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); 157 158 sun4i_tcon_channel_enable(tcon, 0); 159 160 if (!IS_ERR(tcon->panel)) 161 drm_panel_enable(tcon->panel); 162 } 163 164 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder) 165 { 166 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 167 struct sun4i_drv *drv = rgb->drv; 168 struct sun4i_tcon *tcon = drv->tcon; 169 170 DRM_DEBUG_DRIVER("Disabling RGB output\n"); 171 172 if (!IS_ERR(tcon->panel)) 173 drm_panel_disable(tcon->panel); 174 175 sun4i_tcon_channel_disable(tcon, 0); 176 177 if (!IS_ERR(tcon->panel)) 178 drm_panel_unprepare(tcon->panel); 179 } 180 181 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder, 182 struct drm_display_mode *mode, 183 struct drm_display_mode *adjusted_mode) 184 { 185 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 186 struct sun4i_drv *drv = rgb->drv; 187 struct sun4i_tcon *tcon = drv->tcon; 188 189 sun4i_tcon0_mode_set(tcon, mode); 190 191 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); 192 193 /* FIXME: This seems to be board specific */ 194 clk_set_phase(tcon->dclk, 120); 195 } 196 197 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = { 198 .atomic_check = sun4i_rgb_atomic_check, 199 .mode_set = sun4i_rgb_encoder_mode_set, 200 .disable = sun4i_rgb_encoder_disable, 201 .enable = sun4i_rgb_encoder_enable, 202 }; 203 204 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder) 205 { 206 drm_encoder_cleanup(encoder); 207 } 208 209 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = { 210 .destroy = sun4i_rgb_enc_destroy, 211 }; 212 213 int sun4i_rgb_init(struct drm_device *drm) 214 { 215 struct sun4i_drv *drv = drm->dev_private; 216 struct sun4i_tcon *tcon = drv->tcon; 217 struct drm_encoder *encoder; 218 struct sun4i_rgb *rgb; 219 int ret; 220 221 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL); 222 if (!rgb) 223 return -ENOMEM; 224 rgb->drv = drv; 225 encoder = &rgb->encoder; 226 227 tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node); 228 encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node); 229 if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) { 230 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n"); 231 return 0; 232 } 233 234 drm_encoder_helper_add(&rgb->encoder, 235 &sun4i_rgb_enc_helper_funcs); 236 ret = drm_encoder_init(drm, 237 &rgb->encoder, 238 &sun4i_rgb_enc_funcs, 239 DRM_MODE_ENCODER_NONE, 240 NULL); 241 if (ret) { 242 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n"); 243 goto err_out; 244 } 245 246 /* The RGB encoder can only work with the TCON channel 0 */ 247 rgb->encoder.possible_crtcs = BIT(0); 248 249 if (!IS_ERR(tcon->panel)) { 250 drm_connector_helper_add(&rgb->connector, 251 &sun4i_rgb_con_helper_funcs); 252 ret = drm_connector_init(drm, &rgb->connector, 253 &sun4i_rgb_con_funcs, 254 DRM_MODE_CONNECTOR_Unknown); 255 if (ret) { 256 dev_err(drm->dev, "Couldn't initialise the rgb connector\n"); 257 goto err_cleanup_connector; 258 } 259 260 drm_mode_connector_attach_encoder(&rgb->connector, 261 &rgb->encoder); 262 263 ret = drm_panel_attach(tcon->panel, &rgb->connector); 264 if (ret) { 265 dev_err(drm->dev, "Couldn't attach our panel\n"); 266 goto err_cleanup_connector; 267 } 268 } 269 270 if (!IS_ERR(encoder->bridge)) { 271 encoder->bridge->encoder = &rgb->encoder; 272 273 ret = drm_bridge_attach(drm, encoder->bridge); 274 if (ret) { 275 dev_err(drm->dev, "Couldn't attach our bridge\n"); 276 goto err_cleanup_connector; 277 } 278 } else { 279 encoder->bridge = NULL; 280 } 281 282 return 0; 283 284 err_cleanup_connector: 285 drm_encoder_cleanup(&rgb->encoder); 286 err_out: 287 return ret; 288 } 289 EXPORT_SYMBOL(sun4i_rgb_init); 290