[PATCH 1/2] drm/fsl-dcu: Add HDMI driver for freescale DCU

[Meng Yi <meng.yi@nxp.com>]

This driver add the basic functions for Encoder, and link the Encoder to
appropriate DRM bridge.
This driver is depend on sii9022 driver(drm_bridge approach),which is
sent by Boris Brezillon to community but not merged.
https://patchwork.kernel.org/patch/8600921/

Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Jianwei Wang <jianwei.wang.chn@gmail.com>
Signed-off-by: Meng Yi <meng.yi@nxp.com>
---
 drivers/gpu/drm/fsl-dcu/Makefile             |   1 +
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_hdmi.c   | 194 +++++++++++++++++++++++++++
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c    |  29 ++++
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h |   4 +
 4 files changed, 228 insertions(+)
 create mode 100644 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_hdmi.c

diff --git a/drivers/gpu/drm/fsl-dcu/Makefile b/drivers/gpu/drm/fsl-dcu/Makefile
index b35a292..12e2245 100644
--- a/drivers/gpu/drm/fsl-dcu/Makefile
+++ b/drivers/gpu/drm/fsl-dcu/Makefile
@@ -1,6 +1,7 @@
 fsl-dcu-drm-y := fsl_dcu_drm_drv.o \
 		 fsl_dcu_drm_kms.o \
 		 fsl_dcu_drm_rgb.o \
+		 fsl_dcu_drm_hdmi.o \
 		 fsl_dcu_drm_plane.o \
 		 fsl_dcu_drm_crtc.o \
 		 fsl_dcu_drm_fbdev.o \
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_hdmi.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_hdmi.c
new file mode 100644
index 0000000..76441c7
--- /dev/null
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_hdmi.c
@@ -0,0 +1,194 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * Freescale DCU drm device driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/fsl_devices.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/backlight.h>
+#include <linux/of_graph.h>
+#include <video/videomode.h>
+#include <video/of_display_timing.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+
+#include "fsl_dcu_drm_drv.h"
+#include "fsl_dcu_drm_output.h"
+
+static void
+fsl_dcu_drm_hdmienc_mode_set(struct drm_encoder *encoder,
+					 struct drm_display_mode *mode,
+					 struct drm_display_mode *adjusted_mode)
+{
+}
+
+static int
+fsl_dcu_drm_hdmienc_atomic_check(struct drm_encoder *encoder,
+				 struct drm_crtc_state *crtc_state,
+				 struct drm_connector_state *conn_state)
+{
+	return 0;
+}
+
+static void
+fsl_dcu_drm_hdmienc_disable(struct drm_encoder *encoder)
+{
+}
+
+static void
+fsl_dcu_drm_hdmienc_enable(struct drm_encoder *encoder)
+{
+}
+
+static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
+	.atomic_check = fsl_dcu_drm_hdmienc_atomic_check,
+	.disable = fsl_dcu_drm_hdmienc_disable,
+	.enable = fsl_dcu_drm_hdmienc_enable,
+	.mode_set = fsl_dcu_drm_hdmienc_mode_set,
+};
+
+static void fsl_dcu_drm_hdmienc_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+}
+
+void fsl_dcu_drm_hdmienc_reset(struct drm_encoder *encoder)
+{
+}
+
+static const struct drm_encoder_funcs encoder_funcs = {
+	.reset = fsl_dcu_drm_hdmienc_reset,
+	.destroy = fsl_dcu_drm_hdmienc_destroy,
+};
+
+int fsl_dcu_drm_hdmienc_create(struct fsl_dcu_drm_device *fsl_dev,
+			       struct drm_crtc *crtc)
+{
+	struct drm_encoder *encoder;
+	int ret;
+
+	do {
+		encoder = devm_kzalloc(fsl_dev->dev,
+					sizeof(struct drm_encoder), GFP_KERNEL);
+		encoder->possible_crtcs = 1;
+		ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
+				       DRM_MODE_ENCODER_TMDS, NULL);
+		if (ret < 0) {
+			devm_kfree(fsl_dev->dev, encoder);
+			break;
+		}
+
+		drm_encoder_helper_add(encoder, &encoder_helper_funcs);
+		encoder->crtc = crtc;
+
+		return 0;
+	} while (false);
+
+	DRM_ERROR("failed to initialize hdmi encoder\n");
+	if (encoder)
+		devm_kfree(fsl_dev->dev, encoder);
+
+	crtc->funcs->destroy(crtc);
+	return ret;
+}
+
+static struct drm_encoder *fsl_dcu_drm_hdmi_find_encoder(struct drm_device *dev)
+{
+	struct drm_encoder *encoder;
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+		if (encoder->encoder_type == DRM_MODE_ENCODER_TMDS)
+			return encoder;
+	}
+
+	return NULL;
+}
+
+int fsl_dcu_drm_hdmienc_attach_bridge(struct fsl_dcu_drm_device *fsl_dev)
+{
+	struct drm_device *drm_dev = fsl_dev->drm;
+	struct drm_encoder *encoder;
+	struct drm_bridge *bridge;
+	int ret;
+	struct device_node *entity;
+	struct of_endpoint *ep;
+	struct device_node *ep_node;
+	struct device_node *parent = fsl_dev->dev->of_node;
+
+	do {
+		ep = devm_kzalloc(fsl_dev->dev,
+					sizeof(struct of_endpoint), GFP_KERNEL);
+		if (!ep)
+			break;
+
+		ep_node = devm_kzalloc(fsl_dev->dev,
+					sizeof(struct device_node), GFP_KERNEL);
+		if (!ep_node)
+			break;
+
+		ep_node = of_graph_get_next_endpoint(parent, NULL);
+		if (!ep_node)
+			break;
+
+		ret = of_graph_parse_endpoint(ep_node, ep);
+		if (ret < 0) {
+			of_node_put(ep_node);
+			break;
+		}
+
+		entity = of_graph_get_remote_port_parent(ep->local_node);
+		if (!entity)
+			break;
+
+		bridge = of_drm_find_bridge(entity);
+		if (!bridge)
+			break;
+
+		encoder = fsl_dcu_drm_hdmi_find_encoder(drm_dev);
+		if (!encoder)
+			break;
+
+		encoder->bridge = bridge;
+		bridge->encoder = encoder;
+
+		ret = drm_bridge_attach(drm_dev, bridge);
+		if (ret)
+			break;
+
+		return 0;
+	} while (false);
+
+	DRM_ERROR("failed to attach the bridge\n");
+
+	if (ep)
+		devm_kfree(fsl_dev->dev, ep);
+
+	if (ep_node)
+		devm_kfree(fsl_dev->dev, ep_node);
+
+	encoder->funcs->destroy(encoder);
+	return ret;
+}
+
+MODULE_AUTHOR("NXP Semiconductor, Inc.");
+MODULE_DESCRIPTION("NXP LS1021A DCU driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
index c564ec6..a7fe1d2 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
@@ -17,10 +17,29 @@
 #include "fsl_dcu_drm_crtc.h"
 #include "fsl_dcu_drm_drv.h"
 
