drivers/video/rockchip/rk3288_mipi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
   4  * Author: Eric Gao <eric.gao@rock-chips.com>
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <display.h>
  10 #include <dm.h>
  11 #include <fdtdec.h>
  12 #include <panel.h>
  13 #include <regmap.h>
  14 #include "rk_mipi.h"
  15 #include <syscon.h>
  16 #include <asm/gpio.h>
  17 #include <asm/hardware.h>
  18 #include <asm/io.h>
  19 #include <dm/uclass-internal.h>
  20 #include <linux/kernel.h>
  21 #include <asm/arch/clock.h>
  22 #include <asm/arch/cru_rk3288.h>
  23 #include <asm/arch/grf_rk3288.h>
  24 #include <asm/arch/rockchip_mipi_dsi.h>
  25
  26 #define MHz 1000000
  27
  28 /* Select mipi dsi source, big or little vop */
  29 static int rk_mipi_dsi_source_select(struct udevice *dev)
  30 {
  31         struct rk_mipi_priv *priv = dev_get_priv(dev);
  32         struct rk3288_grf *grf = priv->grf;
  33         struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
  34
  35         /* Select the video source */
  36         switch (disp_uc_plat->source_id) {
  37         case VOP_B:
  38                 rk_clrsetreg(&grf->soc_con6, RK3288_DSI0_LCDC_SEL_MASK,
  39                              RK3288_DSI0_LCDC_SEL_BIG
  40                              << RK3288_DSI0_LCDC_SEL_SHIFT);
  41                 break;
  42         case VOP_L:
  43                 rk_clrsetreg(&grf->soc_con6, RK3288_DSI0_LCDC_SEL_MASK,
  44                              RK3288_DSI0_LCDC_SEL_LIT
  45                              << RK3288_DSI0_LCDC_SEL_SHIFT);
  46                 break;
  47         default:
  48                 debug("%s: Invalid VOP id\n", __func__);
  49                 return -EINVAL;
  50         }
  51
  52         return 0;
  53 }
  54
  55 /* Setup mipi dphy working mode */
  56 static void rk_mipi_dphy_mode_set(struct udevice *dev)
  57 {
  58         struct rk_mipi_priv *priv = dev_get_priv(dev);
  59         struct rk3288_grf *grf = priv->grf;
  60         int val;
  61
  62         /* Set Controller as TX mode */
  63         val = RK3288_DPHY_TX0_RXMODE_DIS << RK3288_DPHY_TX0_RXMODE_SHIFT;
  64         rk_clrsetreg(&grf->soc_con8, RK3288_DPHY_TX0_RXMODE_MASK, val);
  65
  66         /* Exit tx stop mode */
  67         val |= RK3288_DPHY_TX0_TXSTOPMODE_EN
  68                         << RK3288_DPHY_TX0_TXSTOPMODE_SHIFT;
  69         rk_clrsetreg(&grf->soc_con8,
  70                      RK3288_DPHY_TX0_TXSTOPMODE_MASK, val);
  71
  72         /* Disable turnequest */
  73         val |= RK3288_DPHY_TX0_TURNREQUEST_EN
  74                 << RK3288_DPHY_TX0_TURNREQUEST_SHIFT;
  75         rk_clrsetreg(&grf->soc_con8,
  76                      RK3288_DPHY_TX0_TURNREQUEST_MASK, val);
  77 }
  78
  79 /*
  80  * This function is called by rk_display_init() using rk_mipi_dsi_enable() and
  81  * rk_mipi_phy_enable() to initialize mipi controller and dphy. If success,
  82  * enable backlight.
  83  */
  84 static int rk_mipi_enable(struct udevice *dev, int panel_bpp,
  85                           const struct display_timing *timing)
  86 {
  87         int ret;
  88         struct rk_mipi_priv *priv = dev_get_priv(dev);
  89
  90         /* Fill the mipi controller parameter */
  91         priv->ref_clk = 24 * MHz;
  92         priv->sys_clk = priv->ref_clk;
  93         priv->pix_clk = timing->pixelclock.typ;
  94         priv->phy_clk = priv->pix_clk * 6;
  95         priv->txbyte_clk = priv->phy_clk / 8;
  96         priv->txesc_clk = 20 * MHz;
  97
  98         /* Select vop port, big or little */
  99         rk_mipi_dsi_source_select(dev);
 100
 101         /* Set mipi dphy work mode */
 102         rk_mipi_dphy_mode_set(dev);
 103
 104         /* Config  and enable mipi dsi according to timing */
 105         ret = rk_mipi_dsi_enable(dev, timing);
 106         if (ret) {
 107                 debug("%s: rk_mipi_dsi_enable() failed (err=%d)\n",
 108                       __func__, ret);
 109                 return ret;
 110         }
 111
 112         /* Config and enable mipi phy */
 113         ret = rk_mipi_phy_enable(dev);
 114         if (ret) {
 115                 debug("%s: rk_mipi_phy_enable() failed (err=%d)\n",
 116                       __func__, ret);
 117                 return ret;
 118         }
 119
 120         /* Enable backlight */
 121         ret = panel_enable_backlight(priv->panel);
 122         if (ret) {
 123                 debug("%s: panel_enable_backlight() failed (err=%d)\n",
 124                       __func__, ret);
 125                 return ret;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int rk_mipi_ofdata_to_platdata(struct udevice *dev)
 132 {
 133         struct rk_mipi_priv *priv = dev_get_priv(dev);
 134
 135         priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
 136         if (IS_ERR_OR_NULL(priv->grf)) {
 137                 debug("%s: Get syscon grf failed (ret=%p)\n",
 138                       __func__, priv->grf);
 139                 return  -ENXIO;
 140         }
 141         priv->regs = dev_read_addr(dev);
 142         if (priv->regs == FDT_ADDR_T_NONE) {
 143                 debug("%s: Get MIPI dsi address failed (ret=%lu)\n", __func__,
 144                       priv->regs);
 145                 return  -ENXIO;
 146         }
 147
 148         return 0;
 149 }
 150
 151 /*
 152  * Probe function: check panel existence and readingit's timing. Then config
 153  * mipi dsi controller and enable it according to the timing parameter.
 154  */
 155 static int rk_mipi_probe(struct udevice *dev)
 156 {
 157         int ret;
 158         struct rk_mipi_priv *priv = dev_get_priv(dev);
 159
 160         ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
 161                                            &priv->panel);
 162         if (ret) {
 163                 debug("%s: Can not find panel (err=%d)\n", __func__, ret);
 164                 return ret;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static const struct dm_display_ops rk_mipi_dsi_ops = {
 171         .read_timing = rk_mipi_read_timing,
 172         .enable = rk_mipi_enable,
 173 };
 174
 175 static const struct udevice_id rk_mipi_dsi_ids[] = {
 176         { .compatible = "rockchip,rk3288_mipi_dsi" },
 177         { }
 178 };
 179
 180 U_BOOT_DRIVER(rk_mipi_dsi) = {
 181         .name   = "rk_mipi_dsi",
 182         .id     = UCLASS_DISPLAY,
 183         .of_match = rk_mipi_dsi_ids,
 184         .ofdata_to_platdata = rk_mipi_ofdata_to_platdata,
 185         .probe  = rk_mipi_probe,
 186         .ops    = &rk_mipi_dsi_ops,
 187         .priv_auto_alloc_size   = sizeof(struct rk_mipi_priv),
 188 };