drivers/gpu/drm/bridge/imx/imx-ldb-helper.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   4  * Copyright 2019,2020,2022 NXP
   5  */
   6
   7 #include <linux/export.h>
   8 #include <linux/media-bus-format.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/regmap.h>
  13
  14 #include <drm/drm_bridge.h>
  15 #include <drm/drm_of.h>
  16 #include <drm/drm_print.h>
  17
  18 #include "imx-ldb-helper.h"
  19
  20 bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch)
  21 {
  22         return ldb_ch->link_type == LDB_CH_SINGLE_LINK;
  23 }
  24 EXPORT_SYMBOL_GPL(ldb_channel_is_single_link);
  25
  26 bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch)
  27 {
  28         return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS ||
  29                ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
  30 }
  31 EXPORT_SYMBOL_GPL(ldb_channel_is_split_link);
  32
  33 int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
  34                                    struct drm_bridge_state *bridge_state,
  35                                    struct drm_crtc_state *crtc_state,
  36                                    struct drm_connector_state *conn_state)
  37 {
  38         struct ldb_channel *ldb_ch = bridge->driver_private;
  39
  40         ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format;
  41         ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format;
  42
  43         return 0;
  44 }
  45 EXPORT_SYMBOL_GPL(ldb_bridge_atomic_check_helper);
  46
  47 void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
  48                                 const struct drm_display_mode *mode,
  49                                 const struct drm_display_mode *adjusted_mode)
  50 {
  51         struct ldb_channel *ldb_ch = bridge->driver_private;
  52         struct ldb *ldb = ldb_ch->ldb;
  53         bool is_split = ldb_channel_is_split_link(ldb_ch);
  54
  55         if (is_split)
  56                 ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
  57
  58         switch (ldb_ch->out_bus_format) {
  59         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
  60                 break;
  61         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
  62                 if (ldb_ch->chno == 0 || is_split)
  63                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
  64                 if (ldb_ch->chno == 1 || is_split)
  65                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
  66                 break;
  67         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
  68                 if (ldb_ch->chno == 0 || is_split)
  69                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
  70                                          LDB_BIT_MAP_CH0_JEIDA;
  71                 if (ldb_ch->chno == 1 || is_split)
  72                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
  73                                          LDB_BIT_MAP_CH1_JEIDA;
  74                 break;
  75         }
  76 }
  77 EXPORT_SYMBOL_GPL(ldb_bridge_mode_set_helper);
  78
  79 void ldb_bridge_enable_helper(struct drm_bridge *bridge)
  80 {
  81         struct ldb_channel *ldb_ch = bridge->driver_private;
  82         struct ldb *ldb = ldb_ch->ldb;
  83
  84         /*
  85          * Platform specific bridge drivers should set ldb_ctrl properly
  86          * for the enablement, so just write the ctrl_reg here.
  87          */
  88         regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
  89 }
  90 EXPORT_SYMBOL_GPL(ldb_bridge_enable_helper);
  91
  92 void ldb_bridge_disable_helper(struct drm_bridge *bridge)
  93 {
  94         struct ldb_channel *ldb_ch = bridge->driver_private;
  95         struct ldb *ldb = ldb_ch->ldb;
  96         bool is_split = ldb_channel_is_split_link(ldb_ch);
  97
  98         if (ldb_ch->chno == 0 || is_split)
  99                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 100         if (ldb_ch->chno == 1 || is_split)
 101                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 102
 103         regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
 104 }
 105 EXPORT_SYMBOL_GPL(ldb_bridge_disable_helper);
 106
 107 int ldb_bridge_attach_helper(struct drm_bridge *bridge,
 108                              enum drm_bridge_attach_flags flags)
 109 {
 110         struct ldb_channel *ldb_ch = bridge->driver_private;
 111         struct ldb *ldb = ldb_ch->ldb;
 112
 113         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 114                 DRM_DEV_ERROR(ldb->dev,