+bool g_enable_hdmi;
+
+static int __init enable_hdmi_setup(char *str)
+{
+	g_enable_hdmi = true;
+
+	return 1;
+}
+
+__setup("hdmi", enable_hdmi_setup);
+
+static void fsl_dcu_drm_output_poll_changed(struct drm_device *dev)
+{
+	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
+
+	drm_fbdev_cma_hotplug_event(fsl_dev->fbdev);
+}
+
 static const struct drm_mode_config_funcs fsl_dcu_drm_mode_config_funcs = {
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 	.fb_create = drm_fb_cma_create,
+	.output_poll_changed = fsl_dcu_drm_output_poll_changed,
 };
 
 int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev)
@@ -47,6 +66,16 @@ int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev)
 	if (ret)
 		goto fail_connector;
 
+	if (g_enable_hdmi) {
+		ret = fsl_dcu_drm_hdmienc_create(fsl_dev, &fsl_dev->crtc);
+		if (ret)
+			return ret;
+
+		ret = fsl_dcu_drm_hdmienc_attach_bridge(fsl_dev);
+		if (ret)
+			return ret;
+	}
+
 	drm_mode_config_reset(fsl_dev->drm);
 	drm_kms_helper_poll_init(fsl_dev->drm);
 
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h
index 7093109..8915b07 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h
@@ -29,5 +29,9 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 				 struct drm_encoder *encoder);
 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
 			       struct drm_crtc *crtc);
+int fsl_dcu_drm_hdmienc_attach_bridge(struct fsl_dcu_drm_device *fsl_dev);
+int fsl_dcu_drm_hdmienc_create(struct fsl_dcu_drm_device *fsl_dev,
+			       struct drm_crtc *crtc);
+
 
 #endif /* __FSL_DCU_DRM_CONNECTOR_H__ */
-- 
2.1.0.27.g96db324

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