drivers/video/rockchip/rk_lvds.c

   1 /*
   2  * Copyright 2016 Rockchip Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <display.h>
   9 #include <dm.h>
  10 #include <edid.h>
  11 #include <panel.h>
  12 #include <regmap.h>
  13 #include <syscon.h>
  14 #include <asm/gpio.h>
  15 #include <asm/io.h>
  16 #include <asm/arch/clock.h>
  17 #include <asm/arch/lvds_rk3288.h>
  18 #include <asm/arch/grf_rk3288.h>
  19 #include <dt-bindings/clock/rk3288-cru.h>
  20 #include <dt-bindings/video/rk3288.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 /**
  25  * struct rk_lvds_priv - private rockchip lvds display driver info
  26  *
  27  * @reg: LVDS register address
  28  * @grf: GRF register
  29  * @panel: Panel device that is used in driver
  30  *
  31  * @output: Output mode, decided single or double channel,
  32  *              LVDS or LVTLL
  33  * @format: Data format that RGB data will packing as
  34  */
  35 struct rk_lvds_priv {
  36         void __iomem *regs;
  37         struct rk3288_grf *grf;
  38         struct udevice *panel;
  39
  40         int output;
  41         int format;
  42 };
  43
  44 static inline void lvds_writel(struct rk_lvds_priv *lvds, u32 offset, u32 val)
  45 {
  46         writel(val, lvds->regs + offset);
  47
  48         writel(val, lvds->regs + offset + 0x100);
  49 }
  50
  51 int rk_lvds_enable(struct udevice *dev, int panel_bpp,
  52                    const struct display_timing *edid)
  53 {
  54         struct rk_lvds_priv *priv = dev_get_priv(dev);
  55         struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
  56         int ret = 0;
  57         unsigned int val = 0;
  58
  59         ret = panel_enable_backlight(priv->panel);
  60         if (ret) {
  61                 debug("%s: backlight error: %d\n", __func__, ret);
  62                 return ret;
  63         }
  64
  65         /* Select the video source */
  66         if (uc_plat->source_id)
  67                 val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT |
  68                     (RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16);
  69         else
  70                 val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
  71         rk_setreg(&priv->grf->soc_con6, val);
  72
  73         /* Select data transfer format */
  74         val = priv->format;
  75         if (priv->output == LVDS_OUTPUT_DUAL)
  76                 val |= LVDS_DUAL | LVDS_CH0_EN | LVDS_CH1_EN;
  77         else if (priv->output == LVDS_OUTPUT_SINGLE)
  78                 val |= LVDS_CH0_EN;
  79         else if (priv->output == LVDS_OUTPUT_RGB)
  80                 val |= LVDS_TTL_EN | LVDS_CH0_EN | LVDS_CH1_EN;
  81         val |= (0xffff << 16);
  82         rk_setreg(&priv->grf->soc_con7, val);
  83
  84         /* Enable LVDS PHY */
  85         if (priv->output == LVDS_OUTPUT_RGB) {
  86                 lvds_writel(priv, RK3288_LVDS_CH0_REG0,
  87                             RK3288_LVDS_CH0_REG0_TTL_EN |
  88                             RK3288_LVDS_CH0_REG0_LANECK_EN |
  89                             RK3288_LVDS_CH0_REG0_LANE4_EN |
  90                             RK3288_LVDS_CH0_REG0_LANE3_EN |
  91                             RK3288_LVDS_CH0_REG0_LANE2_EN |
  92                             RK3288_LVDS_CH0_REG0_LANE1_EN |
  93                             RK3288_LVDS_CH0_REG0_LANE0_EN);
  94                 lvds_writel(priv, RK3288_LVDS_CH0_REG2,
  95                             RK3288_LVDS_PLL_FBDIV_REG2(0x46));
  96
  97                 lvds_writel(priv, RK3288_LVDS_CH0_REG3,
  98                             RK3288_LVDS_PLL_FBDIV_REG3(0x46));
  99                 lvds_writel(priv, RK3288_LVDS_CH0_REG4,
 100                             RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE |
 101                             RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE |
 102                             RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE |
 103                             RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE |
 104                             RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE |
 105                             RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE);
 106                 lvds_writel(priv, RK3288_LVDS_CH0_REG5,
 107                             RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA |
 108                             RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA |
 109                             RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA |
 110                             RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA |
 111                             RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA |
 112                             RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA);
 113                 lvds_writel(priv, RK3288_LVDS_CH0_REGD,
 114                             RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
 115                 lvds_writel(priv, RK3288_LVDS_CH0_REG20,
 116                             RK3288_LVDS_CH0_REG20_LSB);
 117         } else {
 118                 lvds_writel(priv, RK3288_LVDS_CH0_REG0,
 119                             RK3288_LVDS_CH0_REG0_LVDS_EN |
 120                             RK3288_LVDS_CH0_REG0_LANECK_EN |
 121                             RK3288_LVDS_CH0_REG0_LANE4_EN |
 122                             RK3288_LVDS_CH0_REG0_LANE3_EN |
 123                             RK3288_LVDS_CH0_REG0_LANE2_EN |
