drivers/gpu/drm/sun4i/sun4i_rgb.c

   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 void
 114 sun4i_rgb_connector_destroy(struct drm_connector *connector)
 115 {
 116         struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
 117         struct sun4i_drv *drv = rgb->drv;
 118         struct sun4i_tcon *tcon = drv->tcon;
 119
 120         drm_panel_detach(tcon->panel);
 121         drm_connector_cleanup(connector);
 122 }
 123
 124 static struct drm_connector_funcs sun4i_rgb_con_funcs = {
 125         .dpms                   = drm_atomic_helper_connector_dpms,
 126         .fill_modes             = drm_helper_probe_single_connector_modes,
 127         .destroy                = sun4i_rgb_connector_destroy,
 128         .reset                  = drm_atomic_helper_connector_reset,
 129         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 130         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 131 };
 132
 133 static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
 134                                   struct drm_crtc_state *crtc_state,
 135                                   struct drm_connector_state *conn_state)
 136 {
 137         return 0;
 138 }
 139
 140 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
 141 {
 142         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 143         struct sun4i_drv *drv = rgb->drv;
 144         struct sun4i_tcon *tcon = drv->tcon;
 145
 146         DRM_DEBUG_DRIVER("Enabling RGB output\n");
 147
 148         if (!IS_ERR(tcon->panel))
 149                 drm_panel_prepare(tcon->panel);
 150
 151         sun4i_tcon_channel_enable(tcon, 0);
 152
 153         if (!IS_ERR(tcon->panel))
 154                 drm_panel_enable(tcon->panel);
 155 }
 156
 157 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
 158 {
 159         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 160         struct sun4i_drv *drv = rgb->drv;
 161         struct sun4i_tcon *tcon = drv->tcon;
 162
 163         DRM_DEBUG_DRIVER("Disabling RGB output\n");
 164
 165         if (!IS_ERR(tcon->panel))
 166                 drm_panel_disable(tcon->panel);
 167
 168         sun4i_tcon_channel_disable(tcon, 0);
 169
 170         if (!IS_ERR(tcon->panel))
 171                 drm_panel_unprepare(tcon->panel);
 172 }
 173
 174 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
 175                                        struct drm_display_mode *mode,
 176                                        struct drm_display_mode *adjusted_mode)
 177 {
 178         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 179         struct sun4i_drv *drv = rgb->drv;
 180         struct sun4i_tcon *tcon = drv->tcon;
 181
 182         sun4i_tcon0_mode_set(tcon, mode);
 183
 184         clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
 185
 186         /* FIXME: This seems to be board specific */
 187         clk_set_phase(tcon->dclk, 120);
 188 }
 189
 190 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
 191         .atomic_check   = sun4i_rgb_atomic_check,
 192         .mode_set       = sun4i_rgb_encoder_mode_set,
 193         .disable        = sun4i_rgb_encoder_disable,
 194         .enable         = sun4i_rgb_encoder_enable,
 195 };
 196
 197 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
 198 {
 199         drm_encoder_cleanup(encoder);
 200 }
 201
 202 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
 203         .destroy        = sun4i_rgb_enc_destroy,
 204 };
 205
 206 int sun4i_rgb_init(struct drm_device *drm)
 207 {
 208         struct sun4i_drv *drv = drm->dev_private;
 209         struct sun4i_tcon *tcon = drv->tcon;
 210         struct drm_encoder *encoder;
 211         struct drm_bridge *bridge;
 212         struct sun4i_rgb *rgb;
 213         int ret;
 214
 215         rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
 216         if (!rgb)
 217                 return -ENOMEM;
 218         rgb->drv = drv;
 219         encoder = &rgb->encoder;
 220
 221         tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
 222         bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
 223         if (IS_ERR(tcon->panel) && IS_ERR(bridge)) {
 224                 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
 225                 return 0;
 226         }
 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         if (!IS_ERR(tcon->panel)) {
 244                 drm_connector_helper_add(&rgb->connector,
 245                                          &sun4i_rgb_con_helper_funcs);
 246                 ret = drm_connector_init(drm, &rgb->connector,
 247                                          &sun4i_rgb_con_funcs,
 248                                          DRM_MODE_CONNECTOR_Unknown);
 249                 if (ret) {
 250                         dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
 251                         goto err_cleanup_connector;
 252                 }
 253
 254                 drm_mode_connector_attach_encoder(&rgb->connector,
 255                                                   &rgb->encoder);
 256
 257                 ret = drm_panel_attach(tcon->panel, &rgb->connector);
 258                 if (ret) {
 259                         dev_err(drm->dev, "Couldn't attach our panel\n");
 260                         goto err_cleanup_connector;
 261                 }
 262         }
 263
 264         if (!IS_ERR(bridge)) {
 265                 ret = drm_bridge_attach(encoder, bridge, NULL);
 266                 if (ret) {
 267                         dev_err(drm->dev, "Couldn't attach our bridge\n");
 268                         goto err_cleanup_connector;
 269                 }
 270         }
 271
 272         return 0;
 273
 274 err_cleanup_connector:
 275         drm_encoder_cleanup(&rgb->encoder);
 276 err_out:
 277         return ret;
 278 }
 279 EXPORT_SYMBOL(sun4i_rgb_init);