root/drivers/video/fbdev/via/vt1636.c

DEFINITIONS

1. viafb_gpio_i2c_read_lvds
2. viafb_gpio_i2c_write_mask_lvds
3. viafb_init_lvds_vt1636
4. viafb_enable_lvds_vt1636
5. viafb_disable_lvds_vt1636
6. viafb_lvds_identify_vt1636
7. get_clk_range_index
8. set_dpa_vt1636
9. viafb_vt1636_patch_skew_on_vt3324
10. viafb_vt1636_patch_skew_on_vt3327
11. viafb_vt1636_patch_skew_on_vt3364

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
   4  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
   5 
   6  */
   7 
   8 #include <linux/via-core.h>
   9 #include <linux/via_i2c.h>
  10 #include "global.h"
  11 
  12 static const struct IODATA common_init_data[] = {
  13 /*  Index, Mask, Value */
  14         /* Set panel power sequence timing */
  15         {0x10, 0xC0, 0x00},
  16         /* T1: VDD on - Data on. Each increment is 1 ms. (50ms = 031h) */
  17         {0x0B, 0xFF, 0x40},
  18         /* T2: Data on - Backlight on. Each increment is 2 ms. (210ms = 068h) */
  19         {0x0C, 0xFF, 0x31},
  20         /* T3: Backlight off -Data off. Each increment is 2 ms. (210ms = 068h)*/
  21         {0x0D, 0xFF, 0x31},
  22         /* T4: Data off - VDD off. Each increment is 1 ms. (50ms = 031h) */
  23         {0x0E, 0xFF, 0x68},
  24         /* T5: VDD off - VDD on. Each increment is 100 ms. (500ms = 04h) */
  25         {0x0F, 0xFF, 0x68},
  26         /* LVDS output power up */
  27         {0x09, 0xA0, 0xA0},
  28         /* turn on back light */
  29         {0x10, 0x33, 0x13}
  30 };
  31 
  32 /* Index, Mask, Value */
  33 static const struct IODATA dual_channel_enable_data = {0x08, 0xF0, 0xE0};
  34 static const struct IODATA single_channel_enable_data = {0x08, 0xF0, 0x00};
  35 static const struct IODATA dithering_enable_data = {0x0A, 0x70, 0x50};
  36 static const struct IODATA dithering_disable_data = {0x0A, 0x70, 0x00};
  37 static const struct IODATA vdd_on_data = {0x10, 0x20, 0x20};
  38 static const struct IODATA vdd_off_data = {0x10, 0x20, 0x00};
  39 
  40 u8 viafb_gpio_i2c_read_lvds(struct lvds_setting_information
  41         *plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
  42         u8 index)
  43 {
  44         u8 data;
  45 
  46         viafb_i2c_readbyte(plvds_chip_info->i2c_port,
  47                            plvds_chip_info->lvds_chip_slave_addr, index, &data);
  48         return data;
  49 }
  50 
  51 void viafb_gpio_i2c_write_mask_lvds(struct lvds_setting_information
  52                               *plvds_setting_info, struct lvds_chip_information
  53                               *plvds_chip_info, struct IODATA io_data)
  54 {
  55         int index, data;
  56 
  57         index = io_data.Index;
  58         data = viafb_gpio_i2c_read_lvds(plvds_setting_info, plvds_chip_info,
  59                 index);
  60         data = (data & (~io_data.Mask)) | io_data.Data;
  61 
  62         viafb_i2c_writebyte(plvds_chip_info->i2c_port,
  63                             plvds_chip_info->lvds_chip_slave_addr, index, data);
  64 }
  65 
  66 void viafb_init_lvds_vt1636(struct lvds_setting_information
  67         *plvds_setting_info, struct lvds_chip_information *plvds_chip_info)
  68 {
  69         int reg_num, i;
  70 
  71         /* Common settings: */
  72         reg_num = ARRAY_SIZE(common_init_data);
  73         for (i = 0; i < reg_num; i++)
  74                 viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  75                         plvds_chip_info, common_init_data[i]);
  76 
  77         /* Input Data Mode Select */
  78         if (plvds_setting_info->device_lcd_dualedge)
  79                 viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  80                         plvds_chip_info, dual_channel_enable_data);
  81         else
  82                 viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  83                         plvds_chip_info, single_channel_enable_data);
  84 
  85         if (plvds_setting_info->LCDDithering)
  86                 viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  87                         plvds_chip_info, dithering_enable_data);
  88         else
  89                 viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
  90                         plvds_chip_info, dithering_disable_data);
  91 }
  92 
  93 void viafb_enable_lvds_vt1636(struct lvds_setting_information
  94                         *plvds_setting_info,
  95                         struct lvds_chip_information *plvds_chip_info)
  96 {
  97         viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
  98                 vdd_on_data);
  99 }
 100 
 101 void viafb_disable_lvds_vt1636(struct lvds_setting_information
 102                          *plvds_setting_info,
 103                          struct lvds_chip_information *plvds_chip_info)
 104 {
 105         viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
