xref: /kernel/linux/linux-6.6/drivers/video/fbdev/via/lcd.c

// 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"

#define viafb_compact_res(x, y) (((x)<<16)|(y))

/* CLE266 Software Power Sequence */
/* {Mask}, {Data}, {Delay} */
static const int PowerSequenceOn[3][3] = {
	{0x10, 0x08, 0x06}, {0x10, 0x08, 0x06},	{0x19, 0x1FE, 0x01}
};
static const int PowerSequenceOff[3][3] = {
	{0x06, 0x08, 0x10}, {0x00, 0x00, 0x00},	{0xD2, 0x19, 0x01}
};

static struct _lcd_scaling_factor lcd_scaling_factor = {
	/* LCD Horizontal Scaling Factor Register */
	{LCD_HOR_SCALING_FACTOR_REG_NUM,
	 {{CR9F, 0, 1}, {CR77, 0, 7}, {CR79, 4, 5} } },
	/* LCD Vertical Scaling Factor Register */
	{LCD_VER_SCALING_FACTOR_REG_NUM,
	 {{CR79, 3, 3}, {CR78, 0, 7}, {CR79, 6, 7} } }
};
static struct _lcd_scaling_factor lcd_scaling_factor_CLE = {
	/* LCD Horizontal Scaling Factor Register */
	{LCD_HOR_SCALING_FACTOR_REG_NUM_CLE, {{CR77, 0, 7}, {CR79, 4, 5} } },
	/* LCD Vertical Scaling Factor Register */
	{LCD_VER_SCALING_FACTOR_REG_NUM_CLE, {{CR78, 0, 7}, {CR79, 6, 7} } }
};

static bool lvds_identify_integratedlvds(void);
static void fp_id_to_vindex(int panel_id);
static int lvds_register_read(int index);
static void load_lcd_scaling(int set_hres, int set_vres, int panel_hres,
		      int panel_vres);
static void lcd_patch_skew_dvp0(struct lvds_setting_information
			 *plvds_setting_info,
			 struct lvds_chip_information *plvds_chip_info);
static void lcd_patch_skew_dvp1(struct lvds_setting_information
			 *plvds_setting_info,
			 struct lvds_chip_information *plvds_chip_info);
static void lcd_patch_skew(struct lvds_setting_information
	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info);

static void integrated_lvds_disable(struct lvds_setting_information
			     *plvds_setting_info,
			     struct lvds_chip_information *plvds_chip_info);
static void integrated_lvds_enable(struct lvds_setting_information
			    *plvds_setting_info,
			    struct lvds_chip_information *plvds_chip_info);
static void lcd_powersequence_off(void);
static void lcd_powersequence_on(void);
static void fill_lcd_format(void);
static void check_diport_of_integrated_lvds(
	struct lvds_chip_information *plvds_chip_info,
				     struct lvds_setting_information
				     *plvds_setting_info);

static inline bool check_lvds_chip(int device_id_subaddr, int device_id)
{
	return lvds_register_read(device_id_subaddr) == device_id;
}

void viafb_init_lcd_size(void)
{
	DEBUG_MSG(KERN_INFO "viafb_init_lcd_size()\n");

	fp_id_to_vindex(viafb_lcd_panel_id);
	viaparinfo->lvds_setting_info2->lcd_panel_hres =
		viaparinfo->lvds_setting_info->lcd_panel_hres;
	viaparinfo->lvds_setting_info2->lcd_panel_vres =
		viaparinfo->lvds_setting_info->lcd_panel_vres;
	viaparinfo->lvds_setting_info2->device_lcd_dualedge =
	    viaparinfo->lvds_setting_info->device_lcd_dualedge;
	viaparinfo->lvds_setting_info2->LCDDithering =
		viaparinfo->lvds_setting_info->LCDDithering;
}

