2 * Exynos DRM Parallel output support.
4 * Copyright (c) 2014 Samsung Electronics Co., Ltd
6 * Contacts: Andrzej Hajda <a.hajda@samsung.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <drm/drm_crtc_helper.h>
15 #include <drm/drm_panel.h>
16 #include <drm/drm_atomic_helper.h>
18 #include <linux/regulator/consumer.h>
20 #include <video/of_videomode.h>
21 #include <video/videomode.h>
23 #include "exynos_drm_drv.h"
26 struct exynos_drm_display display;
28 struct device_node *panel_node;
30 struct drm_panel *panel;
31 struct drm_connector connector;
32 struct drm_encoder *encoder;
38 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
40 static inline struct exynos_dpi *display_to_dpi(struct exynos_drm_display *d)
42 return container_of(d, struct exynos_dpi, display);
45 static enum drm_connector_status
46 exynos_dpi_detect(struct drm_connector *connector, bool force)
48 struct exynos_dpi *ctx = connector_to_dpi(connector);
50 if (ctx->panel && !ctx->panel->connector)
51 drm_panel_attach(ctx->panel, &ctx->connector);
53 return connector_status_connected;
56 static void exynos_dpi_connector_destroy(struct drm_connector *connector)
58 drm_connector_unregister(connector);
59 drm_connector_cleanup(connector);
62 static struct drm_connector_funcs exynos_dpi_connector_funcs = {
63 .dpms = drm_atomic_helper_connector_dpms,
64 .detect = exynos_dpi_detect,
65 .fill_modes = drm_helper_probe_single_connector_modes,
66 .destroy = exynos_dpi_connector_destroy,
67 .reset = drm_atomic_helper_connector_reset,
68 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
69 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
72 static int exynos_dpi_get_modes(struct drm_connector *connector)
74 struct exynos_dpi *ctx = connector_to_dpi(connector);
76 /* fimd timings gets precedence over panel modes */
78 struct drm_display_mode *mode;
80 mode = drm_mode_create(connector->dev);
82 DRM_ERROR("failed to create a new display mode\n");
85 drm_display_mode_from_videomode(ctx->vm, mode);
86 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
87 drm_mode_probed_add(connector, mode);
92 return ctx->panel->funcs->get_modes(ctx->panel);
97 static struct drm_encoder *
98 exynos_dpi_best_encoder(struct drm_connector *connector)
100 struct exynos_dpi *ctx = connector_to_dpi(connector);
105 static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
106 .get_modes = exynos_dpi_get_modes,
107 .best_encoder = exynos_dpi_best_encoder,
110 static int exynos_dpi_create_connector(struct exynos_drm_display *display,
111 struct drm_encoder *encoder)
113 struct exynos_dpi *ctx = display_to_dpi(display);
114 struct drm_connector *connector = &ctx->connector;
117 ctx->encoder = encoder;
119 connector->polled = DRM_CONNECTOR_POLL_HPD;
121 ret = drm_connector_init(encoder->dev, connector,
122 &exynos_dpi_connector_funcs,
123 DRM_MODE_CONNECTOR_VGA);
125 DRM_ERROR("failed to initialize connector with drm\n");
129 drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
130 drm_connector_register(connector);
131 drm_mode_connector_attach_encoder(connector, encoder);
136 static void exynos_dpi_poweron(struct exynos_dpi *ctx)
139 drm_panel_prepare(ctx->panel);
140 drm_panel_enable(ctx->panel);
144 static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
147 drm_panel_disable(ctx->panel);
148 drm_panel_unprepare(ctx->panel);
152 static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
154 struct exynos_dpi *ctx = display_to_dpi(display);
157 case DRM_MODE_DPMS_ON:
158 if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
159 exynos_dpi_poweron(ctx);
161 case DRM_MODE_DPMS_STANDBY:
162 case DRM_MODE_DPMS_SUSPEND:
163 case DRM_MODE_DPMS_OFF:
164 if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
165 exynos_dpi_poweroff(ctx);
170 ctx->dpms_mode = mode;
173 static struct exynos_drm_display_ops exynos_dpi_display_ops = {
174 .create_connector = exynos_dpi_create_connector,
175 .dpms = exynos_dpi_dpms
178 /* of_* functions will be removed after merge of of_graph patches */
179 static struct device_node *
180 of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
182 struct device_node *np;
184 for_each_child_of_node(parent, np) {
187 if (!np->name || of_node_cmp(np->name, name))
190 if (of_property_read_u32(np, "reg", &r) < 0)
200 static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
203 struct device_node *ports, *port;
205 ports = of_get_child_by_name(parent, "ports");
209 port = of_get_child_by_name_reg(parent, "port", reg);
216 static struct device_node *
217 of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
219 return of_get_child_by_name_reg(port, "endpoint", reg);
222 static struct device_node *
223 of_graph_get_remote_port_parent(const struct device_node *node)
225 struct device_node *np;
228 np = of_parse_phandle(node, "remote-endpoint", 0);
230 /* Walk 3 levels up only if there is 'ports' node. */
231 for (depth = 3; depth && np; depth--) {
232 np = of_get_next_parent(np);
233 if (depth == 2 && of_node_cmp(np->name, "ports"))
247 static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
249 struct device_node *np, *ep;
251 np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
255 ep = of_graph_get_endpoint_by_reg(np, 0);
260 np = of_graph_get_remote_port_parent(ep);
266 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
268 struct device *dev = ctx->dev;
269 struct device_node *dn = dev->of_node;
270 struct device_node *np;
272 ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
274 np = of_get_child_by_name(dn, "display-timings");
276 struct videomode *vm;
281 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
285 ret = of_get_videomode(dn, vm, 0);
296 if (!ctx->panel_node)
302 struct exynos_drm_display *exynos_dpi_probe(struct device *dev)
304 struct exynos_dpi *ctx;
307 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
309 return ERR_PTR(-ENOMEM);
311 ctx->display.type = EXYNOS_DISPLAY_TYPE_LCD;
312 ctx->display.ops = &exynos_dpi_display_ops;
314 ctx->dpms_mode = DRM_MODE_DPMS_OFF;
316 ret = exynos_drm_component_add(dev,
317 EXYNOS_DEVICE_TYPE_CONNECTOR,
322 ret = exynos_dpi_parse_dt(ctx);
324 devm_kfree(dev, ctx);
325 goto err_del_component;
328 if (ctx->panel_node) {
329 ctx->panel = of_drm_find_panel(ctx->panel_node);
331 exynos_drm_component_del(dev,
332 EXYNOS_DEVICE_TYPE_CONNECTOR);
333 return ERR_PTR(-EPROBE_DEFER);
337 return &ctx->display;
340 exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
345 int exynos_dpi_remove(struct exynos_drm_display *display)
347 struct exynos_dpi *ctx = display_to_dpi(display);
349 exynos_dpi_dpms(&ctx->display, DRM_MODE_DPMS_OFF);
352 drm_panel_detach(ctx->panel);
354 exynos_drm_component_del(ctx->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);