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 23 struct sun4i_rgb { 24 struct drm_connector connector; 25 struct drm_encoder encoder; 26 27 struct sun4i_drv *drv; 28 }; 29 30 static inline struct sun4i_rgb * 31 drm_connector_to_sun4i_rgb(struct drm_connector *connector) 32 { 33 return container_of(connector, struct sun4i_rgb, 34 connector); 35 } 36 37 static inline struct sun4i_rgb * 38 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder) 39 { 40 return container_of(encoder, struct sun4i_rgb, 41 encoder); 42 } 43 44 static int sun4i_rgb_get_modes(struct drm_connector *connector) 45 { 46 struct sun4i_rgb *rgb = 47 drm_connector_to_sun4i_rgb(connector); 48 struct sun4i_drv *drv = rgb->drv; 49 struct sun4i_tcon *tcon = drv->tcon; 50 51 return drm_panel_get_modes(tcon->panel); 52 } 53 54 static int sun4i_rgb_mode_valid(struct drm_connector *connector, 55 struct drm_display_mode *mode) 56 { 57 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector); 58 struct sun4i_drv *drv = rgb->drv; 59 struct sun4i_tcon *tcon = drv->tcon; 60 u32 hsync = mode->hsync_end - mode->hsync_start; 61 u32 vsync = mode->vsync_end - mode->vsync_start; 62 unsigned long rate = mode->clock * 1000; 63 long rounded_rate; 64 65 DRM_DEBUG_DRIVER("Validating modes...\n"); 66 67 if (hsync < 1) 68 return MODE_HSYNC_NARROW; 69 70 if (hsync > 0x3ff) 71 return MODE_HSYNC_WIDE; 72 73 if ((mode->hdisplay < 1) || (mode->htotal < 1)) 74 return MODE_H_ILLEGAL; 75 76 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff)) 77 return MODE_BAD_HVALUE; 78 79 DRM_DEBUG_DRIVER("Horizontal parameters OK\n"); 80 81 if (vsync < 1) 82 return MODE_VSYNC_NARROW; 83 84 if (vsync > 0x3ff) 85 return MODE_VSYNC_WIDE; 86 87 if ((mode->vdisplay < 1) || (mode->vtotal < 1)) 88 return MODE_V_ILLEGAL; 89 90 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff)) 91 return MODE_BAD_VVALUE; 92 93 DRM_DEBUG_DRIVER("Vertical parameters OK\n"); 94 95 rounded_rate = clk_round_rate(tcon->dclk, rate); 96 if (rounded_rate < rate) 97 return MODE_CLOCK_LOW; 98 99 if (rounded_rate > rate) 100 return MODE_CLOCK_HIGH; 101 102 DRM_DEBUG_DRIVER("Clock rate OK\n"); 103 104 return MODE_OK; 105 } 106 107 static struct drm_encoder * 108 sun4i_rgb_best_encoder(struct drm_connector *connector) 109 { 110 struct sun4i_rgb *rgb = 111 drm_connector_to_sun4i_rgb(connector); 112 113 return &rgb->encoder; 114 } 115 116 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = { 117 .get_modes = sun4i_rgb_get_modes, 118 .mode_valid = sun4i_rgb_mode_valid, 119 .best_encoder = sun4i_rgb_best_encoder, 120 }; 121 122 static enum drm_connector_status 123 sun4i_rgb_connector_detect(struct drm_connector *connector, bool force) 124 { 125 return connector_status_connected; 126 } 127 128 static void 129 sun4i_rgb_connector_destroy(struct drm_connector *connector) 130 { 131 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector); 132 struct sun4i_drv *drv = rgb->drv; 133 struct sun4i_tcon *tcon = drv->tcon; 134 135 drm_panel_detach(tcon->panel); 136 drm_connector_cleanup(connector); 137 } 138 139 static struct drm_connector_funcs sun4i_rgb_con_funcs = { 140 .dpms = drm_atomic_helper_connector_dpms, 141 .detect = sun4i_rgb_connector_detect, 142 .fill_modes = drm_helper_probe_single_connector_modes, 143 .destroy = sun4i_rgb_connector_destroy, 144 .reset = drm_atomic_helper_connector_reset, 145 