--- /dev/null
+/*
+ * 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 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 enum drm_connector_status
+exynos_dpi_detect(struct drm_connector *connector, bool force)
+{
+ struct exynos_dpi *ctx = connector_to_dpi(connector);
+
+ /* panels supported only by boot-loader are always connected */
+ if (!ctx->panel_node)
+ return connector_status_connected;
+
+ if (!ctx->panel) {
+ ctx->panel = of_drm_find_panel(ctx->panel_node);
+ if (ctx->panel)
+ drm_panel_attach(ctx->panel, &ctx->connector);
+ }
+
+ if (ctx->panel)
+ return connector_status_connected;
+
+ return connector_status_disconnected;
+}
+
+static void exynos_dpi_connector_destroy(struct drm_connector *connector)
+{
+ drm_sysfs_connector_remove(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 int exynos_dpi_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ return MODE_OK;
+}
+
+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,
+ .mode_valid = exynos_dpi_mode_valid,
+ .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->ctx;
+ struct drm_connector *connector = &ctx->connector;
+ int ret;
+
+ ctx->encoder = encoder;
+
+ if (ctx->panel_node)
+ connector->polled = DRM_CONNECTOR_POLL_CONNECT;
+ else
+ 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_sysfs_connector_add(connector);
+ drm_mode_connector_attach_encoder(connector, encoder);
+
+ return 0;
+}
+
+static void exynos_dpi_poweron(struct exynos_dpi *ctx)
+{
+ if (ctx->panel)
+ drm_panel_enable(ctx->panel);
+}
+
+static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
+{
+ if (ctx->panel)
+ drm_panel_disable(ctx->panel);
+}
+
+static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
+{
+ struct exynos_dpi *ctx = display->ctx;
+
+ 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
+};
+
+static struct exynos_drm_display exynos_dpi_display = {
+ .type = EXYNOS_DISPLAY_TYPE_LCD,
+ .ops = &exynos_dpi_display_ops,
+};
+
+/* 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)
+ return ret;
+
+ ctx->vm = vm;
+
+ return 0;
+ }
+
+ if (!ctx->panel_node)
+ return -EINVAL;
+
+ return 0;
+}
+
+int exynos_dpi_probe(struct device *dev)
+{
+ struct exynos_dpi *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->dev = dev;
+ exynos_dpi_display.ctx = ctx;
+ ctx->dpms_mode = DRM_MODE_DPMS_OFF;
+
+ ret = exynos_dpi_parse_dt(ctx);
+ if (ret < 0)
+ return ret;
+
+ exynos_drm_display_register(&exynos_dpi_display);
+
+ return 0;
+}
+
+int exynos_dpi_remove(struct device *dev)
+{
+ exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF);
+ exynos_drm_display_unregister(&exynos_dpi_display);
+
+ return 0;
+}
projects / platform / kernel / linux-exynos.git / commitdiff