 124                             RK3288_LVDS_CH0_REG0_LANE1_EN |
 125                             RK3288_LVDS_CH0_REG0_LANE0_EN);
 126                 lvds_writel(priv, RK3288_LVDS_CH0_REG1,
 127                             RK3288_LVDS_CH0_REG1_LANECK_BIAS |
 128                             RK3288_LVDS_CH0_REG1_LANE4_BIAS |
 129                             RK3288_LVDS_CH0_REG1_LANE3_BIAS |
 130                             RK3288_LVDS_CH0_REG1_LANE2_BIAS |
 131                             RK3288_LVDS_CH0_REG1_LANE1_BIAS |
 132                             RK3288_LVDS_CH0_REG1_LANE0_BIAS);
 133                 lvds_writel(priv, RK3288_LVDS_CH0_REG2,
 134                             RK3288_LVDS_CH0_REG2_RESERVE_ON |
 135                             RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE |
 136                             RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE |
 137                             RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE |
 138                             RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE |
 139                             RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE |
 140                             RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE |
 141                             RK3288_LVDS_PLL_FBDIV_REG2(0x46));
 142                 lvds_writel(priv, RK3288_LVDS_CH0_REG3,
 143                             RK3288_LVDS_PLL_FBDIV_REG3(0x46));
 144                 lvds_writel(priv, RK3288_LVDS_CH0_REG4, 0x00);
 145                 lvds_writel(priv, RK3288_LVDS_CH0_REG5, 0x00);
 146                 lvds_writel(priv, RK3288_LVDS_CH0_REGD,
 147                             RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
 148                 lvds_writel(priv, RK3288_LVDS_CH0_REG20,
 149                             RK3288_LVDS_CH0_REG20_LSB);
 150         }
 151
 152         /* Power on */
 153         writel(RK3288_LVDS_CFG_REGC_PLL_ENABLE,
 154                priv->regs + RK3288_LVDS_CFG_REGC);
 155
 156         writel(RK3288_LVDS_CFG_REG21_TX_ENABLE,
 157                priv->regs + RK3288_LVDS_CFG_REG21);
 158
 159         return 0;
 160 }
 161
 162 int rk_lvds_read_timing(struct udevice *dev, struct display_timing *timing)
 163 {
 164         if (fdtdec_decode_display_timing
 165             (gd->fdt_blob, dev_of_offset(dev), 0, timing)) {
 166                 debug("%s: Failed to decode display timing\n", __func__);
 167                 return -EINVAL;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int rk_lvds_ofdata_to_platdata(struct udevice *dev)
 174 {
 175         struct rk_lvds_priv *priv = dev_get_priv(dev);
 176         const void *blob = gd->fdt_blob;
 177         int node = dev_of_offset(dev);
 178         int ret;
 179         priv->regs = (void *)dev_get_addr(dev);
 180         priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
 181
 182         ret = fdtdec_get_int(blob, node, "rockchip,output", -1);
 183         if (ret != -1) {
 184                 priv->output = ret;
 185                 debug("LVDS output : %d\n", ret);
 186         } else {
 187                 /* default set it as output rgb */
 188                 priv->output = LVDS_OUTPUT_RGB;
 189         }
 190
 191         ret = fdtdec_get_int(blob, node, "rockchip,data-mapping", -1);
 192         if (ret != -1) {
 193                 priv->format = ret;
 194                 debug("LVDS data-mapping : %d\n", ret);
 195         } else {
 196                 /* default set it as format jeida */
 197                 priv->format = LVDS_FORMAT_JEIDA;
 198         }
 199
 200         ret = fdtdec_get_int(blob, node, "rockchip,data-width", -1);
 201         if (ret != -1) {
 202                 debug("LVDS data-width : %d\n", ret);
 203                 if (ret == 24) {
 204                         priv->format |= LVDS_24BIT;
 205                 } else if (ret == 18) {
 206                         priv->format |= LVDS_18BIT;
 207                 } else {
 208                         debug("rockchip-lvds unsupport data-width[%d]\n", ret);
 209                         ret = -EINVAL;
 210                         return ret;
 211                 }
 212         } else {
 213                 priv->format |= LVDS_24BIT;
 214         }
 215
 216         return 0;
 217 }
 218
 219 int rk_lvds_probe(struct udevice *dev)
 220 {
 221         struct rk_lvds_priv *priv = dev_get_priv(dev);
 222         int ret;
 223
 224         ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
 225                                            &priv->panel);
 226         if (ret) {
 227                 debug("%s: Cannot find panel for '%s' (ret=%d)\n", __func__,
 228                       dev->name, ret);
 229                 return ret;
 230         }
 231
 232         return 0;
 233 }
 234
 235 static const struct dm_display_ops lvds_rockchip_ops = {
 236         .read_timing = rk_lvds_read_timing,
 237         .enable = rk_lvds_enable,
 238 };
 239
 240 static const struct udevice_id rockchip_lvds_ids[] = {
 241         {.compatible = "rockchip,rk3288-lvds"},
 242         {}
 243 };
 244
 245 U_BOOT_DRIVER(lvds_rockchip) = {
 246         .name   = "lvds_rockchip",
 247         .id     = UCLASS_DISPLAY,
 248         .of_match = rockchip_lvds_ids,
 249         .ops    = &lvds_rockchip_ops,
 250         .ofdata_to_platdata     = rk_lvds_ofdata_to_platdata,
 251         .probe  = rk_lvds_probe,
 252         .priv_auto_alloc_size   = sizeof(struct rk_lvds_priv),
 253 };