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_of.h> 19 #include <drm/drm_panel.h> 20 21 #include "sun4i_crtc.h" 22 #include "sun4i_tcon.h" 23 #include "sun4i_rgb.h" 24 25 struct sun4i_rgb { 26 struct drm_connector connector; 27 struct drm_encoder encoder; 28 29 struct sun4i_tcon *tcon; 30 }; 31 32 static inline struct sun4i_rgb * 33 drm_connector_to_sun4i_rgb(struct drm_connector *connector) 34 { 35 return container_of(connector, struct sun4i_rgb, 36 connector); 37 } 38 39 static inline struct sun4i_rgb * 40 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder) 41 { 42 return container_of(encoder, struct sun4i_rgb, 43 encoder); 44 } 45 46 static int sun4i_rgb_get_modes(struct drm_connector *connector) 47 { 48 struct sun4i_rgb *rgb = 49 drm_connector_to_sun4i_rgb(connector); 50 struct sun4i_tcon *tcon = rgb->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_tcon *tcon = rgb->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 tcon->dclk_min_div = 6; 96 tcon->dclk_max_div = 127; 97 rounded_rate = clk_round_rate(tcon->dclk, rate); 98 if (rounded_rate < rate) 99 return MODE_CLOCK_LOW; 100 101 if (rounded_rate > rate) 102 return MODE_CLOCK_HIGH; 103 104 DRM_DEBUG_DRIVER("Clock rate OK\n"); 105 106 return MODE_OK; 107 } 108 109 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = { 110 .get_modes = sun4i_rgb_get_modes, 111 .mode_valid = sun4i_rgb_mode_valid, 112 }; 113 114 static void 115 sun4i_rgb_connector_destroy(struct drm_connector *connector) 116 { 117 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector); 118 struct sun4i_tcon *tcon = rgb->tcon; 119 120 drm_panel_detach(tcon->panel); 121 drm_connector_cleanup(connector); 122 } 123 124 static const struct drm_connector_funcs sun4i_rgb_con_funcs = { 125 .fill_modes = drm_helper_probe_single_connector_modes, 126 .destroy = sun4i_rgb_connector_destroy, 127 .reset = drm_atomic_helper_connector_reset, 128 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 129 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 130 }; 131 132 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder) 133 { 134 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 135 struct sun4i_tcon *tcon = rgb->tcon; 136 137 DRM_DEBUG_DRIVER("Enabling RGB output\n"); 138 139 if (!IS_ERR(tcon->panel)) { 140 drm_panel_prepare(tcon->panel); 141 drm_panel_enable(tcon->panel); 142 } 143 } 144 145 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder) 146 { 147 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder); 148 struct sun4i_tcon *tcon = rgb->tcon; 149 150 DRM_DEBUG_DRIVER("Disabling RGB output\n"); 151 152 if (!IS_ERR(tcon->panel)) { 153 drm_panel_disable(tcon->panel); 154 drm_panel_unprepare(tcon->panel); 155 } 156 } 157 158 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = { 159 .disable = sun4i_rgb_encoder_disable, 160 .enable = sun4i_rgb_encoder_enable, 161 }; 162 163 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder) 164 { 165 drm_encoder_cleanup(encoder); 166 } 167 168 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = { 169 .destroy = sun4i_rgb_enc_destroy, 170 }; 171 172 int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon) 173 { 174 struct drm_encoder *encoder; 175 struct drm_bridge *bridge; 176 struct sun4i_rgb *rgb; 177 int ret; 178 179 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL); 180 if (!rgb) 181 return -ENOMEM; 182 rgb->tcon = tcon; 183 encoder = &rgb->encoder; 184 185 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0, 186 &tcon->panel, &bridge); 187 if (ret) { 188 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n"); 189 return 0; 190 } 191 192 drm_encoder_helper_add(&rgb->encoder, 193 &sun4i_rgb_enc_helper_funcs); 194 ret = drm_encoder_init(drm, 195 &rgb->encoder, 196 &sun4i_rgb_enc_funcs, 197 DRM_MODE_ENCODER_NONE, 198 NULL); 199 if (ret) { 200 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n"); 201 goto err_out; 202 } 203 204 /* The RGB encoder can only work with the TCON channel 0 */ 205 rgb->encoder.possible_crtcs = BIT(drm_crtc_index(&tcon->crtc->crtc)); 206 207 if (tcon->panel) { 208 drm_connector_helper_add(&rgb->connector, 209 &sun4i_rgb_con_helper_funcs); 210 ret = drm_connector_init(drm, &rgb->connector, 211 &sun4i_rgb_con_funcs, 212 DRM_MODE_CONNECTOR_Unknown); 213 if (ret) { 214 dev_err(drm->dev, "Couldn't initialise the rgb connector\n"); 215 goto err_cleanup_connector; 216 } 217 218 drm_mode_connector_attach_encoder(&rgb->connector, 219 &rgb->encoder); 220 221 ret = drm_panel_attach(tcon->panel, &rgb->connector); 222 if (ret) { 223 dev_err(drm->dev, "Couldn't attach our panel\n"); 224 goto err_cleanup_connector; 225 } 226 } 227 228 if (bridge) { 229 ret = drm_bridge_attach(encoder, bridge, NULL); 230 if (ret) { 231 dev_err(drm->dev, "Couldn't attach our bridge\n"); 232 goto err_cleanup_connector; 233 } 234 } 235 236 return 0; 237 238 err_cleanup_connector: 239 drm_encoder_cleanup(&rgb->encoder); 240 err_out: 241 return ret; 242 } 243 EXPORT_SYMBOL(sun4i_rgb_init); 244