board/gdsys/common/dp501.c

   1 /*
   2  * (C) Copyright 2012
   3  * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /* Parade Technologies Inc. DP501 DisplayPort DVI/HDMI Transmitter */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12 #include <errno.h>
  13 #include <i2c.h>
  14
  15 static void dp501_setbits(u8 addr, u8 reg, u8 mask)
  16 {
  17         u8 val;
  18
  19         val = i2c_reg_read(addr, reg);
  20         setbits_8(&val, mask);
  21         i2c_reg_write(addr, reg, val);
  22 }
  23
  24 static void dp501_clrbits(u8 addr, u8 reg, u8 mask)
  25 {
  26         u8 val;
  27
  28         val = i2c_reg_read(addr, reg);
  29         clrbits_8(&val, mask);
  30         i2c_reg_write(addr, reg, val);
  31 }
  32
  33 static int dp501_detect_cable_adapter(u8 addr)
  34 {
  35         u8 val = i2c_reg_read(addr, 0x00);
  36
  37         return !(val & 0x04);
  38 }
  39
  40 static void dp501_link_training(u8 addr)
  41 {
  42         u8 val;
  43
  44         val = i2c_reg_read(addr, 0x51);
  45         i2c_reg_write(addr, 0x5d, val); /* set link_bw */
  46         val = i2c_reg_read(addr, 0x52);
  47         i2c_reg_write(addr, 0x5e, val); /* set lane_cnt */
  48         val = i2c_reg_read(addr, 0x53);
  49         i2c_reg_write(addr, 0x5c, val); /* set downspread_ctl */
  50
  51         i2c_reg_write(addr, 0x5f, 0x0d); /* start training */
  52 }
  53
  54 void dp501_powerup(u8 addr)
  55 {
  56         dp501_clrbits(addr, 0x0a, 0x30); /* power on encoder */
  57         i2c_reg_write(addr, 0x27, 0x30); /* Hardware auto detect DVO timing */
  58         dp501_setbits(addr, 0x72, 0x80); /* DPCD read enable */
  59         dp501_setbits(addr, 0x30, 0x20); /* RS polynomial select */
  60         i2c_reg_write(addr, 0x71, 0x20); /* Enable Aux burst write */
  61         dp501_setbits(addr, 0x78, 0x30); /* Disable HPD2 IRQ */
  62         dp501_clrbits(addr, 0x2f, 0x40); /* Link FIFO reset selection */
  63
  64 #ifdef CONFIG_SYS_DP501_VCAPCTRL0
  65         i2c_reg_write(addr, 0x24, CONFIG_SYS_DP501_VCAPCTRL0);
  66 #else
  67         i2c_reg_write(addr, 0x24, 0xc0); /* SDR mode 0, ext. H/VSYNC */
  68 #endif
  69
  70 #ifdef CONFIG_SYS_DP501_DIFFERENTIAL
  71         i2c_reg_write(addr + 2, 0x24, 0x10); /* clock input differential */
  72         i2c_reg_write(addr + 2, 0x25, 0x04);
  73         i2c_reg_write(addr + 2, 0x26, 0x10);
  74 #else
  75         i2c_reg_write(addr + 2, 0x24, 0x02); /* clock input single ended */
  76 #endif
  77
  78         i2c_reg_write(addr + 2, 0x00, 0x18); /* driving strength */
  79         i2c_reg_write(addr + 2, 0x03, 0x06); /* driving strength */
  80         i2c_reg_write(addr, 0x2c, 0x00); /* configure N value */
  81         i2c_reg_write(addr, 0x2d, 0x00); /* configure N value */
  82         i2c_reg_write(addr, 0x2e, 0x0c); /* configure N value */
  83         i2c_reg_write(addr, 0x76, 0xff); /* clear all interrupt */
  84         dp501_setbits(addr, 0x78, 0x03); /* clear all interrupt */
  85         i2c_reg_write(addr, 0x75, 0xf8); /* aux channel reset */
  86         i2c_reg_write(addr, 0x75, 0x00); /* clear aux channel reset */
  87         i2c_reg_write(addr, 0x87, 0x70); /* set retry counter as 7 */
  88
  89         if (dp501_detect_cable_adapter(addr)) {
  90                 printf("DVI/HDMI cable adapter detected\n");
  91                 i2c_reg_write(addr, 0x5e, 0x04); /* enable 4 channel */
  92                 dp501_clrbits(addr, 0x00, 0x08); /* DVI/HDMI HDCP operation */
  93         } else {
  94                 printf("no DVI/HDMI cable adapter detected\n");
  95                 dp501_setbits(addr, 0x00, 0x08); /* for DP HDCP operation */
  96
  97                 dp501_link_training(addr);
  98         }
  99 }
 100
 101 void dp501_powerdown(u8 addr)
 102 {
 103         dp501_setbits(addr, 0x0a, 0x30); /* power down encoder, standby mode */
 104 }