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 146 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 147 }; 148 149 static int sun4i_rgb_atomic_check(struct drm_encoder *encoder, 150 struct drm_crtc_state *crtc_state, 151 struct drm_connector_state *conn_state) 152 { 153 return 0; 154 } 155 156 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder) 157 { 158 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 159 struct sun4i_drv *drv = rgb->drv; 160 struct sun4i_tcon *tcon = drv->tcon; 161 162 DRM_DEBUG_DRIVER("Enabling RGB output\n"); 163 164 drm_panel_enable(tcon->panel); 165 sun4i_tcon_channel_enable(tcon, 0); 166 } 167 168 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder) 169 { 170 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 171 struct sun4i_drv *drv = rgb->drv; 172 struct sun4i_tcon *tcon = drv->tcon; 173 174 DRM_DEBUG_DRIVER("Disabling RGB output\n"); 175 176 sun4i_tcon_channel_disable(tcon, 0); 177 drm_panel_disable(tcon->panel); 178 } 179 180 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder, 181 struct drm_display_mode *mode, 182 struct drm_display_mode *adjusted_mode) 183 { 184 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 185 struct sun4i_drv *drv = rgb->drv; 186 struct sun4i_tcon *tcon = drv->tcon; 187 188 sun4i_tcon0_mode_set(tcon, mode); 189 190 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); 191 192 /* FIXME: This seems to be board specific */ 193 clk_set_phase(tcon->dclk, 120); 194 } 195 196 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = { 197 .atomic_check = sun4i_rgb_atomic_check, 198 .mode_set = sun4i_rgb_encoder_mode_set, 199 .disable = sun4i_rgb_encoder_disable, 200 .enable = sun4i_rgb_encoder_enable, 201 }; 202 203 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder) 204 { 205 drm_encoder_cleanup(encoder); 206 } 207 208 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = { 209 .destroy = sun4i_rgb_enc_destroy, 210 }; 211 212 int sun4i_rgb_init(struct drm_device *drm) 213 { 214 struct sun4i_drv *drv = drm->dev_private; 215 struct sun4i_tcon *tcon = drv->tcon; 216 struct sun4i_rgb *rgb; 217 int ret; 218 219 /* If we don't have a panel, there's no point in going on */ 220 if (IS_ERR(tcon->panel)) 221 return -ENODEV; 222 223 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL); 224 if (!rgb) 225 return -ENOMEM; 226 rgb->drv = drv; 227 228 drm_encoder_helper_add(&rgb->encoder, 229 &sun4i_rgb_enc_helper_funcs); 230 ret = drm_encoder_init(drm, 231 &rgb->encoder, 232 &sun4i_rgb_enc_funcs, 233 DRM_MODE_ENCODER_NONE, 234 NULL); 235 if (ret) { 236 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n"); 237 goto err_out; 238 } 239 240 /* The RGB encoder can only work with the TCON channel 0 */ 241 rgb->encoder.possible_crtcs = BIT(0); 242 243 drm_connector_helper_add(&rgb->connector, 244 &sun4i_rgb_con_helper_funcs); 245 ret = drm_connector_init(drm, &rgb->connector, 246 &sun4i_rgb_con_funcs, 247 DRM_MODE_CONNECTOR_Unknown); 248 if (ret) { 249 dev_err(drm->dev, "Couldn't initialise the rgb connector\n"); 250 goto err_cleanup_connector; 251 } 252 253 drm_mode_connector_attach_encoder(&rgb->connector, &rgb->encoder); 254 255 drm_panel_attach(tcon->panel, &rgb->connector); 256 257 return 0; 258 259 err_cleanup_connector: 260 drm_encoder_cleanup(&rgb->encoder); 261 err_out: 262 return ret; 263 } 264 EXPORT_SYMBOL(sun4i_rgb_init); 265