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_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         struct exynos_dpi *ctx = connector_to_dpi(connector);
  46
  47         if (ctx->panel)
  48                 drm_panel_attach(ctx->panel, &ctx->connector);
  49
  50         return connector_status_connected;
  51 }
  52
  53 static void exynos_dpi_connector_destroy(struct drm_connector *connector)
  54 {
  55         drm_connector_unregister(connector);
  56         drm_connector_cleanup(connector);
  57 }
  58
  59 static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
  60         .detect = exynos_dpi_detect,
  61         .fill_modes = drm_helper_probe_single_connector_modes,
  62         .destroy = exynos_dpi_connector_destroy,
  63         .reset = drm_atomic_helper_connector_reset,
  64         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  65         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  66 };
  67
  68 static int exynos_dpi_get_modes(struct drm_connector *connector)
  69 {
  70         struct exynos_dpi *ctx = connector_to_dpi(connector);
  71
  72         /* fimd timings gets precedence over panel modes */
  73         if (ctx->vm) {
  74                 struct drm_display_mode *mode;
  75
  76                 mode = drm_mode_create(connector->dev);
  77                 if (!mode) {
  78                         DRM_DEV_ERROR(ctx->dev,
  79                                       "failed to create a new display mode\n");
  80                         return 0;
  81                 }
  82                 drm_display_mode_from_videomode(ctx->vm, mode);
  83                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  84                 drm_mode_probed_add(connector, mode);
  85                 return 1;
  86         }
  87
  88         if (ctx->panel)
  89                 return drm_panel_get_modes(ctx->panel, connector);
  90
  91         return 0;
  92 }
  93
  94 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
  95         .get_modes = exynos_dpi_get_modes,
  96 };
  97
  98 static int exynos_dpi_create_connector(struct drm_encoder *encoder)
  99 {
 100         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 101         struct drm_connector *connector = &ctx->connector;
 102         int ret;
 103
 104         connector->polled = DRM_CONNECTOR_POLL_HPD;
 105
 106         ret = drm_connector_init(encoder->dev, connector,
 107                                  &exynos_dpi_connector_funcs,
 108                                  DRM_MODE_CONNECTOR_VGA);
 109         if (ret) {
 110                 DRM_DEV_ERROR(ctx->dev,
 111                               "failed to initialize connector with drm\n");
 112                 return ret;
 113         }
 114
 115         drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
 116         drm_connector_attach_encoder(connector, encoder);
 117
 118         return 0;
 119 }
 120
 121 static void exynos_dpi_mode_set(struct drm_encoder *encoder,
 122                                 struct drm_display_mode *mode,
 123                                 struct drm_display_mode *adjusted_mode)
 124 {
 125 }
 126
 127 static void exynos_dpi_enable(struct drm_encoder *encoder)
 128 {
 129         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 130
 131         if (ctx->panel) {
 132                 drm_panel_prepare(ctx->panel);
 133                 drm_panel_enable(ctx->panel);
 134         }
 135 }
 136
 137 static void exynos_dpi_disable(struct drm_encoder *encoder)
 138 {
 139         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 140
 141         if (ctx->panel) {
 142                 drm_panel_disable(ctx->panel);
 143                 drm_panel_unprepare(ctx->panel);
 144         }
 145 }
 146
 147 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
 148         .mode_set = exynos_dpi_mode_set,
 149         .enable = exynos_dpi_enable,
 150         .disable = exynos_dpi_disable,
 151 };
 152
 153 enum {
 154         FIMD_PORT_IN0,
 155         FIMD_PORT_IN1,
 156         FIMD_PORT_IN2,
 157         FIMD_PORT_RGB,
 158         FIMD_PORT_WRB,
 159 };
 160
 161 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 162 {
 163         struct device *dev = ctx->dev;
 164         struct device_node *dn = dev->of_node;
 165         struct device_node *np;
 166
 167         ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
 168
 169         np = of_get_child_by_name(dn, "display-timings");
 170         if (np) {
 171                 struct videomode *vm;
 172                 int ret;
 173
 174                 of_node_put(np);
 175
 176                 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
 177                 if (!vm)
 178                         return -ENOMEM;
 179
 180                 ret = of_get_videomode(dn, vm, 0);
 181                 if (ret < 0) {
 182                         devm_kfree(dev, vm);
 183                         return ret;
 184                 }
 185
 186                 ctx->vm = vm;
 187
 188                 return 0;
 189         }
 190
 191         if (!ctx->panel_node)
 192                 return -EINVAL;
 193
 194         return 0;
 195 }
 196
 197 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
 198 {
 199         int ret;
 200
 201         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
 202
 203         drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
 204
 205         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 206         if (ret < 0)
 207                 return ret;
 208
 209         ret = exynos_dpi_create_connector(encoder);
 210         if (ret) {
 211                 DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
 212                               "failed to create connector ret = %d\n", ret);
 213                 drm_encoder_cleanup(encoder);
 214                 return ret;
 215         }
 216
 217         return 0;
 218 }
 219
 220 struct drm_encoder *exynos_dpi_probe(struct device *dev)
 221 {
 222         struct exynos_dpi *ctx;
 223         int ret;
 224
 225         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 226         if (!ctx)
 227                 return ERR_PTR(-ENOMEM);
 228
 229         ctx->dev = dev;
 230
 231         ret = exynos_dpi_parse_dt(ctx);
 232         if (ret < 0) {
 233                 devm_kfree(dev, ctx);
 234                 return NULL;
 235         }
 236
 237         if (ctx->panel_node) {
 238                 ctx->panel = of_drm_find_panel(ctx->panel_node);
 239                 if (IS_ERR(ctx->panel))
 240                         return ERR_CAST(ctx->panel);
 241         }
 242
 243         return &ctx->encoder;
 244 }
 245
 246 int exynos_dpi_remove(struct drm_encoder *encoder)
 247 {
 248         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 249
 250         exynos_dpi_disable(&ctx->encoder);
 251
 252         if (ctx->panel)
 253                 drm_panel_detach(ctx->panel);
 254
 255         return 0;
 256 }