drivers/video/anx9804.c

   1 /*
   2  * (C) 2015 Hans de Goede <hdegoede@redhat.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 /*
   8  * Support for the ANX9804 bridge chip, which can take pixel data coming
   9  * from a parallel LCD interface and translate it on the flight into a DP
  10  * interface for driving eDP TFT displays.
  11  */
  12
  13 #include <common.h>
  14 #include <i2c.h>
  15 #include "anx9804.h"
  16
  17 /* Registers at i2c address 0x38 */
  18
  19 #define ANX9804_HDCP_CONTROL_0_REG                              0x01
  20
  21 #define ANX9804_SYS_CTRL2_REG                                   0x81
  22 #define ANX9804_SYS_CTRL2_CHA_STA                               0x04
  23
  24 #define ANX9804_SYS_CTRL3_REG                                   0x82
  25 #define ANX9804_SYS_CTRL3_VALID_CTRL                            BIT(0)
  26 #define ANX9804_SYS_CTRL3_F_VALID                               BIT(1)
  27 #define ANX9804_SYS_CTRL3_HPD_CTRL                              BIT(4)
  28 #define ANX9804_SYS_CTRL3_F_HPD                                 BIT(5)
  29
  30 #define ANX9804_LINK_BW_SET_REG                                 0xa0
  31 #define ANX9804_LANE_COUNT_SET_REG                              0xa1
  32 #define ANX9804_TRAINING_PTN_SET_REG                            0xa2
  33 #define ANX9804_TRAINING_LANE0_SET_REG                          0xa3
  34 #define ANX9804_TRAINING_LANE1_SET_REG                          0xa4
  35 #define ANX9804_TRAINING_LANE2_SET_REG                          0xa5
  36 #define ANX9804_TRAINING_LANE3_SET_REG                          0xa6
  37
  38 #define ANX9804_LINK_TRAINING_CTRL_REG                          0xa8
  39 #define ANX9804_LINK_TRAINING_CTRL_EN                           BIT(0)
  40
  41 #define ANX9804_LINK_DEBUG_REG                                  0xb8
  42 #define ANX9804_PLL_CTRL_REG                                    0xc7
  43 #define ANX9804_ANALOG_POWER_DOWN_REG                           0xc8
  44
  45 /* Registers at i2c address 0x39 */
  46
  47 #define ANX9804_DEV_IDH_REG                                     0x03
  48
  49 #define ANX9804_POWERD_CTRL_REG                                 0x05
  50 #define ANX9804_POWERD_AUDIO                                    BIT(4)
  51
  52 #define ANX9804_RST_CTRL_REG                                    0x06
  53
  54 #define ANX9804_RST_CTRL2_REG                                   0x07
  55 #define ANX9804_RST_CTRL2_AUX                                   BIT(2)
  56 #define ANX9804_RST_CTRL2_AC_MODE                               BIT(6)
  57
  58 #define ANX9804_VID_CTRL1_REG                                   0x08
  59 #define ANX9804_VID_CTRL1_VID_EN                                BIT(7)
  60 #define ANX9804_VID_CTRL1_EDGE                                  BIT(0)
  61
  62 #define ANX9804_VID_CTRL2_REG                                   0x09
  63 #define ANX9804_ANALOG_DEBUG_REG1                               0xdc
  64 #define ANX9804_ANALOG_DEBUG_REG3                               0xde
  65 #define ANX9804_PLL_FILTER_CTRL1                                0xdf
  66 #define ANX9804_PLL_FILTER_CTRL3                                0xe1
  67 #define ANX9804_PLL_FILTER_CTRL                                 0xe2
  68 #define ANX9804_PLL_CTRL3                                       0xe6
  69
  70 /**
  71  * anx9804_init() - Init anx9804 parallel lcd to edp bridge chip
  72  *
  73  * This function will init an anx9804 parallel lcd to dp bridge chip
  74  * using the passed in parameters.
  75  *
  76  * @i2c_bus:    Number of the i2c bus to which the anx9804 is connected.
