drivers/gpu/drm/exynos/exynos_drm_dpi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Exynos DRM Parallel output support.
   4  *
   5  * Copyright (c) 2014 Samsung Electronics Co., Ltd
   6  *
   7  * Contacts: Andrzej Hajda <[email protected]>
   8 */
   9
  10 #include <linux/of.h>
  11 #include <linux/of_graph.h>
  12 #include <linux/regulator/consumer.h>
  13
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_panel.h>
  16 #include <drm/drm_print.h>
  17 #include <drm/drm_probe_helper.h>
  18 #include <drm/drm_simple_kms_helper.h>
  19
  20 #include <video/of_videomode.h>
  21 #include <video/videomode.h>
  22
  23 #include "exynos_drm_crtc.h"
  24
  25 struct exynos_dpi {
  26         struct drm_encoder encoder;
  27         struct device *dev;
  28         struct device_node *panel_node;
  29
  30         struct drm_panel *panel;
  31         struct drm_connector connector;
  32
  33         struct videomode *vm;
  34 };
  35
  36 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
  37
  38 static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
  39 {
  40         return container_of(e, struct exynos_dpi, encoder);
  41 }
  42
  43 static enum drm_connector_status
  44 exynos_dpi_detect(struct drm_connector *connector, bool force)
  45 {
  46         return connector_status_connected;
  47 }
  48
  49 static void exynos_dpi_connector_destroy(struct drm_connector *connector)
  50 {
  51         drm_connector_unregister(connector);
  52         drm_connector_cleanup(connector);
  53 }
  54
  55 static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
  56         .detect = exynos_dpi_detect,
  57         .fill_modes = drm_helper_probe_single_connector_modes,
  58         .destroy = exynos_dpi_connector_destroy,
  59         .reset = drm_atomic_helper_connector_reset,
  60         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  61         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  62 };
  63
  64 static int exynos_dpi_get_modes(struct drm_connector *connector)
  65 {
  66         struct exynos_dpi *ctx = connector_to_dpi(connector);
  67
  68         /* fimd timings gets precedence over panel modes */
  69         if (ctx->vm) {
  70                 struct drm_display_mode *mode;
  71
  72                 mode = drm_mode_create(connector->dev);
  73                 if (!mode) {
  74                         DRM_DEV_ERROR(ctx->dev,
  75                                       "failed to create a new display mode\n");
  76                         return 0;
  77                 }
  78                 drm_display_mode_from_videomode(ctx->vm, mode);
  79                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  80                 drm_mode_probed_add(connector, mode);
  81                 return 1;
  82         }
  83
  84         if (ctx->panel)
  85                 return drm_panel_get_modes(ctx->panel, connector);
  86
  87         return 0;
  88 }
  89
  90 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
  91         .get_modes = exynos_dpi_get_modes,
  92 };
  93
  94 static int exynos_dpi_create_connector(struct drm_encoder *encoder)
  95 {
  96         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
  97         struct drm_connector *connector = &ctx->connector;
  98         int ret;
  99
 100         connector->polled = DRM_CONNECTOR_POLL_HPD;
 101
 102         ret = drm_connector_init(encoder->dev, connector,
 103                                  &exynos_dpi_connector_funcs,
 104                                  DRM_MODE_CONNECTOR_VGA);
 105         if (ret) {
 106                 DRM_DEV_ERROR(ctx->dev,
 107                               "failed to initialize connector with drm\n");
 108                 return ret;
 109         }
 110
 111         drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
 112         drm_connector_attach_encoder(connector, encoder);
 113
 114         return 0;
 115 }
 116
 117 static void exynos_dpi_mode_set(struct drm_encoder *encoder,
 118                                 struct drm_display_mode *mode,
 119                                 struct drm_display_mode *adjusted_mode)
 120 {
 121 }
 122
 123 static void exynos_dpi_enable(struct drm_encoder *encoder)
 124 {
 125         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 126
 127         if (ctx->panel) {
 128                 drm_panel_prepare(ctx->panel);
 129                 drm_panel_enable(ctx->panel);
 130         }
 131 }
 132
 133 static void exynos_dpi_disable(struct drm_encoder *encoder)
 134 {
 135         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 136
 137         if (ctx->panel) {
 138                 drm_panel_disable(ctx->panel);
 139                 drm_panel_unprepare(ctx->panel);
 140         }
 141 }
 142
 143 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
 144         .mode_set = exynos_dpi_mode_set,
 145         .enable = exynos_dpi_enable,
 146         .disable = exynos_dpi_disable,
 147 };
 148
 149 enum {
 150         FIMD_PORT_IN0,
 151         FIMD_PORT_IN1,
 152         FIMD_PORT_IN2,
 153         FIMD_PORT_RGB,
 154         FIMD_PORT_WRB,
 155 };
 156
 157 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 158 {
 159         struct device *dev = ctx->dev;
 160         struct device_node *dn = dev->of_node;
 161         struct device_node *np;
 162
 163         ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
 164
 165         np = of_get_child_by_name(dn, "display-timings");
 166         if (np) {
 167                 struct videomode *vm;
 168                 int ret;
 169
 170                 of_node_put(np);
 171
 172                 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
 173                 if (!vm)
 174                         return -ENOMEM;
 175
 176                 ret = of_get_videomode(dn, vm, 0);
 177                 if (ret < 0) {
 178                         devm_kfree(dev, vm);
 179                         return ret;
 180                 }
 181
 182                 ctx->vm = vm;
 183
 184                 return 0;
 185         }
 186
 187         if (!ctx->panel_node)
 188                 return -EINVAL;
 189
 190         return 0;
 191 }
 192
 193 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
 194 {
 195         int ret;
 196
 197         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
 198
 199         drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
 200
 201         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 202         if (ret < 0)
 203                 return ret;
 204
 205         ret = exynos_dpi_create_connector(encoder);
 206         if (ret) {
 207                 DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
 208                               "failed to create connector ret = %d\n", ret);
 209                 drm_encoder_cleanup(encoder);
 210                 return ret;
 211         }
 212
 213         return 0;
 214 }
 215
 216 struct drm_encoder *exynos_dpi_probe(struct device *dev)
 217 {
 218         struct exynos_dpi *ctx;
 219         int ret;
 220
 221         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 222         if (!ctx)
 223                 return ERR_PTR(-ENOMEM);
 224
 225         ctx->dev = dev;
 226
 227         ret = exynos_dpi_parse_dt(ctx);
 228         if (ret < 0) {
 229                 devm_kfree(dev, ctx);
 230                 return NULL;
 231         }
 232
 233         if (ctx->panel_node) {
 234                 ctx->panel = of_drm_find_panel(ctx->panel_node);
 235                 if (IS_ERR(ctx->panel))
 236                         return ERR_CAST(ctx->panel);
 237         }
 238
 239         return &ctx->encoder;
 240 }
 241
 242 int exynos_dpi_remove(struct drm_encoder *encoder)
 243 {
 244         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 245
 246         exynos_dpi_disable(&ctx->encoder);
 247
 248         return 0;
 249 }