1 /* 2 * Copyright (C) 2015 Free Electrons 3 * Copyright (C) 2015 NextThing Co 4 * 5 * Maxime Ripard <maxime.ripard@free-electrons.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 */ 12 13 #include <linux/clk.h> 14 15 #include <drm/drmP.h> 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_panel.h> 19 20 #include "sun4i_drv.h" 21 #include "sun4i_tcon.h" 22 #include "sun4i_rgb.h" 23 24 struct sun4i_rgb { 25 struct drm_connector connector; 26 struct drm_encoder encoder; 27 28 struct sun4i_drv *drv; 29 }; 30 31 static inline struct sun4i_rgb * 32 drm_connector_to_sun4i_rgb(struct drm_connector *connector) 33 { 34 return container_of(connector, struct sun4i_rgb, 35 connector); 36 } 37 38 static inline struct sun4i_rgb * 39 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder) 40 { 41 return container_of(encoder, struct sun4i_rgb, 42 encoder); 43 } 44 45 static int sun4i_rgb_get_modes(struct drm_connector *connector) 46 { 47 struct sun4i_rgb *rgb = 48 drm_connector_to_sun4i_rgb(connector); 49 struct sun4i_drv *drv = rgb->drv; 50 struct sun4i_tcon *tcon = drv->tcon; 51 52 return drm_panel_get_modes(tcon->panel); 53 } 54 55 static int sun4i_rgb_mode_valid(struct drm_connector *connector, 56 struct drm_display_mode *mode) 57 { 58 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector); 59 struct sun4i_drv *drv = rgb->drv; 60 struct sun4i_tcon *tcon = drv->tcon; 61 u32 hsync = mode->hsync_end - mode->hsync_start; 62 u32 vsync = mode->vsync_end - mode->vsync_start; 63 unsigned long rate = mode->clock * 1000; 64 long rounded_rate; 65 66 DRM_DEBUG_DRIVER("Validating modes...\n"); 67 68 if (hsync < 1) 69 return MODE_HSYNC_NARROW; 70 71 if (hsync > 0x3ff) 72 return MODE_HSYNC_WIDE; 73 74 if ((mode->hdisplay < 1) || (mode->htotal < 1)) 75 return MODE_H_ILLEGAL; 76 77 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff)) 78 return MODE_BAD_HVALUE; 79 80 DRM_DEBUG_DRIVER("Horizontal parameters OK\n"); 81 82 if (vsync < 1) 83 return MODE_VSYNC_NARROW; 84 85 if (vsync > 0x3ff) 86 return MODE_VSYNC_WIDE; 87 88 if ((mode->vdisplay < 1) || (mode->vtotal < 1)) 89 return MODE_V_ILLEGAL; 90 91 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff)) 92 return MODE_BAD_VVALUE; 93 94 DRM_DEBUG_DRIVER("Vertical parameters OK\n"); 95 96 rounded_rate = clk_round_rate(tcon->dclk, rate); 97 if (rounded_rate < rate) 98 return MODE_CLOCK_LOW; 99 100 if (rounded_rate > rate) 101 return MODE_CLOCK_HIGH; 102 103 DRM_DEBUG_DRIVER("Clock rate OK\n"); 104 105 return MODE_OK; 106 } 107 108 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = { 109 .get_modes = sun4i_rgb_get_modes, 110 .mode_valid = sun4i_rgb_mode_valid, 111 }; 112 113 static enum drm_connector_status 114 sun4i_rgb_connector_detect(struct drm_connector *connector, bool force) 115 { 116 return connector_status_connected; 117 } 118 119 static void 120 sun4i_rgb_connector_destroy(struct drm_connector *connector) 121 { 122 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector); 123 struct sun4i_drv *drv = rgb->drv; 124 struct sun4i_tcon *tcon = drv->tcon; 125 126 drm_panel_detach(tcon->panel); 127 drm_connector_cleanup(connector); 128 } 129 130 static struct drm_connector_funcs sun4i_rgb_con_funcs = { 131 .dpms = drm_atomic_helper_connector_dpms, 132 .detect = sun4i_rgb_connector_detect, 133 .fill_modes = drm_helper_probe_single_connector_modes, 134 .destroy = sun4i_rgb_connector_destroy, 135 .reset = drm_atomic_helper_connector_reset, 136 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 137 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 138 }; 139 140 static int sun4i_rgb_atomic_check(struct drm_encoder *encoder, 141 struct drm_crtc_state *crtc_state, 142 struct drm_connector_state *conn_state) 143 { 144 return 0; 145 } 146 147 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder) 148 { 149 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 150 struct sun4i_drv *drv = rgb->drv; 151 struct sun4i_tcon *tcon = drv->tcon; 152 153 DRM_DEBUG_DRIVER("Enabling RGB output\n"); 154 155 if (!IS_ERR(tcon->panel)) { 156 drm_panel_prepare(tcon->panel); 157 drm_panel_enable(tcon->panel); 158 } 159 160 /* encoder->bridge can be NULL; drm_bridge_enable checks for it */ 161 drm_bridge_enable(encoder->bridge); 162 163 sun4i_tcon_channel_enable(tcon, 0); 164 } 165 166 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder) 167 { 168 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 169 struct sun4i_drv *drv = rgb->drv; 170 struct sun4i_tcon *tcon = drv->tcon; 171 172 DRM_DEBUG_DRIVER("Disabling RGB output\n"); 173 174 sun4i_tcon_channel_disable(tcon, 0); 175 176 /* encoder->bridge can be NULL; drm_bridge_disable checks for it */ 177 drm_bridge_disable(encoder->bridge); 178 179 if (!IS_ERR(tcon->panel)) { 180 drm_panel_disable(tcon->panel); 181 drm_panel_unprepare(tcon->panel); 182 } 183 } 184 185 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder, 186 struct drm_display_mode *mode, 187 struct drm_display_mode *adjusted_mode) 188 { 189 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 190 struct sun4i_drv *drv = rgb->drv; 191 struct sun4i_tcon *tcon = drv->tcon; 192 193 sun4i_tcon0_mode_set(tcon, mode); 194 195 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); 196 197 /* FIXME: This seems to be board specific */ 198 clk_set_phase(tcon->dclk, 120); 199 } 200 201 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = { 202 .atomic_check = sun4i_rgb_atomic_check, 203 .mode_set = sun4i_rgb_encoder_mode_set, 204 .disable = sun4i_rgb_encoder_disable, 205 .enable = sun4i_rgb_encoder_enable, 206 }; 207 208 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder) 209 { 210 drm_encoder_cleanup(encoder); 211 } 212 213 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = { 214 .destroy = sun4i_rgb_enc_destroy, 215 }; 216 217 int sun4i_rgb_init(struct drm_device *drm) 218 { 219 struct sun4i_drv *drv = drm->dev_private; 220 struct sun4i_tcon *tcon = drv->tcon; 221 struct drm_encoder *encoder; 222 struct sun4i_rgb *rgb; 223 int ret; 224 225 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL); 226 if (!rgb) 227 return -ENOMEM; 228 rgb->drv = drv; 229 encoder = &rgb->encoder; 230 231 tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node); 232 encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node); 233 if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) { 234 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n"); 235 return 0; 236 } 237 238 drm_encoder_helper_add(&rgb->encoder, 239 &sun4i_rgb_enc_helper_funcs); 240 ret = drm_encoder_init(drm, 241 &rgb->encoder, 242 &sun4i_rgb_enc_funcs, 243 DRM_MODE_ENCODER_NONE, 244 NULL); 245 if (ret) { 246 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n"); 247 goto err_out; 248 } 249 250 /* The RGB encoder can only work with the TCON channel 0 */ 251 rgb->encoder.possible_crtcs = BIT(0); 252 253 if (!IS_ERR(tcon->panel)) { 254 drm_connector_helper_add(&rgb->connector, 255 &sun4i_rgb_con_helper_funcs); 256 ret = drm_connector_init(drm, &rgb->connector, 257 &sun4i_rgb_con_funcs, 258 DRM_MODE_CONNECTOR_Unknown); 259 if (ret) { 260 dev_err(drm->dev, "Couldn't initialise the rgb connector\n"); 261 goto err_cleanup_connector; 262 } 263 264 drm_mode_connector_attach_encoder(&rgb->connector, 265 &rgb->encoder); 266 267 ret = drm_panel_attach(tcon->panel, &rgb->connector); 268 if (ret) { 269 dev_err(drm->dev, "Couldn't attach our panel\n"); 270 goto err_cleanup_connector; 271 } 272 } 273 274 if (!IS_ERR(encoder->bridge)) { 275 encoder->bridge->encoder = &rgb->encoder; 276 277 ret = drm_bridge_attach(drm, encoder->bridge); 278 if (ret) { 279 dev_err(drm->dev, "Couldn't attach our bridge\n"); 280 goto err_cleanup_connector; 281 } 282 } else { 283 encoder->bridge = NULL; 284 } 285 286 return 0; 287 288 err_cleanup_connector: 289 drm_encoder_cleanup(&rgb->encoder); 290 err_out: 291 return ret; 292 } 293 EXPORT_SYMBOL(sun4i_rgb_init); 294