  77  * @lanes:      Number of displayport lanes to use
  78  * @data_rate:  Register value for the bandwidth reg 0x06: 1.62G, 0x0a: 2.7G
  79  * @bpp:        Bits per pixel, must be 18 or 24
  80  */
  81 void anx9804_init(unsigned int i2c_bus, u8 lanes, u8 data_rate, int bpp)
  82 {
  83         unsigned int orig_i2c_bus = i2c_get_bus_num();
  84         u8 c, colordepth;
  85         int i;
  86
  87         i2c_set_bus_num(i2c_bus);
  88
  89         if (bpp == 18)
  90                 colordepth = 0x00; /* 6 bit */
  91         else
  92                 colordepth = 0x10; /* 8 bit */
  93
  94         /* Reset */
  95         i2c_reg_write(0x39, ANX9804_RST_CTRL_REG, 1);
  96         mdelay(100);
  97         i2c_reg_write(0x39, ANX9804_RST_CTRL_REG, 0);
  98
  99         /* Write 0 to the powerdown reg (powerup everything) */
 100         i2c_reg_write(0x39, ANX9804_POWERD_CTRL_REG, 0);
 101
 102         c = i2c_reg_read(0x39, ANX9804_DEV_IDH_REG);
 103         if (c != 0x98) {
 104                 printf("Error anx9804 chipid mismatch\n");
 105                 i2c_set_bus_num(orig_i2c_bus);
 106                 return;
 107         }
 108
 109         for (i = 0; i < 100; i++) {
 110                 c = i2c_reg_read(0x38, ANX9804_SYS_CTRL2_REG);
 111                 i2c_reg_write(0x38, ANX9804_SYS_CTRL2_REG, c);
 112                 c = i2c_reg_read(0x38, ANX9804_SYS_CTRL2_REG);
 113                 if ((c & ANX9804_SYS_CTRL2_CHA_STA) == 0)
 114                         break;
 115
 116                 mdelay(5);
 117         }
 118         if (i == 100)
 119                 printf("Error anx9804 clock is not stable\n");
 120
 121         i2c_reg_write(0x39, ANX9804_VID_CTRL2_REG, colordepth);
 122
 123         /* Set a bunch of analog related register values */
 124         i2c_reg_write(0x38, ANX9804_PLL_CTRL_REG, 0x07);
 125         i2c_reg_write(0x39, ANX9804_PLL_FILTER_CTRL3, 0x19);
 126         i2c_reg_write(0x39, ANX9804_PLL_CTRL3, 0xd9);
 127         i2c_reg_write(0x39, ANX9804_RST_CTRL2_REG, ANX9804_RST_CTRL2_AC_MODE);
 128         i2c_reg_write(0x39, ANX9804_ANALOG_DEBUG_REG1, 0xf0);
 129         i2c_reg_write(0x39, ANX9804_ANALOG_DEBUG_REG3, 0x99);
 130         i2c_reg_write(0x39, ANX9804_PLL_FILTER_CTRL1, 0x7b);
 131         i2c_reg_write(0x38, ANX9804_LINK_DEBUG_REG, 0x30);
 132         i2c_reg_write(0x39, ANX9804_PLL_FILTER_CTRL, 0x06);
 133
 134         /* Force HPD */
 135         i2c_reg_write(0x38, ANX9804_SYS_CTRL3_REG,
 136                       ANX9804_SYS_CTRL3_F_HPD | ANX9804_SYS_CTRL3_HPD_CTRL);
 137
 138         /* Power up and configure lanes */
 139         i2c_reg_write(0x38, ANX9804_ANALOG_POWER_DOWN_REG, 0x00);
 140         i2c_reg_write(0x38, ANX9804_TRAINING_LANE0_SET_REG, 0x00);
 141         i2c_reg_write(0x38, ANX9804_TRAINING_LANE1_SET_REG, 0x00);
 142         i2c_reg_write(0x38, ANX9804_TRAINING_LANE2_SET_REG, 0x00);
 143         i2c_reg_write(0x38, ANX9804_TRAINING_LANE3_SET_REG, 0x00);
 144
 145         /* Reset AUX CH */
 146         i2c_reg_write(0x39, ANX9804_RST_CTRL2_REG,
 147                       ANX9804_RST_CTRL2_AC_MODE | ANX9804_RST_CTRL2_AUX);
 148         i2c_reg_write(0x39, ANX9804_RST_CTRL2_REG,
 149                       ANX9804_RST_CTRL2_AC_MODE);
 150
 151         /* Powerdown audio and some other unused bits */
 152         i2c_reg_write(0x39, ANX9804_POWERD_CTRL_REG, ANX9804_POWERD_AUDIO);
 153         i2c_reg_write(0x38, ANX9804_HDCP_CONTROL_0_REG, 0x00);
 154         i2c_reg_write(0x38, 0xa7, 0x00);
 155
 156         /* Set data-rate / lanes */
 157         i2c_reg_write(0x38, ANX9804_LINK_BW_SET_REG, data_rate);
 158         i2c_reg_write(0x38, ANX9804_LANE_COUNT_SET_REG, lanes);
 159
 160         /* Link training */
 161         i2c_reg_write(0x38, ANX9804_LINK_TRAINING_CTRL_REG,
 162                       ANX9804_LINK_TRAINING_CTRL_EN);
 163         mdelay(5);
 164         for (i = 0; i < 100; i++) {
 165                 c = i2c_reg_read(0x38, ANX9804_LINK_TRAINING_CTRL_REG);
 166                 if ((c & 0x01) == 0)
 167                         break;
 168
 169                 mdelay(5);
 170         }
 171         if(i == 100) {
 172                 printf("Error anx9804 link training timeout\n");
 173                 i2c_set_bus_num(orig_i2c_bus);
 174                 return;
 175         }
 176
 177         /* Enable */
 178         i2c_reg_write(0x39, ANX9804_VID_CTRL1_REG,
 179                       ANX9804_VID_CTRL1_VID_EN | ANX9804_VID_CTRL1_EDGE);
 180         /* Force stream valid */
 181         i2c_reg_write(0x38, ANX9804_SYS_CTRL3_REG,
 182                       ANX9804_SYS_CTRL3_F_HPD | ANX9804_SYS_CTRL3_HPD_CTRL |
 183                       ANX9804_SYS_CTRL3_F_VALID | ANX9804_SYS_CTRL3_VALID_CTRL);
 184
 185         i2c_set_bus_num(orig_i2c_bus);
 186 }