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_ERROR("failed to create a new display mode\n"); 81 return 0; 82 } 83 drm_display_mode_from_videomode(ctx->vm, mode); 84 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 85 drm_mode_probed_add(connector, mode); 86 return 1; 87 } 88 89 if (ctx->panel) 90 return ctx->panel->funcs->get_modes(ctx->panel); 91 92 return 0; 93 } 94 95 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { 96 .get_modes = exynos_dpi_get_modes, 97 }; 98 99 static int exynos_dpi_create_connector(struct drm_encoder *encoder) 100 { 101 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 102 struct drm_connector *connector = &ctx->connector; 103 int ret; 104 105 connector->polled = DRM_CONNECTOR_POLL_HPD; 106 107 ret = drm_connector_init(encoder->dev, connector, 108 &exynos_dpi_connector_funcs, 109 DRM_MODE_CONNECTOR_VGA); 110 if (ret) { 111 DRM_ERROR("failed to initialize connector with drm\n"); 112 return ret; 113 } 114 115 drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs); 116 drm_connector_attach_encoder(connector, encoder); 117 118 return 0; 119 } 120 121 static void exynos_dpi_mode_set(struct drm_encoder *encoder, 122 struct drm_display_mode *mode, 123 struct drm_display_mode *adjusted_mode) 124 { 125 } 126 127 static void exynos_dpi_enable(struct drm_encoder *encoder) 128 { 129 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 130 131 if (ctx->panel) { 132 drm_panel_prepare(ctx->panel); 133 drm_panel_enable(ctx->panel); 134 } 135 } 136 137 static void exynos_dpi_disable(struct drm_encoder *encoder) 138 { 139 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 140 141 if (ctx->panel) { 142 drm_panel_disable(ctx->panel); 143 drm_panel_unprepare(ctx->panel); 144 } 145 } 146 147 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = { 148 .mode_set = exynos_dpi_mode_set, 149 .enable = exynos_dpi_enable, 150 .disable = exynos_dpi_disable, 151 }; 152 153 static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = { 154 .destroy = drm_encoder_cleanup, 155 }; 156 157 enum { 158 FIMD_PORT_IN0, 159 FIMD_PORT_IN1, 160 FIMD_PORT_IN2, 161 FIMD_PORT_RGB, 162 FIMD_PORT_WRB, 163 }; 164 165 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) 166 { 167 struct device *dev = ctx->dev; 168 struct device_node *dn = dev->of_node; 169 struct device_node *np; 170 171 ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0); 172 173 np = of_get_child_by_name(dn, "display-timings"); 174 if (np) { 175 struct videomode *vm; 176 int ret; 177 178 of_node_put(np); 179 180 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); 181 if (!vm) 182 return -ENOMEM; 183 184 ret = of_get_videomode(dn, vm, 0); 185 if (ret < 0) { 186 devm_kfree(dev, vm); 187 return ret; 188 } 189 190 ctx->vm = vm; 191 192 return 0; 193 } 194 195 if (!ctx->panel_node) 196 return -EINVAL; 197 198 return 0; 199 } 200 201 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder) 202 { 203 int ret; 204 205 drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs, 206 DRM_MODE_ENCODER_TMDS, NULL); 207 208 drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs); 209 210 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 211 if (ret < 0) 212 return ret; 213 214 ret = exynos_dpi_create_connector(encoder); 215 if (ret) { 216 DRM_ERROR("failed to create connector ret = %d\n", ret); 217 drm_encoder_cleanup(encoder); 218 return ret; 219 } 220 221 return 0; 222 } 223 224 struct drm_encoder *exynos_dpi_probe(struct device *dev) 225 { 226 struct exynos_dpi *ctx; 227 int ret; 228 229 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 230 if (!ctx) 231 return ERR_PTR(-ENOMEM); 232 233 ctx->dev = dev; 234 235 ret = exynos_dpi_parse_dt(ctx); 236 if (ret < 0) { 237 devm_kfree(dev, ctx); 238 return NULL; 239 } 240 241 if (ctx->panel_node) { 242 ctx->panel = of_drm_find_panel(ctx->panel_node); 243 if (IS_ERR(ctx->panel)) 244 return ERR_CAST(ctx->panel); 245 } 246 247 return &ctx->encoder; 248 } 249 250 int exynos_dpi_remove(struct drm_encoder *encoder) 251 { 252 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 253 254 exynos_dpi_disable(&ctx->encoder); 255 256 if (ctx->panel) 257 drm_panel_detach(ctx->panel); 258 259 return 0; 260 } 261