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
  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);