drivers/video/rockchip/rk3399_mipi.c

   1 /*
   2  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
   3  * Author: Eric Gao <eric.gao@rock-chips.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <clk.h>
  10 #include <display.h>
  11 #include <dm.h>
  12 #include <fdtdec.h>
  13 #include <panel.h>
  14 #include <regmap.h>
  15 #include "rk_mipi.h"
  16 #include <syscon.h>
  17 #include <asm/gpio.h>
  18 #include <asm/hardware.h>
  19 #include <asm/io.h>
  20 #include <dm/uclass-internal.h>
  21 #include <linux/kernel.h>
  22 #include <asm/arch/clock.h>
  23 #include <asm/arch/cru_rk3399.h>
  24 #include <asm/arch/grf_rk3399.h>
  25 #include <asm/arch/rockchip_mipi_dsi.h>
  26
  27 DECLARE_GLOBAL_DATA_PTR;
  28
  29 /* Select mipi dsi source, big or little vop */
  30 static int rk_mipi_dsi_source_select(struct udevice *dev)
  31 {
  32         struct rk_mipi_priv *priv = dev_get_priv(dev);
  33         struct rk3399_grf_regs *grf = priv->grf;
  34         struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
  35
  36         /* Select the video source */
  37         switch (disp_uc_plat->source_id) {
  38         case VOP_B:
  39                 rk_clrsetreg(&grf->soc_con20, GRF_DSI0_VOP_SEL_MASK,
  40                              GRF_DSI0_VOP_SEL_B << GRF_DSI0_VOP_SEL_SHIFT);
  41                 break;
  42         case VOP_L:
  43                 rk_clrsetreg(&grf->soc_con20, GRF_DSI0_VOP_SEL_MASK,
  44                              GRF_DSI0_VOP_SEL_L << GRF_DSI0_VOP_SEL_SHIFT);
  45                 break;
  46         default:
  47                 debug("%s: Invalid VOP id\n", __func__);
  48                 return -EINVAL;
  49         }
  50
  51         return 0;
  52 }
  53
  54 /* Setup mipi dphy working mode */
  55 static void rk_mipi_dphy_mode_set(struct udevice *dev)
  56 {
  57         struct rk_mipi_priv *priv = dev_get_priv(dev);
  58         struct rk3399_grf_regs *grf = priv->grf;
  59         int val;
  60
  61         /* Set Controller as TX mode */
  62         val = GRF_DPHY_TX0_RXMODE_DIS << GRF_DPHY_TX0_RXMODE_SHIFT;
  63         rk_clrsetreg(&grf->soc_con22, GRF_DPHY_TX0_RXMODE_MASK, val);
  64
  65         /* Exit tx stop mode */
  66         val |= GRF_DPHY_TX0_TXSTOPMODE_DIS << GRF_DPHY_TX0_TXSTOPMODE_SHIFT;
  67         rk_clrsetreg(&grf->soc_con22, GRF_DPHY_TX0_TXSTOPMODE_MASK, val);
  68
  69         /* Disable turnequest */
  70         val |= GRF_DPHY_TX0_TURNREQUEST_DIS << GRF_DPHY_TX0_TURNREQUEST_SHIFT;
  71         rk_clrsetreg(&grf->soc_con22, GRF_DPHY_TX0_TURNREQUEST_MASK, val);
  72 }
  73
  74 /*
  75  * This function is called by rk_display_init() using rk_mipi_dsi_enable() and
  76  * rk_mipi_phy_enable() to initialize mipi controller and dphy. If success,
  77  * enable backlight.
  78  */
  79 static int rk_display_enable(struct udevice *dev, int panel_bpp,
  80                           const struct display_timing *timing)
  81 {
  82         int ret;
  83         struct rk_mipi_priv *priv = dev_get_priv(dev);
  84
  85         /* Fill the mipi controller parameter */
  86         priv->ref_clk = 24 * MHz;
  87         priv->sys_clk = priv->ref_clk;
  88         priv->pix_clk = timing->pixelclock.typ;
  89         priv->phy_clk = priv->pix_clk * 6;
  90         priv->txbyte_clk = priv->phy_clk / 8;
  91         priv->txesc_clk = 20 * MHz;
  92
  93         /* Select vop port, big or little */
  94         rk_mipi_dsi_source_select(dev);
  95
  96         /* Set mipi dphy work mode */
  97         rk_mipi_dphy_mode_set(dev);
  98
  99         /* Config  and enable mipi dsi according to timing */
 100         ret = rk_mipi_dsi_enable(dev, timing);
 101         if (ret) {
 102                 debug("%s: rk_mipi_dsi_enable() failed (err=%d)\n",
 103                       __func__, ret);
 104                 return ret;
 105         }
 106
 107         /* Config and enable mipi phy */
 108         ret = rk_mipi_phy_enable(dev);
 109         if (ret) {
 110                 debug("%s: rk_mipi_phy_enable() failed (err=%d)\n",
 111                       __func__, ret);
 112                 return ret;
 113         }
 114
 115         /* Enable backlight */
 116         ret = panel_enable_backlight(priv->panel);
 117         if (ret) {
 118                 debug("%s: panel_enable_backlight() failed (err=%d)\n",
 119                       __func__, ret);
 120                 return ret;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static int rk_mipi_ofdata_to_platdata(struct udevice *dev)
 127 {
 128         struct rk_mipi_priv *priv = dev_get_priv(dev);
 129
 130         priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
 131         if (priv->grf <= 0) {
 132                 debug("%s: Get syscon grf failed (ret=%p)\n",
 133                       __func__, priv->grf);
 134                 return  -ENXIO;
 135         }
 136         priv->regs = dev_read_addr(dev);
 137         if (priv->regs == FDT_ADDR_T_NONE) {
 138                 debug("%s: Get MIPI dsi address failed\n", __func__);
 139                 return  -ENXIO;
 140         }
 141
 142         return 0;
 143 }
 144
 145 /*
 146  * Probe function: check panel existence and readingit's timing. Then config
 147  * mipi dsi controller and enable it according to the timing parameter.
 148  */
 149 static int rk_mipi_probe(struct udevice *dev)
 150 {
 151         int ret;
 152         struct rk_mipi_priv *priv = dev_get_priv(dev);
 153
 154         ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
 155                                            &priv->panel);
 156         if (ret) {
 157                 debug("%s: Can not find panel (err=%d)\n", __func__, ret);
 158                 return ret;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static const struct dm_display_ops rk_mipi_dsi_ops = {
 165         .read_timing = rk_mipi_read_timing,
 166         .enable = rk_display_enable,
 167 };
 168
 169 static const struct udevice_id rk_mipi_dsi_ids[] = {
 170         { .compatible = "rockchip,rk3399_mipi_dsi" },
 171         { }
 172 };
 173
 174 U_BOOT_DRIVER(rk_mipi_dsi) = {
 175         .name   = "rk_mipi_dsi",
 176         .id     = UCLASS_DISPLAY,
 177         .of_match = rk_mipi_dsi_ids,
 178         .ofdata_to_platdata = rk_mipi_ofdata_to_platdata,
 179         .probe  = rk_mipi_probe,
 180         .ops    = &rk_mipi_dsi_ops,
 181         .priv_auto_alloc_size   = sizeof(struct rk_mipi_priv),
 182 };