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