drivers/video/ld9040.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * ld9040 AMOLED LCD panel driver.
   4  *
   5  * Copyright (C) 2012 Samsung Electronics
   6  * Donghwa Lee <dh09.lee@samsung.com>
   7  */
   8
   9 #include <common.h>
  10 #include <spi.h>
  11 #include <linux/delay.h>
  12
  13 static const unsigned char SEQ_USER_SETTING[] = {
  14         0xF0, 0x5A, 0x5A
  15 };
  16
  17 static const unsigned char SEQ_ELVSS_ON[] = {
  18         0xB1, 0x0D, 0x00, 0x16,
  19 };
  20
  21 static const unsigned char SEQ_GTCON[] = {
  22         0xF7, 0x09, 0x00, 0x00,
  23 };
  24
  25 static const unsigned char SEQ_PANEL_CONDITION[] = {
  26         0xF8, 0x05, 0x65, 0x96, 0x71, 0x7D, 0x19, 0x3B,
  27         0x0D, 0x19, 0x7E, 0x0D, 0xE2, 0x00, 0x00, 0x7E,
  28         0x7D, 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02,
  29 };
  30
  31 static const unsigned char SEQ_GAMMA_SET1[] = {
  32         0xF9, 0x00, 0xA7, 0xB4, 0xAE, 0xBF, 0x00, 0x91,
  33         0x00, 0xB2, 0xB4, 0xAA, 0xBB, 0x00, 0xAC, 0x00,
  34         0xB3, 0xB1, 0xAA, 0xBC, 0x00, 0xB3,
  35 };
  36
  37 static const unsigned char SEQ_GAMMA_CTRL[] = {
  38         0xFB, 0x02, 0x5A,
  39 };
  40
  41 static const unsigned char SEQ_DISPCTL[] = {
  42         0xF2, 0x02, 0x08, 0x08, 0x10, 0x10,
  43 };
  44
  45 static const unsigned char SEQ_MANPWR[] = {
  46         0xB0, 0x04,
  47 };
  48
  49 static const unsigned char SEQ_PWR_CTRL[] = {
  50         0xF4, 0x0A, 0x87, 0x25, 0x6A, 0x44, 0x02, 0x88,
  51 };
  52
  53 static const unsigned char SEQ_SLPOUT[] = {
  54         0x11,
  55 };
  56
  57 static const unsigned char SEQ_DISPON[] = {
  58         0x29,
  59 };
  60
  61 static const unsigned char SEQ_DISPOFF[] = {
  62         0x28,
  63 };
  64
  65 static void ld9040_spi_write(const unsigned char *wbuf, unsigned int size_cmd)
  66 {
  67         int i = 0;
  68
  69         /*
  70          * Data are transmitted in 9-bit words:
  71          * the first bit is command/parameter, the other are the value.
  72          * The value's LSB is shifted to MSB position, to be sent as 9th bit
  73          */
  74
  75         unsigned int data_out = 0, data_in = 0;
  76         for (i = 0; i < size_cmd; i++) {
  77                 data_out = wbuf[i] >> 1;
  78                 if (i != 0)
  79                         data_out += 0x0080;
  80                 if (wbuf[i] & 0x01)
  81                         data_out += 0x8000;
  82                 spi_xfer(NULL, 9, &data_out, &data_in, SPI_XFER_BEGIN);
  83         }
  84 }
  85
  86 void ld9040_cfg_ldo(void)
  87 {
  88         udelay(10);
  89
  90         ld9040_spi_write(SEQ_USER_SETTING,
  91                                         ARRAY_SIZE(SEQ_USER_SETTING));
  92         ld9040_spi_write(SEQ_PANEL_CONDITION,
  93                                         ARRAY_SIZE(SEQ_PANEL_CONDITION));
  94         ld9040_spi_write(SEQ_DISPCTL, ARRAY_SIZE(SEQ_DISPCTL));
  95         ld9040_spi_write(SEQ_MANPWR, ARRAY_SIZE(SEQ_MANPWR));
  96         ld9040_spi_write(SEQ_PWR_CTRL, ARRAY_SIZE(SEQ_PWR_CTRL));
  97         ld9040_spi_write(SEQ_ELVSS_ON, ARRAY_SIZE(SEQ_ELVSS_ON));
  98         ld9040_spi_write(SEQ_GTCON, ARRAY_SIZE(SEQ_GTCON));
  99         ld9040_spi_write(SEQ_GAMMA_SET1, ARRAY_SIZE(SEQ_GAMMA_SET1));
 100         ld9040_spi_write(SEQ_GAMMA_CTRL, ARRAY_SIZE(SEQ_GAMMA_CTRL));
 101         ld9040_spi_write(SEQ_SLPOUT, ARRAY_SIZE(SEQ_SLPOUT));
 102
 103         udelay(120);
 104 }
 105
 106 void ld9040_enable_ldo(unsigned int onoff)
 107 {
 108         if (onoff)
 109                 ld9040_spi_write(SEQ_DISPON, ARRAY_SIZE(SEQ_DISPON));
 110         else
 111                 ld9040_spi_write(SEQ_DISPOFF, ARRAY_SIZE(SEQ_DISPOFF));
 112 }