static bool lvds_identify_integratedlvds(void)
{
	if (viafb_display_hardware_layout == HW_LAYOUT_LCD_EXTERNAL_LCD2) {
		/* Two dual channel LCD (Internal LVDS + External LVDS): */
		/* If we have an external LVDS, such as VT1636, we should
		   have its chip ID already. */
		if (viaparinfo->chip_info->lvds_chip_info.lvds_chip_name) {
			viaparinfo->chip_info->lvds_chip_info2.lvds_chip_name =
			    INTEGRATED_LVDS;
			DEBUG_MSG(KERN_INFO "Support two dual channel LVDS! "
				  "(Internal LVDS + External LVDS)\n");
		} else {
			viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
			    INTEGRATED_LVDS;
			DEBUG_MSG(KERN_INFO "Not found external LVDS, "
				  "so can't support two dual channel LVDS!\n");
		}
	} else if (viafb_display_hardware_layout == HW_LAYOUT_LCD1_LCD2) {
		/* Two single channel LCD (Internal LVDS + Internal LVDS): */
		viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
		INTEGRATED_LVDS;
		viaparinfo->chip_info->lvds_chip_info2.lvds_chip_name =
			INTEGRATED_LVDS;
		DEBUG_MSG(KERN_INFO "Support two single channel LVDS! "
			  "(Internal LVDS + Internal LVDS)\n");
	} else if (viafb_display_hardware_layout != HW_LAYOUT_DVI_ONLY) {
		/* If we have found external LVDS, just use it,
		   otherwise, we will use internal LVDS as default. */
		if (!viaparinfo->chip_info->lvds_chip_info.lvds_chip_name) {
			viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
			    INTEGRATED_LVDS;
			DEBUG_MSG(KERN_INFO "Found Integrated LVDS!\n");
		}
	} else {
		viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
			NON_LVDS_TRANSMITTER;
		DEBUG_MSG(KERN_INFO "Do not support LVDS!\n");
		return false;
	}

	return true;
}

bool viafb_lvds_trasmitter_identify(void)
{
	if (viafb_lvds_identify_vt1636(VIA_PORT_31)) {
		viaparinfo->chip_info->lvds_chip_info.i2c_port = VIA_PORT_31;
		DEBUG_MSG(KERN_INFO
			  "Found VIA VT1636 LVDS on port i2c 0x31\n");
	} else {
		if (viafb_lvds_identify_vt1636(VIA_PORT_2C)) {
			viaparinfo->chip_info->lvds_chip_info.i2c_port =
				VIA_PORT_2C;
			DEBUG_MSG(KERN_INFO
				  "Found VIA VT1636 LVDS on port gpio 0x2c\n");
		}
	}

	if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700)
		lvds_identify_integratedlvds();

	if (viaparinfo->chip_info->lvds_chip_info.lvds_chip_name)
		return true;
	/* Check for VT1631: */
	viaparinfo->chip_info->lvds_chip_info.lvds_chip_name = VT1631_LVDS;
	viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
		VT1631_LVDS_I2C_ADDR;

	if (check_lvds_chip(VT1631_DEVICE_ID_REG, VT1631_DEVICE_ID)) {
		DEBUG_MSG(KERN_INFO "\n VT1631 LVDS ! \n");
		DEBUG_MSG(KERN_INFO "\n %2d",
			  viaparinfo->chip_info->lvds_chip_info.lvds_chip_name);
		DEBUG_MSG(KERN_INFO "\n %2d",
			  viaparinfo->chip_info->lvds_chip_info.lvds_chip_name);
		return true;
	}

	viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
		NON_LVDS_TRANSMITTER;
	viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
		VT1631_LVDS_I2C_ADDR;
	return false;
}

static void fp_id_to_vindex(int panel_id)
{
	DEBUG_MSG(KERN_INFO "fp_get_panel_id()\n");

	if (panel_id > LCD_PANEL_ID_MAXIMUM)
		viafb_lcd_panel_id = panel_id =
		viafb_read_reg(VIACR, CR3F) & 0x0F;

	switch (panel_id) {
	case 0x0:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 640;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 480;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x1:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 800;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 600;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x2:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1024;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x3:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x4:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 1024;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x5:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1400;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 1050;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x6:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1600;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 1200;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x8:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 800;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 480;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x9:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1024;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0xA:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1024;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0xB:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1024;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0xC:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0xD:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 1024;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0xE:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1400;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 1050;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0xF:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1600;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 1200;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0x10:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1366;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0x11:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1024;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 600;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x12:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x13:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 800;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x14:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1360;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0x15:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1280;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 768;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 1;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	case 0x16:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 480;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 640;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
		break;
	case 0x17:
		/* OLPC XO-1.5 panel */
		viaparinfo->lvds_setting_info->lcd_panel_hres = 1200;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 900;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 0;
		break;
	default:
		viaparinfo->lvds_setting_info->lcd_panel_hres = 800;
		viaparinfo->lvds_setting_info->lcd_panel_vres = 600;
		viaparinfo->lvds_setting_info->device_lcd_dualedge = 0;
		viaparinfo->lvds_setting_info->LCDDithering = 1;
	}
}

static int lvds_register_read(int index)
{
	u8 data;

	viafb_i2c_readbyte(VIA_PORT_2C,
			(u8) viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr,
			(u8) index, &data);
	return data;
}

static void load_lcd_scaling(int set_hres, int set_vres, int panel_hres,
		      int panel_vres)
{
	int reg_value = 0;
	int viafb_load_reg_num;
	struct io_register *reg = NULL;

