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 #include <drm/drm_simple_kms_helper.h> 18 19 #include <video/of_videomode.h> 20 #include <video/videomode.h> 21 22 #include "exynos_drm_crtc.h" 23 24 struct exynos_dpi { 25 struct drm_encoder encoder; 26 struct device *dev; 27 struct device_node *panel_node; 28 29 struct drm_panel *panel; 30 struct drm_connector connector; 31 32 struct videomode *vm; 33 }; 34 35 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) 36 37 static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e) 38 { 39 return container_of(e, struct exynos_dpi, encoder); 40 } 41 42 static enum drm_connector_status 43 exynos_dpi_detect(struct drm_connector *connector, bool force) 44 { 45 struct exynos_dpi *ctx = connector_to_dpi(connector); 46 47 if (ctx->panel) 48 drm_panel_attach(ctx->panel, &ctx->connector); 49 50 return connector_status_connected; 51 } 52 53 static void exynos_dpi_connector_destroy(struct drm_connector *connector) 54 { 55 drm_connector_unregister(connector); 56 drm_connector_cleanup(connector); 57 } 58 59 static const struct drm_connector_funcs exynos_dpi_connector_funcs = { 60 .detect = exynos_dpi_detect, 61 .fill_modes = drm_helper_probe_single_connector_modes, 62 .destroy = exynos_dpi_connector_destroy, 63 .reset = drm_atomic_helper_connector_reset, 64 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 65 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 66 }; 67 68 static int exynos_dpi_get_modes(struct drm_connector *connector) 69 { 70 struct exynos_dpi *ctx = connector_to_dpi(connector); 71 72 /* fimd timings gets precedence over panel modes */ 73 if (ctx->vm) { 74 struct drm_display_mode *mode; 75 76 mode = drm_mode_create(connector->dev); 77 if (!mode) { 78 DRM_DEV_ERROR(ctx->dev, 79 "failed to create a new display mode\n"); 80 return 0; 81 } 82 drm_display_mode_from_videomode(ctx->vm, mode); 83 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 84 drm_mode_probed_add(connector, mode); 85 return 1; 86 } 87 88 if (ctx->panel) 89 return drm_panel_get_modes(ctx->panel, connector); 90 91 return 0; 92 } 93 94 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { 95 .get_modes = exynos_dpi_get_modes, 96 }; 97 98 static int exynos_dpi_create_connector(struct drm_encoder *encoder) 99 { 100 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 101 struct drm_connector *connector = &ctx->connector; 102 int ret; 103 104 connector->polled = DRM_CONNECTOR_POLL_HPD; 105 106 ret = drm_connector_init(encoder->dev, connector, 107 &exynos_dpi_connector_funcs, 108 DRM_MODE_CONNECTOR_VGA); 109 if (ret) { 110 DRM_DEV_ERROR(ctx->dev, 111 "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 enum { 154 FIMD_PORT_IN0, 155 FIMD_PORT_IN1, 156 FIMD_PORT_IN2, 157 FIMD_PORT_RGB, 158 FIMD_PORT_WRB, 159 }; 160 161 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) 162 { 163 struct device *dev = ctx->dev; 164 struct device_node *dn = dev->of_node; 165 struct device_node *np; 166 167 ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0); 168 169 np = of_get_child_by_name(dn, "display-timings"); 170 if (np) { 171 struct videomode *vm; 172 int ret; 173 174 of_node_put(np); 175 176 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); 177 if (!vm) 178 return -ENOMEM; 179 180 ret = of_get_videomode(dn, vm, 0); 181 if (ret < 0) { 182 devm_kfree(dev, vm); 183 return ret; 184 } 185 186 ctx->vm = vm; 187 188 return 0; 189 } 190 191 if (!ctx->panel_node) 192 return -EINVAL; 193 194 return 0; 195 } 196 197 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder) 198 { 199 int ret; 200 201 drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS); 202 203 drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs); 204 205 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 206 if (ret < 0) 207 return ret; 208 209 ret = exynos_dpi_create_connector(encoder); 210 if (ret) { 211 DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev, 212 "failed to create connector ret = %d\n", ret); 213 drm_encoder_cleanup(encoder); 214 return ret; 215 } 216 217 return 0; 218 } 219 220 struct drm_encoder *exynos_dpi_probe(struct device *dev) 221 { 222 struct exynos_dpi *ctx; 223 int ret; 224 225 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 226 if (!ctx) 227 return ERR_PTR(-ENOMEM); 228 229 ctx->dev = dev; 230 231 ret = exynos_dpi_parse_dt(ctx); 232 if (ret < 0) { 233 devm_kfree(dev, ctx); 234 return NULL; 235 } 236 237 if (ctx->panel_node) { 238 ctx->panel = of_drm_find_panel(ctx->panel_node); 239 if (IS_ERR(ctx->panel)) 240 return ERR_CAST(ctx->panel); 241 } 242 243 return &ctx->encoder; 244 } 245 246 int exynos_dpi_remove(struct drm_encoder *encoder) 247 { 248 struct exynos_dpi *ctx = encoder_to_dpi(encoder); 249 250 exynos_dpi_disable(&ctx->encoder); 251 252 if (ctx->panel) 253 drm_panel_detach(ctx->panel); 254 255 return 0; 256 } 257