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