	DEBUG_MSG(KERN_INFO "load_lcd_scaling()!!\n");

	/* LCD Scaling Enable */
	viafb_write_reg_mask(CR79, VIACR, 0x07, BIT0 + BIT1 + BIT2);

	/* Check if expansion for horizontal */
	if (set_hres < panel_hres) {
		/* Load Horizontal Scaling Factor */
		switch (viaparinfo->chip_info->gfx_chip_name) {
		case UNICHROME_CLE266:
		case UNICHROME_K400:
			reg_value =
			    CLE266_LCD_HOR_SCF_FORMULA(set_hres, panel_hres);
			viafb_load_reg_num =
			    lcd_scaling_factor_CLE.lcd_hor_scaling_factor.
			    reg_num;
			reg = lcd_scaling_factor_CLE.lcd_hor_scaling_factor.reg;
			viafb_load_reg(reg_value,
				viafb_load_reg_num, reg, VIACR);
			break;
		case UNICHROME_K800:
		case UNICHROME_PM800:
		case UNICHROME_CN700:
		case UNICHROME_CX700:
		case UNICHROME_K8M890:
		case UNICHROME_P4M890:
		case UNICHROME_P4M900:
		case UNICHROME_CN750:
		case UNICHROME_VX800:
		case UNICHROME_VX855:
		case UNICHROME_VX900:
			reg_value =
			    K800_LCD_HOR_SCF_FORMULA(set_hres, panel_hres);
			/* Horizontal scaling enabled */
			viafb_write_reg_mask(CRA2, VIACR, 0xC0, BIT7 + BIT6);
			viafb_load_reg_num =
			    lcd_scaling_factor.lcd_hor_scaling_factor.reg_num;
			reg = lcd_scaling_factor.lcd_hor_scaling_factor.reg;
			viafb_load_reg(reg_value,
				viafb_load_reg_num, reg, VIACR);
			break;
		}

		DEBUG_MSG(KERN_INFO "Horizontal Scaling value = %d", reg_value);
	} else {
		/* Horizontal scaling disabled */
		viafb_write_reg_mask(CRA2, VIACR, 0x00, BIT7);
	}

	/* Check if expansion for vertical */
	if (set_vres < panel_vres) {
		/* Load Vertical Scaling Factor */
		switch (viaparinfo->chip_info->gfx_chip_name) {
		case UNICHROME_CLE266:
		case UNICHROME_K400:
			reg_value =
			    CLE266_LCD_VER_SCF_FORMULA(set_vres, panel_vres);
			viafb_load_reg_num =
			    lcd_scaling_factor_CLE.lcd_ver_scaling_factor.
			    reg_num;
			reg = lcd_scaling_factor_CLE.lcd_ver_scaling_factor.reg;
			viafb_load_reg(reg_value,
				viafb_load_reg_num, reg, VIACR);
			break;
		case UNICHROME_K800:
		case UNICHROME_PM800:
		case UNICHROME_CN700:
		case UNICHROME_CX700:
		case UNICHROME_K8M890:
		case UNICHROME_P4M890:
		case UNICHROME_P4M900:
		case UNICHROME_CN750:
		case UNICHROME_VX800:
		case UNICHROME_VX855:
		case UNICHROME_VX900:
			reg_value =
			    K800_LCD_VER_SCF_FORMULA(set_vres, panel_vres);
			/* Vertical scaling enabled */
			viafb_write_reg_mask(CRA2, VIACR, 0x08, BIT3);
			viafb_load_reg_num =
			    lcd_scaling_factor.lcd_ver_scaling_factor.reg_num;
			reg = lcd_scaling_factor.lcd_ver_scaling_factor.reg;
			viafb_load_reg(reg_value,
				viafb_load_reg_num, reg, VIACR);
			break;
		}

