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 enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,
  56                                                  const struct drm_display_mode *mode)
  57 {
  58         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);
  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         tcon->dclk_min_div = 6;
  96         tcon->dclk_max_div = 127;
  97         rounded_rate = clk_round_rate(tcon->dclk, rate);
  98         if (rounded_rate < rate)
  99                 return MODE_CLOCK_LOW;
 100
 101         if (rounded_rate > rate)
 102                 return MODE_CLOCK_HIGH;
 103
 104         DRM_DEBUG_DRIVER("Clock rate OK\n");
 105
 106         return MODE_OK;
 107 }
 108
 109 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
 110         .get_modes      = sun4i_rgb_get_modes,
 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_tcon *tcon = rgb->tcon;
 118
 119         drm_panel_detach(tcon->panel);
 120         drm_connector_cleanup(connector);
 121 }
 122
 123 static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
 124         .fill_modes             = drm_helper_probe_single_connector_modes,
 125         .destroy                = sun4i_rgb_connector_destroy,
 126         .reset                  = drm_atomic_helper_connector_reset,
 127         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 128         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 129 };
 130
 131 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
 132 {
 133         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 134         struct sun4i_tcon *tcon = rgb->tcon;
 135
 136         DRM_DEBUG_DRIVER("Enabling RGB output\n");
 137
 138         if (!IS_ERR(tcon->panel)) {
 139                 drm_panel_prepare(tcon->panel);
 140                 drm_panel_enable(tcon->panel);
 141         }
 142 }
 143
 144 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
 145 {
 146         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 147         struct sun4i_tcon *tcon = rgb->tcon;
 148
 149         DRM_DEBUG_DRIVER("Disabling RGB output\n");
 150
 151         if (!IS_ERR(tcon->panel)) {
 152                 drm_panel_disable(tcon->panel);
 153                 drm_panel_unprepare(tcon->panel);
 154         }
 155 }
 156
 157 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
 158         .disable        = sun4i_rgb_encoder_disable,
 159         .enable         = sun4i_rgb_encoder_enable,
 160         .mode_valid     = sun4i_rgb_mode_valid,
 161 };
 162
 163 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
 164 {
 165         drm_encoder_cleanup(encoder);
 166 }
 167
 168 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
 169         .destroy        = sun4i_rgb_enc_destroy,
 170 };
 171
 172 int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
 173 {
 174         struct drm_encoder *encoder;
 175         struct drm_bridge *bridge;
 176         struct sun4i_rgb *rgb;
 177         int ret;
 178
 179         rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
 180         if (!rgb)
 181                 return -ENOMEM;
 182         rgb->tcon = tcon;
 183         encoder = &rgb->encoder;
 184
 185         ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
 186                                           &tcon->panel, &bridge);
 187         if (ret) {
 188                 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
 189                 return 0;
 190         }
 191
 192         drm_encoder_helper_add(&rgb->encoder,
 193                                &sun4i_rgb_enc_helper_funcs);
 194         ret = drm_encoder_init(drm,
 195                                &rgb->encoder,
 196                                &sun4i_rgb_enc_funcs,
 197                                DRM_MODE_ENCODER_NONE,
 198                                NULL);
 199         if (ret) {
 200                 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
 201                 goto err_out;
 202         }
 203
 204         /* The RGB encoder can only work with the TCON channel 0 */
 205         rgb->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
 206
 207         if (tcon->panel) {
 208                 drm_connector_helper_add(&rgb->connector,
 209                                          &sun4i_rgb_con_helper_funcs);
 210                 ret = drm_connector_init(drm, &rgb->connector,
 211                                          &sun4i_rgb_con_funcs,
 212                                          DRM_MODE_CONNECTOR_Unknown);
 213                 if (ret) {
 214                         dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
 215                         goto err_cleanup_connector;
 216                 }
 217
 218                 drm_connector_attach_encoder(&rgb->connector,
 219                                                   &rgb->encoder);
 220
 221                 ret = drm_panel_attach(tcon->panel, &rgb->connector);
 222                 if (ret) {
 223                         dev_err(drm->dev, "Couldn't attach our panel\n");
 224                         goto err_cleanup_connector;
 225                 }
 226         }
 227
 228         if (bridge) {
 229                 ret = drm_bridge_attach(encoder, bridge, NULL);
 230                 if (ret) {
 231                         dev_err(drm->dev, "Couldn't attach our bridge\n");
 232                         goto err_cleanup_connector;
 233                 }
 234         }
 235
 236         return 0;
 237
 238 err_cleanup_connector:
 239         drm_encoder_cleanup(&rgb->encoder);
 240 err_out:
 241         return ret;
 242 }
 243 EXPORT_SYMBOL(sun4i_rgb_init);