 106                 vdd_off_data);
 107 }
 108 
 109 bool viafb_lvds_identify_vt1636(u8 i2c_adapter)
 110 {
 111         u8 Buffer[2];
 112 
 113         DEBUG_MSG(KERN_INFO "viafb_lvds_identify_vt1636.\n");
 114 
 115         /* Sense VT1636 LVDS Transmiter */
 116         viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
 117                 VT1636_LVDS_I2C_ADDR;
 118 
 119         /* Check vendor ID first: */
 120         if (viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR,
 121                                         0x00, &Buffer[0]))
 122                 return false;
 123         viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x01, &Buffer[1]);
 124 
 125         if (!((Buffer[0] == 0x06) && (Buffer[1] == 0x11)))
 126                 return false;
 127 
 128         /* Check Chip ID: */
 129         viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x02, &Buffer[0]);
 130         viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x03, &Buffer[1]);
 131         if ((Buffer[0] == 0x45) && (Buffer[1] == 0x33)) {
 132                 viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
 133                         VT1636_LVDS;
 134                 return true;
 135         }
 136 
 137         return false;
 138 }
 139 
 140 static int get_clk_range_index(u32 Clk)
 141 {
 142         if (Clk < DPA_CLK_30M)
 143                 return DPA_CLK_RANGE_30M;
 144         else if (Clk < DPA_CLK_50M)
 145                 return DPA_CLK_RANGE_30_50M;
 146         else if (Clk < DPA_CLK_70M)
 147                 return DPA_CLK_RANGE_50_70M;
 148         else if (Clk < DPA_CLK_100M)
 149                 return DPA_CLK_RANGE_70_100M;
 150         else if (Clk < DPA_CLK_150M)
 151                 return DPA_CLK_RANGE_100_150M;
 152         else
 153                 return DPA_CLK_RANGE_150M;
 154 }
 155 
 156 static void set_dpa_vt1636(struct lvds_setting_information
 157         *plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
 158                     struct VT1636_DPA_SETTING *p_vt1636_dpa_setting)
 159 {
 160         struct IODATA io_data;
 161 
 162         io_data.Index = 0x09;
 163         io_data.Mask = 0x1F;
 164         io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST1;
 165         viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
 166                 plvds_chip_info, io_data);
 167 
 168         io_data.Index = 0x08;
 169         io_data.Mask = 0x0F;
 170         io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST2;
 171         viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
 172                 io_data);
 173 }
 174 
 175 void viafb_vt1636_patch_skew_on_vt3324(
 176         struct lvds_setting_information *plvds_setting_info,
 177         struct lvds_chip_information *plvds_chip_info)
 178 {
 179         struct VT1636_DPA_SETTING dpa = {0x00, 0x00}, dpa_16x12 = {0x0B, 0x03},
 180                 *pdpa;
 181         int index;
 182 
 183         DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3324.\n");
 184 
 185         /* Graphics DPA settings: */
 186         index = get_clk_range_index(plvds_setting_info->vclk);
 187         viafb_set_dpa_gfx(plvds_chip_info->output_interface,
 188                     &GFX_DPA_SETTING_TBL_VT3324[index]);
 189 
 190         /* LVDS Transmitter DPA settings: */
 191         if (plvds_setting_info->lcd_panel_hres == 1600 &&
 192                 plvds_setting_info->lcd_panel_vres == 1200)
 193                 pdpa = &dpa_16x12;
 194         else
 195                 pdpa = &dpa;
 196 
 197         set_dpa_vt1636(plvds_setting_info, plvds_chip_info, pdpa);
 198 }
 199 
 200 void viafb_vt1636_patch_skew_on_vt3327(
 201         struct lvds_setting_information *plvds_setting_info,
 202         struct lvds_chip_information *plvds_chip_info)
 203 {
 204         struct VT1636_DPA_SETTING dpa = {0x00, 0x00};
 205         int index;
 206 
 207         DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3327.\n");
 208 
 209         /* Graphics DPA settings: */
 210         index = get_clk_range_index(plvds_setting_info->vclk);
 211         viafb_set_dpa_gfx(plvds_chip_info->output_interface,
 212                     &GFX_DPA_SETTING_TBL_VT3327[index]);
 213 
 214         /* LVDS Transmitter DPA settings: */
 215         set_dpa_vt1636(plvds_setting_info, plvds_chip_info, &dpa);
 216 }
 217 
 218 void viafb_vt1636_patch_skew_on_vt3364(
 219         struct lvds_setting_information *plvds_setting_info,
 220         struct lvds_chip_information *plvds_chip_info)
 221 {
 222         int index;
 223 
 224         DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3364.\n");
 225 
 226         /* Graphics DPA settings: */
 227         index = get_clk_range_index(plvds_setting_info->vclk);
 228         viafb_set_dpa_gfx(plvds_chip_info->output_interface,
 229                     &GFX_DPA_SETTING_TBL_VT3364[index]);
 230 }