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         struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
  58         struct sun4i_drv *drv = rgb->drv;
  59         struct sun4i_tcon *tcon = drv->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_encoder *
 108 sun4i_rgb_best_encoder(struct drm_connector *connector)
 109 {
 110         struct sun4i_rgb *rgb =
 111                 drm_connector_to_sun4i_rgb(connector);
 112
 113         return &rgb->encoder;
 114 }
 115
 116 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
 117         .get_modes      = sun4i_rgb_get_modes,
 118         .mode_valid     = sun4i_rgb_mode_valid,
 119         .best_encoder   = sun4i_rgb_best_encoder,
 120 };
 121
 122 static enum drm_connector_status
 123 sun4i_rgb_connector_detect(struct drm_connector *connector, bool force)
 124 {
 125         return connector_status_connected;
 126 }
 127
 128 static void
 129 sun4i_rgb_connector_destroy(struct drm_connector *connector)
 130 {
 131         struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
 132         struct sun4i_drv *drv = rgb->drv;
 133         struct sun4i_tcon *tcon = drv->tcon;
 134
 135         drm_panel_detach(tcon->panel);
 136         drm_connector_cleanup(connector);
 137 }
 138
 139 static struct drm_connector_funcs sun4i_rgb_con_funcs = {
 140         .dpms                   = drm_atomic_helper_connector_dpms,
 141         .detect                 = sun4i_rgb_connector_detect,
 142         .fill_modes             = drm_helper_probe_single_connector_modes,
 143         .destroy                = sun4i_rgb_connector_destroy,
 144         .reset                  = drm_atomic_helper_connector_reset,
 145         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 146         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 147 };
 148
 149 static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
 150                                   struct drm_crtc_state *crtc_state,
 151                                   struct drm_connector_state *conn_state)
 152 {
 153         return 0;
 154 }
 155
 156 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
 157 {
 158         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 159         struct sun4i_drv *drv = rgb->drv;
 160         struct sun4i_tcon *tcon = drv->tcon;
 161
 162         DRM_DEBUG_DRIVER("Enabling RGB output\n");
 163
 164         drm_panel_enable(tcon->panel);
 165         sun4i_tcon_channel_enable(tcon, 0);
 166 }
 167
 168 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
 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         DRM_DEBUG_DRIVER("Disabling RGB output\n");
 175
 176         sun4i_tcon_channel_disable(tcon, 0);
 177         drm_panel_disable(tcon->panel);
 178 }
 179
 180 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
 181                                        struct drm_display_mode *mode,
 182                                        struct drm_display_mode *adjusted_mode)
 183 {
 184         struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
 185         struct sun4i_drv *drv = rgb->drv;
 186         struct sun4i_tcon *tcon = drv->tcon;
 187
 188         sun4i_tcon0_mode_set(tcon, mode);
 189
 190         clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
 191
 192         /* FIXME: This seems to be board specific */
 193         clk_set_phase(tcon->dclk, 120);
 194 }
 195
 196 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
 197         .atomic_check   = sun4i_rgb_atomic_check,
 198         .mode_set       = sun4i_rgb_encoder_mode_set,
 199         .disable        = sun4i_rgb_encoder_disable,
 200         .enable         = sun4i_rgb_encoder_enable,
 201 };
 202
 203 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
 204 {
 205         drm_encoder_cleanup(encoder);
 206 }
 207
 208 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
 209         .destroy        = sun4i_rgb_enc_destroy,
 210 };
 211
 212 int sun4i_rgb_init(struct drm_device *drm)
 213 {
 214         struct sun4i_drv *drv = drm->dev_private;
 215         struct sun4i_tcon *tcon = drv->tcon;
 216         struct sun4i_rgb *rgb;
 217         int ret;
 218
 219         /* If we don't have a panel, there's no point in going on */
 220         if (IS_ERR(tcon->panel))
 221                 return -ENODEV;
 222
 223         rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
 224         if (!rgb)
 225                 return -ENOMEM;
 226         rgb->drv = drv;
 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         drm_connector_helper_add(&rgb->connector,
 244                                  &sun4i_rgb_con_helper_funcs);
 245         ret = drm_connector_init(drm, &rgb->connector,
 246                                  &sun4i_rgb_con_funcs,
 247                                  DRM_MODE_CONNECTOR_Unknown);
 248         if (ret) {
 249                 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
 250                 goto err_cleanup_connector;
 251         }
 252
 253         drm_mode_connector_attach_encoder(&rgb->connector, &rgb->encoder);
 254
 255         drm_panel_attach(tcon->panel, &rgb->connector);
 256
 257         return 0;
 258
 259 err_cleanup_connector:
 260         drm_encoder_cleanup(&rgb->encoder);
 261 err_out:
 262         return ret;
 263 }
 264 EXPORT_SYMBOL(sun4i_rgb_init);