xref: /openbmc/linux/drivers/video/fbdev/via/vt1636.c (revision 58e16d792a6a8c6b750f637a4649967fcac853dc)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.

 */

#include <linux/via-core.h>
#include <linux/via_i2c.h>
#include "global.h"

static const struct IODATA common_init_data[] = {
/*  Index, Mask, Value */
	/* Set panel power sequence timing */
	{0x10, 0xC0, 0x00},
	/* T1: VDD on - Data on. Each increment is 1 ms. (50ms = 031h) */
	{0x0B, 0xFF, 0x40},
	/* T2: Data on - Backlight on. Each increment is 2 ms. (210ms = 068h) */
	{0x0C, 0xFF, 0x31},
	/* T3: Backlight off -Data off. Each increment is 2 ms. (210ms = 068h)*/
	{0x0D, 0xFF, 0x31},
	/* T4: Data off - VDD off. Each increment is 1 ms. (50ms = 031h) */
	{0x0E, 0xFF, 0x68},
	/* T5: VDD off - VDD on. Each increment is 100 ms. (500ms = 04h) */
	{0x0F, 0xFF, 0x68},
	/* LVDS output power up */
	{0x09, 0xA0, 0xA0},
	/* turn on back light */
	{0x10, 0x33, 0x13}
};

/* Index, Mask, Value */
static const struct IODATA dual_channel_enable_data = {0x08, 0xF0, 0xE0};
static const struct IODATA single_channel_enable_data = {0x08, 0xF0, 0x00};
static const struct IODATA dithering_enable_data = {0x0A, 0x70, 0x50};
static const struct IODATA dithering_disable_data = {0x0A, 0x70, 0x00};
static const struct IODATA vdd_on_data = {0x10, 0x20, 0x20};
static const struct IODATA vdd_off_data = {0x10, 0x20, 0x00};

u8 viafb_gpio_i2c_read_lvds(struct lvds_setting_information
	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
	u8 index)
{
	u8 data;

	viafb_i2c_readbyte(plvds_chip_info->i2c_port,
			   plvds_chip_info->lvds_chip_slave_addr, index, &data);
	return data;
}

void viafb_gpio_i2c_write_mask_lvds(struct lvds_setting_information
			      *plvds_setting_info, struct lvds_chip_information
			      *plvds_chip_info, struct IODATA io_data)
{
	int index, data;

	index = io_data.Index;
	data = viafb_gpio_i2c_read_lvds(plvds_setting_info, plvds_chip_info,
		index);
	data = (data & (~io_data.Mask)) | io_data.Data;

	viafb_i2c_writebyte(plvds_chip_info->i2c_port,
			    plvds_chip_info->lvds_chip_slave_addr, index, data);
}

void viafb_init_lvds_vt1636(struct lvds_setting_information
	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info)
{
	int reg_num, i;

	/* Common settings: */
	reg_num = ARRAY_SIZE(common_init_data);
	for (i = 0; i < reg_num; i++)
		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
			plvds_chip_info, common_init_data[i]);

	/* Input Data Mode Select */
	if (plvds_setting_info->device_lcd_dualedge)
		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
			plvds_chip_info, dual_channel_enable_data);
	else
		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
			plvds_chip_info, single_channel_enable_data);

	if (plvds_setting_info->LCDDithering)
		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
			plvds_chip_info, dithering_enable_data);
	else
		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
			plvds_chip_info, dithering_disable_data);
}

void viafb_enable_lvds_vt1636(struct lvds_setting_information
			*plvds_setting_info,
			struct lvds_chip_information *plvds_chip_info)
{
	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
		vdd_on_data);
}

void viafb_disable_lvds_vt1636(struct lvds_setting_information
			 *plvds_setting_info,
			 struct lvds_chip_information *plvds_chip_info)
{
	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
		vdd_off_data);
}

bool viafb_lvds_identify_vt1636(u8 i2c_adapter)
{
	u8 Buffer[2];

	DEBUG_MSG(KERN_INFO "viafb_lvds_identify_vt1636.\n");

	/* Sense VT1636 LVDS Transmiter */
	viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
		VT1636_LVDS_I2C_ADDR;

	/* Check vendor ID first: */
	if (viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR,
					0x00, &Buffer[0]))
		return false;
	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x01, &Buffer[1]);

	if (!((Buffer[0] == 0x06) && (Buffer[1] == 0x11)))
		return false;

	/* Check Chip ID: */
	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x02, &Buffer[0]);
	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x03, &Buffer[1]);
	if ((Buffer[0] == 0x45) && (Buffer[1] == 0x33)) {
		viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
			VT1636_LVDS;
		return true;
	}

	return false;
}

static int get_clk_range_index(u32 Clk)
{
	if (Clk < DPA_CLK_30M)
		return DPA_CLK_RANGE_30M;
	else if (Clk < DPA_CLK_50M)
		return DPA_CLK_RANGE_30_50M;
	else if (Clk < DPA_CLK_70M)
		return DPA_CLK_RANGE_50_70M;
	else if (Clk < DPA_CLK_100M)
		return DPA_CLK_RANGE_70_100M;
	else if (Clk < DPA_CLK_150M)
		return DPA_CLK_RANGE_100_150M;
	else
		return DPA_CLK_RANGE_150M;
}

static void set_dpa_vt1636(struct lvds_setting_information
	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
		    struct VT1636_DPA_SETTING *p_vt1636_dpa_setting)
{
	struct IODATA io_data;

	io_data.Index = 0x09;
	io_data.Mask = 0x1F;
	io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST1;
	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
		plvds_chip_info, io_data);

	io_data.Index = 0x08;
	io_data.Mask = 0x0F;
	io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST2;
	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
		io_data);
}

void viafb_vt1636_patch_skew_on_vt3324(
	struct lvds_setting_information *plvds_setting_info,
	struct lvds_chip_information *plvds_chip_info)
{
	struct VT1636_DPA_SETTING dpa = {0x00, 0x00}, dpa_16x12 = {0x0B, 0x03},
		*pdpa;
	int index;

	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3324.\n");

	/* Graphics DPA settings: */
	index = get_clk_range_index(plvds_setting_info->vclk);
	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
		    &GFX_DPA_SETTING_TBL_VT3324[index]);

	/* LVDS Transmitter DPA settings: */
	if (plvds_setting_info->lcd_panel_hres == 1600 &&
		plvds_setting_info->lcd_panel_vres == 1200)
		pdpa = &dpa_16x12;
	else
		pdpa = &dpa;

	set_dpa_vt1636(plvds_setting_info, plvds_chip_info, pdpa);
}

void viafb_vt1636_patch_skew_on_vt3327(
	struct lvds_setting_information *plvds_setting_info,
	struct lvds_chip_information *plvds_chip_info)
{
	struct VT1636_DPA_SETTING dpa = {0x00, 0x00};
	int index;

	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3327.\n");

	/* Graphics DPA settings: */
	index = get_clk_range_index(plvds_setting_info->vclk);
	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
		    &GFX_DPA_SETTING_TBL_VT3327[index]);

	/* LVDS Transmitter DPA settings: */
	set_dpa_vt1636(plvds_setting_info, plvds_chip_info, &dpa);
}

void viafb_vt1636_patch_skew_on_vt3364(
	struct lvds_setting_information *plvds_setting_info,
	struct lvds_chip_information *plvds_chip_info)
{
	int index;

	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3364.\n");

	/* Graphics DPA settings: */
	index = get_clk_range_index(plvds_setting_info->vclk);
	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
		    &GFX_DPA_SETTING_TBL_VT3364[index]);
}