drivers/gpu/drm/imx/parallel-display.c

   1 /*
   2  * i.MX drm driver - parallel display implementation
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  */
  20
  21 #include <linux/component.h>
  22 #include <linux/module.h>
  23 #include <drm/drmP.h>
  24 #include <drm/drm_fb_helper.h>
  25 #include <drm/drm_crtc_helper.h>
  26 #include <drm/drm_panel.h>
  27 #include <linux/videodev2.h>
  28 #include <video/of_display_timing.h>
  29
  30 #include "imx-drm.h"
  31
  32 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  33 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
  34
  35 struct imx_parallel_display {
  36         struct drm_connector connector;
  37         struct drm_encoder encoder;
  38         struct device *dev;
  39         void *edid;
  40         int edid_len;
  41         u32 interface_pix_fmt;
  42         int mode_valid;
  43         struct drm_display_mode mode;
  44         struct drm_panel *panel;
  45 };
  46
  47 static enum drm_connector_status imx_pd_connector_detect(
  48                 struct drm_connector *connector, bool force)
  49 {
  50         return connector_status_connected;
  51 }
  52
  53 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  54 {
  55         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  56         struct device_node *np = imxpd->dev->of_node;
  57         int num_modes = 0;
  58
  59         if (imxpd->panel && imxpd->panel->funcs &&
  60             imxpd->panel->funcs->get_modes) {
  61                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  62                 if (num_modes > 0)
  63                         return num_modes;
  64         }
  65
  66         if (imxpd->edid) {
  67                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  68                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  69         }
  70
  71         if (imxpd->mode_valid) {
  72                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  73
  74                 if (!mode)
  75                         return -EINVAL;
  76                 drm_mode_copy(mode, &imxpd->mode);
  77                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  78                 drm_mode_probed_add(connector, mode);
  79                 num_modes++;
  80         }
  81
  82         if (np) {
  83                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  84
  85                 if (!mode)
  86                         return -EINVAL;
  87                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  88                 drm_mode_copy(mode, &imxpd->mode);
  89                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  90                 drm_mode_probed_add(connector, mode);
  91                 num_modes++;
  92         }
  93
  94         return num_modes;
  95 }
  96
  97 static struct drm_encoder *imx_pd_connector_best_encoder(
  98                 struct drm_connector *connector)
  99 {
 100         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 101
 102         return &imxpd->encoder;
 103 }
 104
 105 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 106 {
 107         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 108
 109         if (mode != DRM_MODE_DPMS_ON)
 110                 drm_panel_disable(imxpd->panel);
 111         else
 112                 drm_panel_enable(imxpd->panel);
 113 }
 114
 115 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 116                            const struct drm_display_mode *mode,
 117                            struct drm_display_mode *adjusted_mode)
 118 {
 119         return true;
 120 }
 121
 122 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 123 {
 124         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 125
 126         imx_drm_panel_format(encoder, imxpd->interface_pix_fmt);
 127 }
 128
 129 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 130 {
 131 }
 132
 133 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 134                          struct drm_display_mode *mode,
 135                          struct drm_display_mode *adjusted_mode)
 136 {
 137 }
 138
 139 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 140 {
 141 }
 142
 143 static struct drm_connector_funcs imx_pd_connector_funcs = {
 144         .dpms = drm_helper_connector_dpms,
 145         .fill_modes = drm_helper_probe_single_connector_modes,
 146         .detect = imx_pd_connector_detect,
 147         .destroy = imx_drm_connector_destroy,
 148 };
 149
 150 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 151         .get_modes = imx_pd_connector_get_modes,
 152         .best_encoder = imx_pd_connector_best_encoder,
 153 };
 154
 155 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 156         .destroy = imx_drm_encoder_destroy,
 157 };
 158
 159 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 160         .dpms = imx_pd_encoder_dpms,
 161         .mode_fixup = imx_pd_encoder_mode_fixup,
 162         .prepare = imx_pd_encoder_prepare,
 163         .commit = imx_pd_encoder_commit,
 164         .mode_set = imx_pd_encoder_mode_set,
 165         .disable = imx_pd_encoder_disable,
 166 };
 167
 168 static int imx_pd_register(struct drm_device *drm,
 169         struct imx_parallel_display *imxpd)
 170 {
 171         int ret;
 172
 173         ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
 174                                        imxpd->dev->of_node);
 175         if (ret)
 176                 return ret;
 177
 178         /* set the connector's dpms to OFF so that
 179          * drm_helper_connector_dpms() won't return
 180          * immediately since the current state is ON
 181          * at this point.
