mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) 2015 Hans de Goede <hdegoede@redhat.com>
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*/
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/*
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* Support for the ANX9804 bridge chip, which can take pixel data coming
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* from a parallel LCD interface and translate it on the flight into a DP
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* interface for driving eDP TFT displays.
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*/
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#include <common.h>
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#include <i2c.h>
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#include "anx98xx-edp.h"
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#include "anx9804.h"
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/**
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* anx9804_init() - Init anx9804 parallel lcd to edp bridge chip
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*
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* This function will init an anx9804 parallel lcd to dp bridge chip
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* using the passed in parameters.
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*
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* @i2c_bus: Number of the i2c bus to which the anx9804 is connected.
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* @lanes: Number of displayport lanes to use
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* @data_rate: Register value for the bandwidth reg 0x06: 1.62G, 0x0a: 2.7G
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* @bpp: Bits per pixel, must be 18 or 24
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*/
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void anx9804_init(unsigned int i2c_bus, u8 lanes, u8 data_rate, int bpp)
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{
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unsigned int orig_i2c_bus = i2c_get_bus_num();
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u8 c, colordepth;
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int i;
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i2c_set_bus_num(i2c_bus);
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if (bpp == 18)
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colordepth = 0x00; /* 6 bit */
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else
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colordepth = 0x10; /* 8 bit */
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/* Reset */
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i2c_reg_write(0x39, ANX9804_RST_CTRL_REG, 1);
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mdelay(100);
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i2c_reg_write(0x39, ANX9804_RST_CTRL_REG, 0);
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/* Write 0 to the powerdown reg (powerup everything) */
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i2c_reg_write(0x39, ANX9804_POWERD_CTRL_REG, 0);
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c = i2c_reg_read(0x39, ANX9804_DEV_IDH_REG);
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if (c != 0x98) {
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printf("Error anx9804 chipid mismatch\n");
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i2c_set_bus_num(orig_i2c_bus);
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return;
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}
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for (i = 0; i < 100; i++) {
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c = i2c_reg_read(0x38, ANX9804_SYS_CTRL2_REG);
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i2c_reg_write(0x38, ANX9804_SYS_CTRL2_REG, c);
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c = i2c_reg_read(0x38, ANX9804_SYS_CTRL2_REG);
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if ((c & ANX9804_SYS_CTRL2_CHA_STA) == 0)
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break;
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mdelay(5);
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}
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if (i == 100)
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printf("Error anx9804 clock is not stable\n");
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i2c_reg_write(0x39, ANX9804_VID_CTRL2_REG, colordepth);
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/* Set a bunch of analog related register values */
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i2c_reg_write(0x38, ANX9804_PLL_CTRL_REG, 0x07);
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i2c_reg_write(0x39, ANX9804_PLL_FILTER_CTRL3, 0x19);
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i2c_reg_write(0x39, ANX9804_PLL_CTRL3, 0xd9);
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i2c_reg_write(0x39, ANX9804_RST_CTRL2_REG, ANX9804_RST_CTRL2_AC_MODE);
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i2c_reg_write(0x39, ANX9804_ANALOG_DEBUG_REG1, 0xf0);
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i2c_reg_write(0x39, ANX9804_ANALOG_DEBUG_REG3, 0x99);
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i2c_reg_write(0x39, ANX9804_PLL_FILTER_CTRL1, 0x7b);
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i2c_reg_write(0x38, ANX9804_LINK_DEBUG_REG, 0x30);
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i2c_reg_write(0x39, ANX9804_PLL_FILTER_CTRL, 0x06);
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/* Force HPD */
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i2c_reg_write(0x38, ANX9804_SYS_CTRL3_REG,
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ANX9804_SYS_CTRL3_F_HPD | ANX9804_SYS_CTRL3_HPD_CTRL);
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/* Power up and configure lanes */
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i2c_reg_write(0x38, ANX9804_ANALOG_POWER_DOWN_REG, 0x00);
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i2c_reg_write(0x38, ANX9804_TRAINING_LANE0_SET_REG, 0x00);
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i2c_reg_write(0x38, ANX9804_TRAINING_LANE1_SET_REG, 0x00);
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i2c_reg_write(0x38, ANX9804_TRAINING_LANE2_SET_REG, 0x00);
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i2c_reg_write(0x38, ANX9804_TRAINING_LANE3_SET_REG, 0x00);
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/* Reset AUX CH */
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i2c_reg_write(0x39, ANX9804_RST_CTRL2_REG,
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ANX9804_RST_CTRL2_AC_MODE | ANX9804_RST_CTRL2_AUX);
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i2c_reg_write(0x39, ANX9804_RST_CTRL2_REG,
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ANX9804_RST_CTRL2_AC_MODE);
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/* Powerdown audio and some other unused bits */
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i2c_reg_write(0x39, ANX9804_POWERD_CTRL_REG, ANX9804_POWERD_AUDIO);
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i2c_reg_write(0x38, ANX9804_HDCP_CONTROL_0_REG, 0x00);
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i2c_reg_write(0x38, 0xa7, 0x00);
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/* Set data-rate / lanes */
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i2c_reg_write(0x38, ANX9804_LINK_BW_SET_REG, data_rate);
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i2c_reg_write(0x38, ANX9804_LANE_COUNT_SET_REG, lanes);
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/* Link training */
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i2c_reg_write(0x38, ANX9804_LINK_TRAINING_CTRL_REG,
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ANX9804_LINK_TRAINING_CTRL_EN);
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mdelay(5);
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for (i = 0; i < 100; i++) {
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c = i2c_reg_read(0x38, ANX9804_LINK_TRAINING_CTRL_REG);
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if ((c & 0x01) == 0)
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break;
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mdelay(5);
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}
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if(i == 100) {
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printf("Error anx9804 link training timeout\n");
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i2c_set_bus_num(orig_i2c_bus);
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return;
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}
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/* Enable */
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i2c_reg_write(0x39, ANX9804_VID_CTRL1_REG,
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ANX9804_VID_CTRL1_VID_EN | ANX9804_VID_CTRL1_EDGE);
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/* Force stream valid */
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i2c_reg_write(0x38, ANX9804_SYS_CTRL3_REG,
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ANX9804_SYS_CTRL3_F_HPD | ANX9804_SYS_CTRL3_HPD_CTRL |
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ANX9804_SYS_CTRL3_F_VALID | ANX9804_SYS_CTRL3_VALID_CTRL);
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i2c_set_bus_num(orig_i2c_bus);
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}
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