		DEBUG_MSG(KERN_INFO "Vertical Scaling value = %d", reg_value);
	} else {
		/* Vertical scaling disabled */
		viafb_write_reg_mask(CRA2, VIACR, 0x00, BIT3);
	}
}

static void via_pitch_alignment_patch_lcd(int iga_path, int hres, int bpp)
{
	unsigned char cr13, cr35, cr65, cr66, cr67;
	unsigned long dwScreenPitch = 0;
	unsigned long dwPitch;

	dwPitch = hres * (bpp >> 3);
	if (dwPitch & 0x1F) {
		dwScreenPitch = ((dwPitch + 31) & ~31) >> 3;
		if (iga_path == IGA2) {
			if (bpp > 8) {
				cr66 = (unsigned char)(dwScreenPitch & 0xFF);
				viafb_write_reg(CR66, VIACR, cr66);
				cr67 = viafb_read_reg(VIACR, CR67) & 0xFC;
				cr67 |=
				    (unsigned
				     char)((dwScreenPitch & 0x300) >> 8);
				viafb_write_reg(CR67, VIACR, cr67);
			}

			/* Fetch Count */
			cr67 = viafb_read_reg(VIACR, CR67) & 0xF3;
			cr67 |= (unsigned char)((dwScreenPitch & 0x600) >> 7);
			viafb_write_reg(CR67, VIACR, cr67);
			cr65 = (unsigned char)((dwScreenPitch >> 1) & 0xFF);
			cr65 += 2;
			viafb_write_reg(CR65, VIACR, cr65);
		} else {
			if (bpp > 8) {
				cr13 = (unsigned char)(dwScreenPitch & 0xFF);
				viafb_write_reg(CR13, VIACR, cr13);
				cr35 = viafb_read_reg(VIACR, CR35) & 0x1F;
				cr35 |=
				    (unsigned
				     char)((dwScreenPitch & 0x700) >> 3);
				viafb_write_reg(CR35, VIACR, cr35);
			}
		}
	}
}
static void lcd_patch_skew_dvp0(struct lvds_setting_information
			 *plvds_setting_info,
			 struct lvds_chip_information *plvds_chip_info)
{
	if (VT1636_LVDS == plvds_chip_info->lvds_chip_name) {
		switch (viaparinfo->chip_info->gfx_chip_name) {
		case UNICHROME_P4M900:
			viafb_vt1636_patch_skew_on_vt3364(plvds_setting_info,
						    plvds_chip_info);
			break;
		case UNICHROME_P4M890:
			viafb_vt1636_patch_skew_on_vt3327(plvds_setting_info,
						    plvds_chip_info);
			break;
		}
	}
}
static void lcd_patch_skew_dvp1(struct lvds_setting_information
			 *plvds_setting_info,
			 struct lvds_chip_information *plvds_chip_info)
{
	if (VT1636_LVDS == plvds_chip_info->lvds_chip_name) {
		switch (viaparinfo->chip_info->gfx_chip_name) {
		case UNICHROME_CX700:
			viafb_vt1636_patch_skew_on_vt3324(plvds_setting_info,
						    plvds_chip_info);
			break;
		}
	}
}
static void lcd_patch_skew(struct lvds_setting_information
	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info)
{
	DEBUG_MSG(KERN_INFO "lcd_patch_skew\n");
	switch (plvds_chip_info->output_interface) {
	case INTERFACE_DVP0:
		lcd_patch_skew_dvp0(plvds_setting_info, plvds_chip_info);
		break;
	case INTERFACE_DVP1:
		lcd_patch_skew_dvp1(plvds_setting_info, plvds_chip_info);
		break;
	case INTERFACE_DFP_LOW:
		if (UNICHROME_P4M900 == viaparinfo->chip_info->gfx_chip_name) {
			viafb_write_reg_mask(CR99, VIACR, 0x08,
				       BIT0 + BIT1 + BIT2 + BIT3);
		}
		break;
	}
}

/* LCD Set Mode */
void viafb_lcd_set_mode(const struct fb_var_screeninfo *var, u16 cxres,
	u16 cyres, struct lvds_setting_information *plvds_setting_info,
	struct lvds_chip_information *plvds_chip_info)
{
	int set_iga = plvds_setting_info->iga_path;
	int mode_bpp = var->bits_per_pixel;
	int set_hres = cxres ? cxres : var->xres;
	int set_vres = cyres ? cyres : var->yres;
	int panel_hres = plvds_setting_info->lcd_panel_hres;
	int panel_vres = plvds_setting_info->lcd_panel_vres;
	u32 clock;
	struct via_display_timing timing;
	struct fb_var_screeninfo panel_var;
	const struct fb_videomode *panel_crt_table;

