drivers/gpu/drm/meson/meson_venc_cvbs.c

   1 /*
   2  * Copyright (C) 2016 BayLibre, SAS
   3  * Author: Neil Armstrong <narmstrong@baylibre.com>
   4  * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
   5  * Copyright (C) 2014 Endless Mobile
   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 the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  *
  20  * Written by:
  21  *     Jasper St. Pierre <jstpierre@mecheye.net>
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/of_graph.h>
  27
  28 #include <drm/drmP.h>
  29 #include <drm/drm_edid.h>
  30 #include <drm/drm_crtc_helper.h>
  31 #include <drm/drm_atomic_helper.h>
  32
  33 #include "meson_venc_cvbs.h"
  34 #include "meson_venc.h"
  35 #include "meson_vclk.h"
  36 #include "meson_registers.h"
  37
  38 /* HHI VDAC Registers */
  39 #define HHI_VDAC_CNTL0          0x2F4 /* 0xbd offset in data sheet */
  40 #define HHI_VDAC_CNTL1          0x2F8 /* 0xbe offset in data sheet */
  41
  42 struct meson_venc_cvbs {
  43         struct drm_encoder      encoder;
  44         struct drm_connector    connector;
  45         struct meson_drm        *priv;
  46 };
  47 #define encoder_to_meson_venc_cvbs(x) \
  48         container_of(x, struct meson_venc_cvbs, encoder)
  49
  50 #define connector_to_meson_venc_cvbs(x) \
  51         container_of(x, struct meson_venc_cvbs, connector)
  52
  53 /* Supported Modes */
  54
  55 struct meson_cvbs_mode meson_cvbs_modes[MESON_CVBS_MODES_COUNT] = {
  56         { /* PAL */
  57                 .enci = &meson_cvbs_enci_pal,
  58                 .mode = {
  59                         DRM_MODE("720x576i", DRM_MODE_TYPE_DRIVER, 13500,
  60                                  720, 732, 795, 864, 0, 576, 580, 586, 625, 0,
  61                                  DRM_MODE_FLAG_INTERLACE),
  62                         .vrefresh = 50,
  63                         .picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
  64                 },
  65         },
  66         { /* NTSC */
  67                 .enci = &meson_cvbs_enci_ntsc,
  68                 .mode = {
  69                         DRM_MODE("720x480i", DRM_MODE_TYPE_DRIVER, 13500,
  70                                 720, 739, 801, 858, 0, 480, 488, 494, 525, 0,
  71                                 DRM_MODE_FLAG_INTERLACE),
  72                         .vrefresh = 60,
  73                         .picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
  74                 },
  75         },
  76 };
  77
  78 /* Connector */
  79
  80 static void meson_cvbs_connector_destroy(struct drm_connector *connector)
  81 {
  82         drm_connector_cleanup(connector);
  83 }
  84
  85 static enum drm_connector_status
  86 meson_cvbs_connector_detect(struct drm_connector *connector, bool force)
  87 {
  88         /* FIXME: Add load-detect or jack-detect if possible */
  89         return connector_status_connected;
  90 }
  91
  92 static int meson_cvbs_connector_get_modes(struct drm_connector *connector)
  93 {
  94         struct drm_device *dev = connector->dev;
  95         struct drm_display_mode *mode;
  96         int i;
  97
  98         for (i = 0; i < MESON_CVBS_MODES_COUNT; ++i) {
  99                 struct meson_cvbs_mode *meson_mode = &meson_cvbs_modes[i];
 100
 101                 mode = drm_mode_duplicate(dev, &meson_mode->mode);
 102                 if (!mode) {
 103                         DRM_ERROR("Failed to create a new display mode\n");
 104                         return 0;
 105                 }
 106
 107                 drm_mode_probed_add(connector, mode);
 108         }
 109
 110         return i;
 111 }
 112
 113 static int meson_cvbs_connector_mode_valid(struct drm_connector *connector,
 114                                            struct drm_display_mode *mode)
 115 {
 116         /* Validate the modes added in get_modes */
 117         return MODE_OK;
 118 }
 119
 120 static const struct drm_connector_funcs meson_cvbs_connector_funcs = {
 121         .dpms                   = drm_atomic_helper_connector_dpms,
 122         .detect                 = meson_cvbs_connector_detect,
 123         .fill_modes             = drm_helper_probe_single_connector_modes,
 124         .destroy                = meson_cvbs_connector_destroy,
 125         .reset                  = drm_atomic_helper_connector_reset,
 126         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 127         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 128 };
 129
 130 static const
 131 struct drm_connector_helper_funcs meson_cvbs_connector_helper_funcs = {
 132         .get_modes      = meson_cvbs_connector_get_modes,
 133         .mode_valid     = meson_cvbs_connector_mode_valid,
 134 };
 135
 136 /* Encoder */
 137
 138 static void meson_venc_cvbs_encoder_destroy(struct drm_encoder *encoder)
 139 {
 140         drm_encoder_cleanup(encoder);
 141 }
 142
 143 static const struct drm_encoder_funcs meson_venc_cvbs_encoder_funcs = {
 144         .destroy        = meson_venc_cvbs_encoder_destroy,
 145 };
 146
 147 static int meson_venc_cvbs_encoder_atomic_check(struct drm_encoder *encoder,
 148                                         struct drm_crtc_state *crtc_state,
 149                                         struct drm_connector_state *conn_state)
 150 {
 151         int i;
 152
 153         for (i = 0; i < MESON_CVBS_MODES_COUNT; ++i) {
 154                 struct meson_cvbs_mode *meson_mode = &meson_cvbs_modes[i];
