1 /* 2 * Exynos DRM Parallel output support. 3 * 4 * Copyright (c) 2014 Samsung Electronics Co., Ltd 5 * 6 * Contacts: Andrzej Hajda <a.hajda@samsung.com> 7 * 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. 11 */ 12 13 #include <drm/drmP.h> 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_panel.h> 16 #include <drm/drm_probe_helper.h> 17 18 #include <linux/of_graph.h> 19 #include <linux/regulator/consumer.h> 20 21 #include <video/of_videomode.h> 22 #include <video/videomode.h> 23 24 #include "exynos_drm_crtc.h" 25 26 struct exynos_dpi { 27 struct drm_encoder encoder; 28 struct device *dev; 29 struct device_node *panel_node; 30 31 struct drm_panel *panel; 32 struct drm_connector connector; 33 34 struct videomode *vm; 35 }; 36 37 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) 38 39 static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e) 40 { 41 return container_of(e, struct exynos_dpi, encoder); 42 } 43 44 static enum drm_connector_status 45 exynos_dpi_detect(struct drm_connector *connector, bool force) 46 { 47 struct exynos_dpi *ctx = connector_to_dpi(connector); 48 49 if (ctx->panel && !ctx->panel->connector) 50 drm_panel_attach(ctx->panel, &ctx->connector); 51 52 return connector_status_connected; 53 } 54 55 static void exynos_dpi_connector_destroy(struct drm_connector *connector) 56 { 57 drm_connector_unregister(connector); 58 drm_connector_cleanup(connector); 59 } 60 61 static const struct drm_connector_funcs exynos_dpi_connector_funcs = { 62 .detect = exynos_dpi_detect, 63 .fill_modes = drm_helper_probe_single_connector_modes, 64 .destroy = exynos_dpi_connector_destroy, 65 .reset = drm_atomic_helper_connector_reset, 66 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 67 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 68 }; 69 70 static int exynos_dpi_get_modes(struct drm_connector *connector) 71 { 72 struct exynos_dpi *ctx = connector_to_dpi(connector); 73 74 /* fimd timings gets precedence over panel modes */ 75 if (ctx->vm) { 76 struct drm_display_mode *mode; 77 78 mode = drm_mode_create(connector->dev); 79 if (!mode) { 80 DRM_DEV_ERROR(ctx->dev, 81 "failed to create a new display mode\n"); 82 return 0; 83 } 84 drm_display_mode_from_videomode(ctx->vm, mode); 85 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 86 drm_mode_probed_add(connector, mode); 87 return 1; 88 } 89 90 if (ctx->panel) 91 return ctx->panel->funcs->get_modes(ctx->panel); 92 93 return 0; 94 } 95 96 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { 97 .get_modes = exynos_dpi_get_modes, 98 }; 99 100 static int exynos_dpi_create_connector(struct drm_encoder *encoder) 101 { 102 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 103 struct drm_connector *connector = &ctx->connector; 104 int ret; 105 106 connector->polled = DRM_CONNECTOR_POLL_HPD; 107 108 ret = drm_connector_init(encoder->dev, connector, 109 &exynos_dpi_connector_funcs, 110 DRM_MODE_CONNECTOR_VGA); 111 if (ret) { 112 DRM_DEV_ERROR(ctx->dev, 113 "failed to initialize connector with drm\n"); 114 return ret; 115 } 116 117 drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs); 118 drm_connector_attach_encoder(connector, encoder); 119 120 return 0; 121 } 122 123 static void exynos_dpi_mode_set(struct drm_encoder *encoder, 124 struct drm_display_mode *mode, 125 struct drm_display_mode *adjusted_mode) 126 { 127 } 128 129 static void exynos_dpi_enable(struct drm_encoder *encoder) 130 { 131 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 132 133 if (ctx->panel) { 134 drm_panel_prepare(ctx->panel); 135 drm_panel_enable(ctx->panel); 136 } 137 } 138 139 static void exynos_dpi_disable(struct drm_encoder *encoder) 140 { 141 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 142 143 if (ctx->panel) { 144 drm_panel_disable(ctx->panel); 145 drm_panel_unprepare(ctx->panel); 146 } 147 } 148 149 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = { 150 .mode_set = exynos_dpi_mode_set, 151 .enable = exynos_dpi_enable, 152 .disable = exynos_dpi_disable, 153 }; 154 155 static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = { 156 .destroy = drm_encoder_cleanup, 157 }; 158 159 enum { 160 FIMD_PORT_IN0, 161 FIMD_PORT_IN1, 162 FIMD_PORT_IN2, 163 FIMD_PORT_RGB, 164 FIMD_PORT_WRB, 165 }; 166 167 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) 168 { 169 struct device *dev = ctx->dev; 170 struct device_node *dn = dev->of_node; 171 struct device_node *np; 172 173 ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0); 174 175 np = of_get_child_by_name(dn, "display-timings"); 176 if (np) { 177 struct videomode *vm; 178 int ret; 179 180 of_node_put(np); 181 182 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); 183 if (!vm) 184 return -ENOMEM; 185 186 ret = of_get_videomode(dn, vm, 0); 187 if (ret < 0) { 188 devm_kfree(dev, vm); 189 return ret; 190 } 191 192 ctx->vm = vm; 193 194 return 0; 195 } 196 197 if (!ctx->panel_node) 198 return -EINVAL; 199 200 return 0; 201 } 202 203 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder) 204 { 205 int ret; 206 207 drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs, 208 DRM_MODE_ENCODER_TMDS, NULL); 209 210 drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs); 211 212 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 213 if (ret < 0) 214 return ret; 215 216 ret = exynos_dpi_create_connector(encoder); 217 if (ret) { 218 DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev, 219 "failed to create connector ret = %d\n", ret); 220 drm_encoder_cleanup(encoder); 221 return ret; 222 } 223 224 return 0; 225 } 226 227 struct drm_encoder *exynos_dpi_probe(struct device *dev) 228 { 229 struct exynos_dpi *ctx; 230 int ret; 231 232 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 233 if (!ctx) 234 return ERR_PTR(-ENOMEM); 235 236 ctx->dev = dev; 237 238 ret = exynos_dpi_parse_dt(ctx); 239 if (ret < 0) { 240 devm_kfree(dev, ctx); 241 return NULL; 242 } 243 244 if (ctx->panel_node) { 245 ctx->panel = of_drm_find_panel(ctx->panel_node); 246 if (IS_ERR(ctx->panel)) 247 return ERR_CAST(ctx->panel); 248 } 249 250 return &ctx->encoder; 251 } 252 253 int exynos_dpi_remove(struct drm_encoder *encoder) 254 { 255 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 256 257 exynos_dpi_disable(&ctx->encoder); 258 259 if (ctx->panel) 260 drm_panel_detach(ctx->panel); 261 262 return 0; 263 } 264