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