mipi_dsi_host *host);
 };

 /**
-- 
1.9.0