 182          */
 183         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 184
 185         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 186         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 187                          DRM_MODE_ENCODER_NONE);
 188
 189         drm_connector_helper_add(&imxpd->connector,
 190                         &imx_pd_connector_helper_funcs);
 191         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 192                            DRM_MODE_CONNECTOR_VGA);
 193
 194         if (imxpd->panel)
 195                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 196
 197         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 198
 199         imxpd->connector.encoder = &imxpd->encoder;
 200
 201         return 0;
 202 }
 203
 204 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 205 {
 206         struct drm_device *drm = data;
 207         struct device_node *np = dev->of_node;
 208         struct device_node *panel_node;
 209         const u8 *edidp;
 210         struct imx_parallel_display *imxpd;
 211         int ret;
 212         const char *fmt;
 213
 214         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 215         if (!imxpd)
 216                 return -ENOMEM;
 217
 218         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 219         if (edidp)
 220                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 221
 222         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 223         if (!ret) {
 224                 if (!strcmp(fmt, "rgb24"))
 225                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
 226                 else if (!strcmp(fmt, "rgb565"))
 227                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
 228                 else if (!strcmp(fmt, "bgr666"))
 229                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
 230                 else if (!strcmp(fmt, "lvds666"))
 231                         imxpd->interface_pix_fmt =
 232                                         v4l2_fourcc('L', 'V', 'D', '6');
 233         }
 234
 235         panel_node = of_parse_phandle(np, "fsl,panel", 0);
 236         if (panel_node)
 237                 imxpd->panel = of_drm_find_panel(panel_node);
 238
 239         imxpd->dev = dev;
 240
 241         ret = imx_pd_register(drm, imxpd);
 242         if (ret)
 243                 return ret;
 244
 245         dev_set_drvdata(dev, imxpd);
 246
 247         return 0;
 248 }
 249
 250 static void imx_pd_unbind(struct device *dev, struct device *master,
 251         void *data)
 252 {
 253         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 254
 255         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 256         imxpd->connector.funcs->destroy(&imxpd->connector);
 257 }
 258
 259 static const struct component_ops imx_pd_ops = {
 260         .bind   = imx_pd_bind,
 261         .unbind = imx_pd_unbind,
 262 };
 263
 264 static int imx_pd_probe(struct platform_device *pdev)
 265 {
 266         return component_add(&pdev->dev, &imx_pd_ops);
 267 }
 268
 269 static int imx_pd_remove(struct platform_device *pdev)
 270 {
 271         component_del(&pdev->dev, &imx_pd_ops);
 272         return 0;
 273 }
 274
 275 static const struct of_device_id imx_pd_dt_ids[] = {
 276         { .compatible = "fsl,imx-parallel-display", },
 277         { /* sentinel */ }
 278 };
 279 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 280
 281 static struct platform_driver imx_pd_driver = {
 282         .probe          = imx_pd_probe,
 283         .remove         = imx_pd_remove,
 284         .driver         = {
 285                 .of_match_table = imx_pd_dt_ids,
 286                 .name   = "imx-parallel-display",
 287         },
 288 };
 289
 290 module_platform_driver(imx_pd_driver);
 291
 292 MODULE_DESCRIPTION("i.MX parallel display driver");
 293 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 294 MODULE_LICENSE("GPL");
 295 MODULE_ALIAS("platform:imx-parallel-display");