	DEBUG_MSG(KERN_INFO "viafb_lcd_set_mode!!\n");
	/* Get panel table Pointer */
	panel_crt_table = viafb_get_best_mode(panel_hres, panel_vres, 60);
	viafb_fill_var_timing_info(&panel_var, panel_crt_table);
	DEBUG_MSG(KERN_INFO "below viafb_lcd_set_mode!!\n");
	if (VT1636_LVDS == plvds_chip_info->lvds_chip_name)
		viafb_init_lvds_vt1636(plvds_setting_info, plvds_chip_info);
	clock = PICOS2KHZ(panel_crt_table->pixclock) * 1000;
	plvds_setting_info->vclk = clock;

	if (set_iga == IGA2 && (set_hres < panel_hres || set_vres < panel_vres)
		&& plvds_setting_info->display_method == LCD_EXPANDSION) {
		timing = var_to_timing(&panel_var, panel_hres, panel_vres);
		load_lcd_scaling(set_hres, set_vres, panel_hres, panel_vres);
	} else {
		timing = var_to_timing(&panel_var, set_hres, set_vres);
		if (set_iga == IGA2)
			/* disable scaling */
			via_write_reg_mask(VIACR, 0x79, 0x00,
				BIT0 + BIT1 + BIT2);
	}

	if (set_iga == IGA1)
		via_set_primary_timing(&timing);
	else if (set_iga == IGA2)
		via_set_secondary_timing(&timing);

	/* Fetch count for IGA2 only */
	viafb_load_fetch_count_reg(set_hres, mode_bpp / 8, set_iga);

	if ((viaparinfo->chip_info->gfx_chip_name != UNICHROME_CLE266)
		&& (viaparinfo->chip_info->gfx_chip_name != UNICHROME_K400))
		viafb_load_FIFO_reg(set_iga, set_hres, set_vres);

	fill_lcd_format();
	viafb_set_vclock(clock, set_iga);
	lcd_patch_skew(plvds_setting_info, plvds_chip_info);

	/* If K8M800, enable LCD Prefetch Mode. */
	if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_K800)
	    || (UNICHROME_K8M890 == viaparinfo->chip_info->gfx_chip_name))
		viafb_write_reg_mask(CR6A, VIACR, 0x01, BIT0);

	/* Patch for non 32bit alignment mode */
	via_pitch_alignment_patch_lcd(plvds_setting_info->iga_path, set_hres,
		var->bits_per_pixel);
}

static void integrated_lvds_disable(struct lvds_setting_information
			     *plvds_setting_info,
			     struct lvds_chip_information *plvds_chip_info)
{
	bool turn_off_first_powersequence = false;
	bool turn_off_second_powersequence = false;
	if (INTERFACE_LVDS0LVDS1 == plvds_chip_info->output_interface)
		turn_off_first_powersequence = true;
	if (INTERFACE_LVDS0 == plvds_chip_info->output_interface)
		turn_off_first_powersequence = true;
	if (INTERFACE_LVDS1 == plvds_chip_info->output_interface)
		turn_off_second_powersequence = true;
	if (turn_off_second_powersequence) {
		/* Use second power sequence control: */

		/* Turn off power sequence. */
		viafb_write_reg_mask(CRD4, VIACR, 0, BIT1);

		/* Turn off back light. */
		viafb_write_reg_mask(CRD3, VIACR, 0xC0, BIT6 + BIT7);
	}
	if (turn_off_first_powersequence) {
		/* Use first power sequence control: */

		/* Turn off power sequence. */
		viafb_write_reg_mask(CR6A, VIACR, 0, BIT3);

		/* Turn off back light. */
		viafb_write_reg_mask(CR91, VIACR, 0xC0, BIT6 + BIT7);
	}

