Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 353 insertions, 0 deletions

diff --git a/kernel/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/kernel/drivers/gpu/drm/exynos/exynos_drm_dpi.c
new file mode 100644
index 000000000..37678cf44
--- /dev/null
+++ b/kernel/drivers/gpu/drm/exynos/exynos_drm_dpi.c
@@ -0,0 +1,353 @@
+/*
+ * Exynos DRM Parallel output support.
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd
+ *
+ * Contacts: Andrzej Hajda <a.hajda@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+
+#include <linux/regulator/consumer.h>
+
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include "exynos_drm_drv.h"
+
+struct exynos_dpi {
+	struct exynos_drm_display display;
+	struct device *dev;
+	struct device_node *panel_node;
+
+	struct drm_panel *panel;
+	struct drm_connector connector;
+	struct drm_encoder *encoder;
+
+	struct videomode *vm;
+	int dpms_mode;
+};
+
+#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
+
+static inline struct exynos_dpi *display_to_dpi(struct exynos_drm_display *d)
+{
+	return container_of(d, struct exynos_dpi, display);
+}
+
+static enum drm_connector_status
+exynos_dpi_detect(struct drm_connector *connector, bool force)
+{
+	struct exynos_dpi *ctx = connector_to_dpi(connector);
+
+	if (ctx->panel && !ctx->panel->connector)
+		drm_panel_attach(ctx->panel, &ctx->connector);
+
+	return connector_status_connected;
+}
+
+static void exynos_dpi_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static struct drm_connector_funcs exynos_dpi_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.detect = exynos_dpi_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = exynos_dpi_connector_destroy,
+};
+
+static int exynos_dpi_get_modes(struct drm_connector *connector)
+{
+	struct exynos_dpi *ctx = connector_to_dpi(connector);
+
+	/* fimd timings gets precedence over panel modes */
+	if (ctx->vm) {
+		struct drm_display_mode *mode;
+
+		mode = drm_mode_create(connector->dev);
+		if (!mode) {
+			DRM_ERROR("failed to create a new display mode\n");
+			return 0;
+		}
+		drm_display_mode_from_videomode(ctx->vm, mode);
+		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+		drm_mode_probed_add(connector, mode);
+		return 1;
+	}
+
+	if (ctx->panel)
+		return ctx->panel->funcs->get_modes(ctx->panel);
+
+	return 0;
+}
+
+static struct drm_encoder *
+exynos_dpi_best_encoder(struct drm_connector *connector)
+{
+	struct exynos_dpi *ctx = connector_to_dpi(connector);
+
+	return ctx->encoder;
+}
+
+static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
+	.get_modes = exynos_dpi_get_modes,
+	.best_encoder = exynos_dpi_best_encoder,
+};
+
+static int exynos_dpi_create_connector(struct exynos_drm_display *display,
+				       struct drm_encoder *encoder)
+{
+	struct exynos_dpi *ctx = display_to_dpi(display);
+	struct drm_connector *connector = &ctx->connector;
+	int ret;
+
+	ctx->encoder = encoder;
+
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+	ret = drm_connector_init(encoder->dev, connector,
+				 &exynos_dpi_connector_funcs,
+				 DRM_MODE_CONNECTOR_VGA);
+	if (ret) {
+		DRM_ERROR("failed to initialize connector with drm\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
+	drm_connector_register(connector);
+	drm_mode_connector_attach_encoder(connector, encoder);
+
+	return 0;
+}
+
+static void exynos_dpi_poweron(struct exynos_dpi *ctx)
+{
+	if (ctx->panel) {
+		drm_panel_prepare(ctx->panel);
+		drm_panel_enable(ctx->panel);
+	}
+}
+
+static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
+{
+	if (ctx->panel) {
+		drm_panel_disable(ctx->panel);
+		drm_panel_unprepare(ctx->panel);
+	}
+}
+
+static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
+{
+	struct exynos_dpi *ctx = display_to_dpi(display);
+
+	switch (mode) {
+	case DRM_MODE_DPMS_ON:
+		if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
+				exynos_dpi_poweron(ctx);
+			break;
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
