From mboxrd@z Thu Jan  1 00:00:00 1970
From: YoungJun Cho <yj44.cho@samsung.com>
Subject: [PATCH v5 05/14] drm/exynos: dsi: add pass TE host ops to support LCD
 I80 interface
Date: Tue, 08 Jul 2014 09:39:38 +0900
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Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, sw0312.kim@samsung.com, a.hajda@samsung.com, kyungmin.park@samsung.com, robh+dt@kernel.org, galak@codeaurora.org, kgene.kim@samsung.com
List-Id: devicetree@vger.kernel.org

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@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@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