1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
new file mode 100644
index 000000000000..468498e3fec1
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -0,0 +1,311 @@
+/*
+ * Samsung SoC DP (Display Port) interface driver.
+ *
+ * Copyright (C) 2012 Samsung Electronics Co., Ltd.
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ *
+ * 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/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/of_graph.h>
+#include <linux/component.h>
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+
+#include <drm/bridge/analogix_dp.h>
+#include <drm/exynos_drm.h>
+
+#include "exynos_drm_crtc.h"
+
+#define to_dp(nm)	container_of(nm, struct exynos_dp_device, nm)
+
+struct exynos_dp_device {
+	struct drm_encoder         encoder;
+	struct drm_connector       connector;
+	struct drm_bridge          *ptn_bridge;
+	struct drm_device          *drm_dev;
+	struct device              *dev;
+
+	struct videomode           vm;
+	struct analogix_dp_plat_data plat_data;
+};
+
+int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
+				bool enable)
+{
+	struct exynos_dp_device *dp = to_dp(plat_data);
+	struct drm_encoder *encoder = &dp->encoder;
+
+	if (!encoder->crtc)
+		return -EPERM;
+
+	exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
+
+	return 0;
+}
+
+static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
+{
+	return exynos_dp_crtc_clock_enable(plat_data, true);
+}
+
+static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
+{
+	return exynos_dp_crtc_clock_enable(plat_data, false);
+}
+
+static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data)
+{
+	struct exynos_dp_device *dp = to_dp(plat_data);
+	struct drm_connector *connector = &dp->connector;
+	struct drm_display_mode *mode;
+	int num_modes = 0;
+
+	if (dp->plat_data.panel)
+		return num_modes;
+
+	mode = drm_mode_create(connector->dev);
+	if (!mode) {
+		DRM_ERROR("failed to create a new display mode.\n");
+		return num_modes;
+	}
+
+	drm_display_mode_from_videomode(&dp->vm, mode);
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_set_name(mode);
+	drm_mode_probed_add(connector, mode);
+
+	return num_modes + 1;
+}
+
+static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
+				   struct drm_bridge *bridge,
+				   struct drm_connector *connector)
+{
+	struct exynos_dp_device *dp = to_dp(plat_data);
+	struct drm_encoder *encoder = &dp->encoder;
+	int ret;
+
+	drm_connector_register(connector);
+
+	/* Pre-empt DP connector creation if there's a bridge */
+	if (dp->ptn_bridge) {
+		bridge->next = dp->ptn_bridge;
+		dp->ptn_bridge->encoder = encoder;
+		ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge);
+		if (ret) {
+			DRM_ERROR("Failed to attach bridge to drm\n");
+			bridge->next = NULL;
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static void exynos_dp_mode_set(struct drm_encoder *encoder,
+			       struct drm_display_mode *mode,
+			       struct drm_display_mode *adjusted_mode)
+{
+}
+
+static void exynos_dp_nop(struct drm_encoder *encoder)
+{
+	/* do nothing */
+}
+
+static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
+	.mode_set = exynos_dp_mode_set,
+	.enable = exynos_dp_nop,
+	.disable = exynos_dp_nop,
+};
+
+static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
+{
+	int ret;
+
+	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
+	if (ret) {
+		DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
+{
+	struct exynos_dp_device *dp = dev_get_drvdata(dev);
+	struct drm_encoder *encoder = &dp->encoder;
+	struct drm_device *drm_dev = data;
+	int pipe, ret;
+
+	/*
+	 * Just like the probe function said, we don't need the
+	 * device drvrate anymore, we should leave the charge to
+	 * analogix dp driver, set the device drvdata to NULL.
+	 */
+	dev_set_drvdata(dev, NULL);
+
+	dp->dev = dev;
+	dp->drm_dev = drm_dev;
+
+	dp->plat_data.dev_type = EXYNOS_DP;
+	dp->plat_data.power_on = exynos_dp_poweron;
+	dp->plat_data.power_off = exynos_dp_poweroff;
+	dp->plat_data.attach = exynos_dp_bridge_attach;
+	dp->plat_data.get_modes = exynos_dp_get_modes;
+
+	if (!dp->plat_data.panel && !dp->ptn_bridge) {
+		ret = exynos_dp_dt_parse_panel(dp);
+		if (ret)
+			return ret;
+	}
+
+	pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
+						  EXYNOS_DISPLAY_TYPE_LCD);
+	if (pipe < 0)
+		return pipe;
+
+	encoder->possible_crtcs = 1 << pipe;
+
+	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
+
+	drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
+			 DRM_MODE_ENCODER_TMDS, NULL);
+
+	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
+
+	dp->plat_data.encoder = encoder;
+
+	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+}
+
+static void exynos_dp_unbind(struct device *dev, struct device *master,
+			     void *data)
+{
+	return analogix_dp_unbind(dev, master, data);
+}
+
+static const struct component_ops exynos_dp_ops = {
+	.bind	= exynos_dp_bind,
+	.unbind	= exynos_dp_unbind,
+};
+
+static int exynos_dp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = NULL, *endpoint = NULL;
+	struct exynos_dp_device *dp;
+
+	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
+			  GFP_KERNEL);
+	if (!dp)
+		return -ENOMEM;
+
+	/*
+	 * We just use the drvdata until driver run into component
+	 * add function, and then we would set drvdata to null, so
+	 * that analogix dp driver would take charge of the drvdata.
+	 */
+	platform_set_drvdata(pdev, dp);
+
+	/* This is for the backward compatibility. */
+	np = of_parse_phandle(dev->of_node, "panel", 0);
+	if (np) {
+		dp->plat_data.panel = of_drm_find_panel(np);
+		of_node_put(np);
+		if (!dp->plat_data.panel)
+			return -EPROBE_DEFER;
+		goto out;
+	}
+
+	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+	if (endpoint) {
+		np = of_graph_get_remote_port_parent(endpoint);
+		if (np) {
+			/* The remote port can be either a panel or a bridge */
+			dp->plat_data.panel = of_drm_find_panel(np);
+			if (!dp->plat_data.panel) {
+				dp->ptn_bridge = of_drm_find_bridge(np);
+				if (!dp->ptn_bridge) {
+					of_node_put(np);
+					return -EPROBE_DEFER;
+				}
+			}
+			of_node_put(np);
+		} else {
+			DRM_ERROR("no remote endpoint device node found.\n");
+			return -EINVAL;
+		}
+	} else {
+		DRM_ERROR("no port endpoint subnode found.\n");
+		return -EINVAL;
+	}
+
+out:
+	return component_add(&pdev->dev, &exynos_dp_ops);
+}
+
+static int exynos_dp_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &exynos_dp_ops);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int exynos_dp_suspend(struct device *dev)
+{
+	return analogix_dp_suspend(dev);
+}
+
+static int exynos_dp_resume(struct device *dev)
+{
+	return analogix_dp_resume(dev);
+}
+#endif
+
+static const struct dev_pm_ops exynos_dp_pm_ops = {
+	SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
+};
+
+static const struct of_device_id exynos_dp_match[] = {
+	{ .compatible = "samsung,exynos5-dp" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_dp_match);
+
+struct platform_driver dp_driver = {
+	.probe		= exynos_dp_probe,
+	.remove		= exynos_dp_remove,
+	.driver		= {
+		.name	= "exynos-dp",
+		.owner	= THIS_MODULE,
+		.pm	= &exynos_dp_pm_ops,
+		.of_match_table = exynos_dp_match,
+	},
+};
+
+MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
+MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
+MODULE_LICENSE("GPL v2");