1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Exynos DRM Parallel output support. 4 * 5 * Copyright (c) 2014 Samsung Electronics Co., Ltd 6 * 7 * Contacts: Andrzej Hajda <a.hajda@samsung.com> 8 */ 9 10 #include <linux/of_graph.h> 11 #include <linux/regulator/consumer.h> 12 13 #include <drm/drm_atomic_helper.h> 14 #include <drm/drm_panel.h> 15 #include <drm/drm_print.h> 16 #include <drm/drm_probe_helper.h> 17 18 #include <video/of_videomode.h> 19 #include <video/videomode.h> 20 21 #include "exynos_drm_crtc.h" 22 23 struct exynos_dpi { 24 struct drm_encoder encoder; 25 struct device *dev; 26 struct device_node *panel_node; 27 28 struct drm_panel *panel; 29 struct drm_connector connector; 30 31 struct videomode *vm; 32 }; 33 34 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) 35 36 static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e) 37 { 38 return container_of(e, struct exynos_dpi, encoder); 39 } 40 41 static enum drm_connector_status 42 exynos_dpi_detect(struct drm_connector *connector, bool force) 43 { 44 struct exynos_dpi *ctx = connector_to_dpi(connector); 45 46 if (ctx->panel && !ctx->panel->connector) 47 drm_panel_attach(ctx->panel, &ctx->connector); 48 49 return connector_status_connected; 50 } 51 52 static void exynos_dpi_connector_destroy(struct drm_connector *connector) 53 { 54 drm_connector_unregister(connector); 55 drm_connector_cleanup(connector); 56 } 57 58 static const struct drm_connector_funcs exynos_dpi_connector_funcs = { 59 .detect = exynos_dpi_detect, 60 .fill_modes = drm_helper_probe_single_connector_modes, 61 .destroy = exynos_dpi_connector_destroy, 62 .reset = drm_atomic_helper_connector_reset, 63 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 64 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 65 }; 66 67 static int exynos_dpi_get_modes(struct drm_connector *connector) 68 { 69 struct exynos_dpi *ctx = connector_to_dpi(connector); 70 71 /* fimd timings gets precedence over panel modes */ 72 if (ctx->vm) { 73 struct drm_display_mode *mode; 74 75 mode = drm_mode_create(connector->dev); 76 if (!mode) { 77 DRM_DEV_ERROR(ctx->dev, 78 "failed to create a new display mode\n"); 79 return 0; 80 } 81 drm_display_mode_from_videomode(ctx->vm, mode); 82 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 83 drm_mode_probed_add(connector, mode); 84 return 1; 85 } 86 87 if (ctx->panel) 88 return ctx->panel->funcs->get_modes(ctx->panel); 89 90 return 0; 91 } 92 93 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { 94 .get_modes = exynos_dpi_get_modes, 95 }; 96 97 static int exynos_dpi_create_connector(struct drm_encoder *encoder) 98 { 99 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 100 struct drm_connector *connector = &ctx->connector; 101 int ret; 102 103 connector->polled = DRM_CONNECTOR_POLL_HPD; 104 105 ret = drm_connector_init(encoder->dev, connector, 106 &exynos_dpi_connector_funcs, 107 DRM_MODE_CONNECTOR_VGA); 108 if (ret) { 109 DRM_DEV_ERROR(ctx->dev, 110 "failed to initialize connector with drm\n"); 111 return ret; 112 } 113 114 drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs); 115 drm_connector_attach_encoder(connector, encoder); 116 117 return 0; 118 } 119 120 static void exynos_dpi_mode_set(struct drm_encoder *encoder, 121 struct drm_display_mode *mode, 122 struct drm_display_mode *adjusted_mode) 123 { 124 } 125 126 static void exynos_dpi_enable(struct drm_encoder *encoder) 127 { 128 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 129 130 if (ctx->panel) { 131 drm_panel_prepare(ctx->panel); 132 drm_panel_enable(ctx->panel); 133 } 134 } 135 136 static void exynos_dpi_disable(struct drm_encoder *encoder) 137 { 138 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 139 140 if (ctx->panel) { 141 drm_panel_disable(ctx->panel); 142 drm_panel_unprepare(ctx->panel); 143 } 144 } 145 146 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = { 147 .mode_set = exynos_dpi_mode_set, 148 .enable = exynos_dpi_enable, 149 .disable = exynos_dpi_disable, 150 }; 151 152 static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = { 153 .destroy = drm_encoder_cleanup, 154 }; 155 156 enum { 157 FIMD_PORT_IN0, 158 FIMD_PORT_IN1, 159 FIMD_PORT_IN2, 160 FIMD_PORT_RGB, 161 FIMD_PORT_WRB, 162 }; 163 164 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) 165 { 166 struct device *dev = ctx->dev; 167 struct device_node *dn = dev->of_node; 168 struct device_node *np; 169 170 ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0); 171 172 np = of_get_child_by_name(dn, "display-timings"); 173 if (np) { 174 struct videomode *vm; 175 int ret; 176 177 of_node_put(np); 178 179 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); 180 if (!vm) 181 return -ENOMEM; 182 183 ret = of_get_videomode(dn, vm, 0); 184 if (ret < 0) { 185 devm_kfree(dev, vm); 186 return ret; 187 } 188 189 ctx->vm = vm; 190 191 return 0; 192 } 193 194 if (!ctx->panel_node) 195 return -EINVAL; 196 197 return 0; 198 } 199 200 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder) 201 { 202 int ret; 203 204 drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs, 205 DRM_MODE_ENCODER_TMDS, NULL); 206 207 drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs); 208 209 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 210 if (ret < 0) 211 return ret; 212 213 ret = exynos_dpi_create_connector(encoder); 214 if (ret) { 215 DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev, 216 "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