drivers/gpu/drm/sun4i/sun4i_rgb.c

   1 /*
   2  * Copyright (C) 2015 Free Electrons
   3  * Copyright (C) 2015 NextThing Co
   4  *
   5  * Maxime Ripard <[email protected]>
   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);