 155
 156                 if (drm_mode_equal(&crtc_state->mode, &meson_mode->mode))
 157                         return 0;
 158         }
 159
 160         return -EINVAL;
 161 }
 162
 163 static void meson_venc_cvbs_encoder_disable(struct drm_encoder *encoder)
 164 {
 165         struct meson_venc_cvbs *meson_venc_cvbs =
 166                                         encoder_to_meson_venc_cvbs(encoder);
 167         struct meson_drm *priv = meson_venc_cvbs->priv;
 168
 169         /* Disable CVBS VDAC */
 170         regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0);
 171         regmap_write(priv->hhi, HHI_VDAC_CNTL1, 8);
 172 }
 173
 174 static void meson_venc_cvbs_encoder_enable(struct drm_encoder *encoder)
 175 {
 176         struct meson_venc_cvbs *meson_venc_cvbs =
 177                                         encoder_to_meson_venc_cvbs(encoder);
 178         struct meson_drm *priv = meson_venc_cvbs->priv;
 179
 180         /* VDAC0 source is not from ATV */
 181         writel_bits_relaxed(BIT(5), 0, priv->io_base + _REG(VENC_VDAC_DACSEL0));
 182
 183         if (meson_vpu_is_compatible(priv, "amlogic,meson-gxbb-vpu"))
 184                 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 1);
 185         else if (meson_vpu_is_compatible(priv, "amlogic,meson-gxm-vpu") ||
 186                  meson_vpu_is_compatible(priv, "amlogic,meson-gxl-vpu"))
 187                 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0xf0001);
 188
 189         regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
 190 }
 191
 192 static void meson_venc_cvbs_encoder_mode_set(struct drm_encoder *encoder,
 193                                    struct drm_display_mode *mode,
 194                                    struct drm_display_mode *adjusted_mode)
 195 {
 196         struct meson_venc_cvbs *meson_venc_cvbs =
 197                                         encoder_to_meson_venc_cvbs(encoder);
 198         struct meson_drm *priv = meson_venc_cvbs->priv;
 199         int i;
 200
 201         for (i = 0; i < MESON_CVBS_MODES_COUNT; ++i) {
 202                 struct meson_cvbs_mode *meson_mode = &meson_cvbs_modes[i];
 203
 204                 if (drm_mode_equal(mode, &meson_mode->mode)) {
 205                         meson_venci_cvbs_mode_set(priv,
 206                                                   meson_mode->enci);
 207
 208                         /* Setup 27MHz vclk2 for ENCI and VDAC */
 209                         meson_vclk_setup(priv, MESON_VCLK_TARGET_CVBS,
 210                                          MESON_VCLK_CVBS, MESON_VCLK_CVBS,
 211                                          MESON_VCLK_CVBS, true);
 212                         break;
 213                 }
 214         }
 215 }
 216
 217 static const struct drm_encoder_helper_funcs
 218                                 meson_venc_cvbs_encoder_helper_funcs = {
 219         .atomic_check   = meson_venc_cvbs_encoder_atomic_check,
 220         .disable        = meson_venc_cvbs_encoder_disable,
 221         .enable         = meson_venc_cvbs_encoder_enable,
 222         .mode_set       = meson_venc_cvbs_encoder_mode_set,
 223 };
 224
 225 static bool meson_venc_cvbs_connector_is_available(struct meson_drm *priv)
 226 {
 227         struct device_node *remote;
 228
 229         remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
 230         if (!remote)
 231                 return false;
 232
 233         of_node_put(remote);
 234         return true;
 235 }
 236
 237 int meson_venc_cvbs_create(struct meson_drm *priv)
 238 {
 239         struct drm_device *drm = priv->drm;
 240         struct meson_venc_cvbs *meson_venc_cvbs;
 241         struct drm_connector *connector;
 242         struct drm_encoder *encoder;
 243         int ret;
 244
 245         if (!meson_venc_cvbs_connector_is_available(priv)) {
 246                 dev_info(drm->dev, "CVBS Output connector not available\n");
 247                 return 0;
 248         }
 249
 250         meson_venc_cvbs = devm_kzalloc(priv->dev, sizeof(*meson_venc_cvbs),
 251                                        GFP_KERNEL);
 252         if (!meson_venc_cvbs)
 253                 return -ENOMEM;
 254
 255         meson_venc_cvbs->priv = priv;
 256         encoder = &meson_venc_cvbs->encoder;
 257         connector = &meson_venc_cvbs->connector;
 258
 259         /* Connector */
 260
 261         drm_connector_helper_add(connector,
 262                                  &meson_cvbs_connector_helper_funcs);
 263
 264         ret = drm_connector_init(drm, connector, &meson_cvbs_connector_funcs,
 265                                  DRM_MODE_CONNECTOR_Composite);
 266         if (ret) {
 267                 dev_err(priv->dev, "Failed to init CVBS connector\n");
 268                 return ret;
 269         }
 270
 271         connector->interlace_allowed = 1;
 272
 273         /* Encoder */
 274
 275         drm_encoder_helper_add(encoder, &meson_venc_cvbs_encoder_helper_funcs);
 276
 277         ret = drm_encoder_init(drm, encoder, &meson_venc_cvbs_encoder_funcs,
 278                                DRM_MODE_ENCODER_TVDAC, "meson_venc_cvbs");
 279         if (ret) {
 280                 dev_err(priv->dev, "Failed to init CVBS encoder\n");
 281                 return ret;
 282         }
 283
 284         encoder->possible_crtcs = BIT(0);
 285
 286         drm_mode_connector_attach_encoder(connector, encoder);
 287
 288         return 0;
 289 }