 115                               "do not support creating a drm_connector\n");
 116                 return -EINVAL;
 117         }
 118
 119         if (!bridge->encoder) {
 120                 DRM_DEV_ERROR(ldb->dev, "missing encoder\n");
 121                 return -ENODEV;
 122         }
 123
 124         return drm_bridge_attach(bridge->encoder,
 125                                 ldb_ch->next_bridge, bridge,
 126                                 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 127 }
 128 EXPORT_SYMBOL_GPL(ldb_bridge_attach_helper);
 129
 130 int ldb_init_helper(struct ldb *ldb)
 131 {
 132         struct device *dev = ldb->dev;
 133         struct device_node *np = dev->of_node;
 134         struct device_node *child;
 135         int ret;
 136         u32 i;
 137
 138         ldb->regmap = syscon_node_to_regmap(np->parent);
 139         if (IS_ERR(ldb->regmap)) {
 140                 ret = PTR_ERR(ldb->regmap);
 141                 if (ret != -EPROBE_DEFER)
 142                         DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
 143                 return ret;
 144         }
 145
 146         for_each_available_child_of_node(np, child) {
 147                 struct ldb_channel *ldb_ch;
 148
 149                 ret = of_property_read_u32(child, "reg", &i);
 150                 if (ret || i > MAX_LDB_CHAN_NUM - 1) {
 151                         ret = -EINVAL;
 152                         DRM_DEV_ERROR(dev,
 153                                       "invalid channel node address: %u\n", i);
 154                         of_node_put(child);
 155                         return ret;
 156                 }
 157
 158                 ldb_ch = ldb->channel[i];
 159                 ldb_ch->ldb = ldb;
 160                 ldb_ch->chno = i;
 161                 ldb_ch->is_available = true;
 162                 ldb_ch->np = child;
 163
 164                 ldb->available_ch_cnt++;
 165         }
 166
 167         return 0;
 168 }
 169 EXPORT_SYMBOL_GPL(ldb_init_helper);
 170
 171 int ldb_find_next_bridge_helper(struct ldb *ldb)
 172 {
 173         struct device *dev = ldb->dev;
 174         struct ldb_channel *ldb_ch;
 175         int ret, i;
 176
 177         for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
 178                 ldb_ch = ldb->channel[i];
 179
 180                 if (!ldb_ch->is_available)
 181                         continue;
 182
 183                 ldb_ch->next_bridge = devm_drm_of_get_bridge(dev, ldb_ch->np,
 184                                                              1, 0);
 185                 if (IS_ERR(ldb_ch->next_bridge)) {
 186                         ret = PTR_ERR(ldb_ch->next_bridge);
 187                         if (ret != -EPROBE_DEFER)
 188                                 DRM_DEV_ERROR(dev,
 189                                               "failed to get next bridge: %d\n",
 190                                               ret);
 191                         return ret;
 192                 }
 193         }
 194
 195         return 0;
 196 }
 197 EXPORT_SYMBOL_GPL(ldb_find_next_bridge_helper);
 198
 199 void ldb_add_bridge_helper(struct ldb *ldb,
 200                            const struct drm_bridge_funcs *bridge_funcs)
 201 {
 202         struct ldb_channel *ldb_ch;
 203         int i;
 204
 205         for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
 206                 ldb_ch = ldb->channel[i];
 207
 208                 if (!ldb_ch->is_available)
 209                         continue;
 210
 211                 ldb_ch->bridge.driver_private = ldb_ch;
 212                 ldb_ch->bridge.funcs = bridge_funcs;
 213                 ldb_ch->bridge.of_node = ldb_ch->np;
 214
 215                 drm_bridge_add(&ldb_ch->bridge);
 216         }
 217 }
 218 EXPORT_SYMBOL_GPL(ldb_add_bridge_helper);
 219
 220 void ldb_remove_bridge_helper(struct ldb *ldb)
 221 {
 222         struct ldb_channel *ldb_ch;
 223         int i;
 224
 225         for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
 226                 ldb_ch = ldb->channel[i];
 227
 228                 if (!ldb_ch->is_available)
 229                         continue;
 230
 231                 drm_bridge_remove(&ldb_ch->bridge);
 232         }
 233 }
 234 EXPORT_SYMBOL_GPL(ldb_remove_bridge_helper);
 235
 236 MODULE_DESCRIPTION("i.MX8 LVDS Display Bridge(LDB)/Pixel Mapper bridge helper");
 237 MODULE_AUTHOR("Liu Ying <[email protected]>");
 238 MODULE_LICENSE("GPL");