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_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         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_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
 108         .get_modes      = sun4i_rgb_get_modes,
 109         .mode_valid     = sun4i_rgb_mode_valid,
 110 };
 111
 112 static void
 113 sun4i_rgb_connector_destroy(struct drm_connector *connector)
 114 {
 115         struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
 116         struct sun4i_tcon *tcon = rgb->tcon;
 117
 118         drm_panel_detach(tcon->panel);
 119         drm_connector_cleanup(connector);
 120 }
 121
 122 static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
 123         .fill_modes             = drm_helper_probe_single_connector_modes,
 124         .destroy                = sun4i_rgb_connector_destroy,
 125         .reset                  = drm_atomic_helper_connector_reset,
 126         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 127         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 128 };
 129
 130 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
 131 {
 132         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 133         struct sun4i_tcon *tcon = rgb->tcon;
 134
 135         DRM_DEBUG_DRIVER("Enabling RGB output\n");
 136
 137         if (!IS_ERR(tcon->panel))
 138                 drm_panel_prepare(tcon->panel);
 139
 140         sun4i_tcon_channel_enable(tcon, 0);
 141
 142         if (!IS_ERR(tcon->panel))
 143                 drm_panel_enable(tcon->panel);
 144 }
 145
 146 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
 147 {
 148         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 149         struct sun4i_tcon *tcon = rgb->tcon;
 150
 151         DRM_DEBUG_DRIVER("Disabling RGB output\n");
 152
 153         if (!IS_ERR(tcon->panel))
 154                 drm_panel_disable(tcon->panel);
 155
 156         sun4i_tcon_channel_disable(tcon, 0);
 157
 158         if (!IS_ERR(tcon->panel))
 159                 drm_panel_unprepare(tcon->panel);
 160 }
 161
 162 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
 163                                        struct drm_display_mode *mode,
 164                                        struct drm_display_mode *adjusted_mode)
 165 {
 166         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 167         struct sun4i_tcon *tcon = rgb->tcon;
 168
 169         sun4i_tcon0_mode_set(tcon, mode);
 170         sun4i_tcon_set_mux(tcon, 0, encoder);
 171
 172         /* FIXME: This seems to be board specific */
 173         clk_set_phase(tcon->dclk, 120);
 174 }
 175
 176 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
 177         .mode_set       = sun4i_rgb_encoder_mode_set,
 178         .disable        = sun4i_rgb_encoder_disable,
 179         .enable         = sun4i_rgb_encoder_enable,
 180 };
 181
 182 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
 183 {
 184         drm_encoder_cleanup(encoder);
 185 }
 186
 187 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
 188         .destroy        = sun4i_rgb_enc_destroy,
 189 };
 190
 191 int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
 192 {
 193         struct drm_encoder *encoder;
 194         struct drm_bridge *bridge;
 195         struct sun4i_rgb *rgb;
 196         int ret;
 197
 198         rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
 199         if (!rgb)
 200                 return -ENOMEM;
 201         rgb->tcon = tcon;
 202         encoder = &rgb->encoder;
 203
 204         ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
 205                                           &tcon->panel, &bridge);
 206         if (ret) {
 207                 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
 208                 return 0;
 209         }
 210
 211         drm_encoder_helper_add(&rgb->encoder,
 212                                &sun4i_rgb_enc_helper_funcs);
 213         ret = drm_encoder_init(drm,
 214                                &rgb->encoder,
 215                                &sun4i_rgb_enc_funcs,
 216                                DRM_MODE_ENCODER_NONE,
 217                                NULL);
 218         if (ret) {
 219                 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
 220                 goto err_out;
 221         }
 222
 223         /* The RGB encoder can only work with the TCON channel 0 */
 224         rgb->encoder.possible_crtcs = BIT(drm_crtc_index(&tcon->crtc->crtc));
 225
 226         if (tcon->panel) {
 227                 drm_connector_helper_add(&rgb->connector,
 228                                          &sun4i_rgb_con_helper_funcs);
 229                 ret = drm_connector_init(drm, &rgb->connector,
 230                                          &sun4i_rgb_con_funcs,
 231                                          DRM_MODE_CONNECTOR_Unknown);
 232                 if (ret) {
 233                         dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
 234                         goto err_cleanup_connector;
 235                 }
 236
 237                 drm_mode_connector_attach_encoder(&rgb->connector,
 238                                                   &rgb->encoder);
 239
 240                 ret = drm_panel_attach(tcon->panel, &rgb->connector);
 241                 if (ret) {
 242                         dev_err(drm->dev, "Couldn't attach our panel\n");
 243                         goto err_cleanup_connector;
 244                 }
 245         }
 246
 247         if (bridge) {
 248                 ret = drm_bridge_attach(encoder, bridge, NULL);
 249                 if (ret) {
 250                         dev_err(drm->dev, "Couldn't attach our bridge\n");
 251                         goto err_cleanup_connector;
 252                 }
 253         }
 254
 255         return 0;
 256
 257 err_cleanup_connector:
 258         drm_encoder_cleanup(&rgb->encoder);
 259 err_out:
 260         return ret;
 261 }
 262 EXPORT_SYMBOL(sun4i_rgb_init);