+	case DRM_MODE_DPMS_OFF:
+		if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
+			exynos_dpi_poweroff(ctx);
+		break;
+	default:
+		break;
+	}
+	ctx->dpms_mode = mode;
+}
+
+static struct exynos_drm_display_ops exynos_dpi_display_ops = {
+	.create_connector = exynos_dpi_create_connector,
+	.dpms = exynos_dpi_dpms
+};
+
+/* of_* functions will be removed after merge of of_graph patches */
+static struct device_node *
+of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
+{
+	struct device_node *np;
+
+	for_each_child_of_node(parent, np) {
+		u32 r;
+
+		if (!np->name || of_node_cmp(np->name, name))
+			continue;
+
+		if (of_property_read_u32(np, "reg", &r) < 0)
+			r = 0;
+
+		if (reg == r)
+			break;
+	}
+
+	return np;
+}
+
+static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
+						    u32 reg)
+{
+	struct device_node *ports, *port;
+
+	ports = of_get_child_by_name(parent, "ports");
+	if (ports)
+		parent = ports;
+
+	port = of_get_child_by_name_reg(parent, "port", reg);
+
+	of_node_put(ports);
+
+	return port;
+}
+
+static struct device_node *
+of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
+{
+	return of_get_child_by_name_reg(port, "endpoint", reg);
+}
+
+static struct device_node *
+of_graph_get_remote_port_parent(const struct device_node *node)
+{
+	struct device_node *np;
+	unsigned int depth;
+
+	np = of_parse_phandle(node, "remote-endpoint", 0);
+
+	/* Walk 3 levels up only if there is 'ports' node. */
+	for (depth = 3; depth && np; depth--) {
+		np = of_get_next_parent(np);
+		if (depth == 2 && of_node_cmp(np->name, "ports"))
+			break;
+	}
+	return np;
+}
+
+enum {
+	FIMD_PORT_IN0,
+	FIMD_PORT_IN1,
+	FIMD_PORT_IN2,
+	FIMD_PORT_RGB,
+	FIMD_PORT_WRB,
+};
+
+static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
+{
+	struct device_node *np, *ep;
+
+	np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
+	if (!np)
+		return NULL;
+
+	ep = of_graph_get_endpoint_by_reg(np, 0);
+	of_node_put(np);
+	if (!ep)
+		return NULL;
+
+	np = of_graph_get_remote_port_parent(ep);
+	of_node_put(ep);
+
+	return np;
+}
+
+static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
+{
+	struct device *dev = ctx->dev;
+	struct device_node *dn = dev->of_node;
+	struct device_node *np;
+
+	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
+
+	np = of_get_child_by_name(dn, "display-timings");
+	if (np) {
+		struct videomode *vm;
+		int ret;
+
+		of_node_put(np);
+
+		vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
+		if (!vm)
+			return -ENOMEM;
+
+		ret = of_get_videomode(dn, vm, 0);
+		if (ret < 0) {
+			devm_kfree(dev, vm);
+			return ret;
+		}
+
+		ctx->vm = vm;
+
+		return 0;
+	}
+
+	if (!ctx->panel_node)
+		return -EINVAL;
+
+	return 0;
+}
+
+struct exynos_drm_display *exynos_dpi_probe(struct device *dev)
+{
+	struct exynos_dpi *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	ctx->display.type = EXYNOS_DISPLAY_TYPE_LCD;
+	ctx->display.ops = &exynos_dpi_display_ops;
+	ctx->dev = dev;
+	ctx->dpms_mode = DRM_MODE_DPMS_OFF;
+
+	ret = exynos_drm_component_add(dev,
+					EXYNOS_DEVICE_TYPE_CONNECTOR,
+					ctx->display.type);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = exynos_dpi_parse_dt(ctx);
+	if (ret < 0) {
+		devm_kfree(dev, ctx);
+		goto err_del_component;
+	}
+
+	if (ctx->panel_node) {
+		ctx->panel = of_drm_find_panel(ctx->panel_node);
+		if (!ctx->panel) {
+			exynos_drm_component_del(dev,
+						EXYNOS_DEVICE_TYPE_CONNECTOR);
+			return ERR_PTR(-EPROBE_DEFER);
+		}
+	}
+
+	return &ctx->display;
+
+err_del_component:
+	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
+
+	return NULL;
+}
+
+int exynos_dpi_remove(struct exynos_drm_display *display)
+{
+	struct exynos_dpi *ctx = display_to_dpi(display);
+
+	exynos_dpi_dpms(&ctx->display, DRM_MODE_DPMS_OFF);
+
+	if (ctx->panel)
+		drm_panel_detach(ctx->panel);
+
+	exynos_drm_component_del(ctx->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
+
+	return 0;
+}