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