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