	/* Power off LVDS channel. */
	switch (plvds_chip_info->output_interface) {
	case INTERFACE_LVDS0:
		{
			viafb_write_reg_mask(CRD2, VIACR, 0x80, BIT7);
			break;
		}

	case INTERFACE_LVDS1:
		{
			viafb_write_reg_mask(CRD2, VIACR, 0x40, BIT6);
			break;
		}

	case INTERFACE_LVDS0LVDS1:
		{
			viafb_write_reg_mask(CRD2, VIACR, 0xC0, BIT6 + BIT7);
			break;
		}
	}
}

static void integrated_lvds_enable(struct lvds_setting_information
			    *plvds_setting_info,
			    struct lvds_chip_information *plvds_chip_info)
{
	DEBUG_MSG(KERN_INFO "integrated_lvds_enable, out_interface:%d\n",
		  plvds_chip_info->output_interface);
	if (plvds_setting_info->lcd_mode == LCD_SPWG)
		viafb_write_reg_mask(CRD2, VIACR, 0x00, BIT0 + BIT1);
	else
		viafb_write_reg_mask(CRD2, VIACR, 0x03, BIT0 + BIT1);

	switch (plvds_chip_info->output_interface) {
	case INTERFACE_LVDS0LVDS1:
	case INTERFACE_LVDS0:
		/* Use first power sequence control: */
		/* Use hardware control power sequence. */
		viafb_write_reg_mask(CR91, VIACR, 0, BIT0);
		/* Turn on back light. */
		viafb_write_reg_mask(CR91, VIACR, 0, BIT6 + BIT7);
		/* Turn on hardware power sequence. */
		viafb_write_reg_mask(CR6A, VIACR, 0x08, BIT3);
		break;
	case INTERFACE_LVDS1:
		/* Use second power sequence control: */
		/* Use hardware control power sequence. */
		viafb_write_reg_mask(CRD3, VIACR, 0, BIT0);
		/* Turn on back light. */
		viafb_write_reg_mask(CRD3, VIACR, 0, BIT6 + BIT7);
		/* Turn on hardware power sequence. */
		viafb_write_reg_mask(CRD4, VIACR, 0x02, BIT1);
		break;
	}

	/* Power on LVDS channel. */
	switch (plvds_chip_info->output_interface) {
	case INTERFACE_LVDS0:
		{
			viafb_write_reg_mask(CRD2, VIACR, 0, BIT7);
			break;
		}

	case INTERFACE_LVDS1:
		{
			viafb_write_reg_mask(CRD2, VIACR, 0, BIT6);
			break;
		}

	case INTERFACE_LVDS0LVDS1:
		{
			viafb_write_reg_mask(CRD2, VIACR, 0, BIT6 + BIT7);
			break;
		}
	}
}

void viafb_lcd_disable(void)
{

	if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
		lcd_powersequence_off();
		/* DI1 pad off */
		viafb_write_reg_mask(SR1E, VIASR, 0x00, 0x30);
	} else if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) {
		if (viafb_LCD2_ON
		    && (INTEGRATED_LVDS ==
			viaparinfo->chip_info->lvds_chip_info2.lvds_chip_name))
			integrated_lvds_disable(viaparinfo->lvds_setting_info,
				&viaparinfo->chip_info->lvds_chip_info2);
		if (INTEGRATED_LVDS ==
			viaparinfo->chip_info->lvds_chip_info.lvds_chip_name)
			integrated_lvds_disable(viaparinfo->lvds_setting_info,
				&viaparinfo->chip_info->lvds_chip_info);
		if (VT1636_LVDS == viaparinfo->chip_info->
			lvds_chip_info.lvds_chip_name)
			viafb_disable_lvds_vt1636(viaparinfo->lvds_setting_info,
				&viaparinfo->chip_info->lvds_chip_info);
	} else if (VT1636_LVDS ==
	viaparinfo->chip_info->lvds_chip_info.lvds_chip_name) {
		viafb_disable_lvds_vt1636(viaparinfo->lvds_setting_info,
				    &viaparinfo->chip_info->lvds_chip_info);
	} else {
		/* Backlight off           */
		viafb_write_reg_mask(SR3D, VIASR, 0x00, 0x20);
		/* 24 bit DI data paht off */
		viafb_write_reg_mask(CR91, VIACR, 0x80, 0x80);
	}

	/* Disable expansion bit   */
	viafb_write_reg_mask(CR79, VIACR, 0x00, 0x01);
	/* Simultaneout disabled   */
	viafb_write_reg_mask(CR6B, VIACR, 0x00, 0x08);
}

static void set_lcd_output_path(int set_iga, int output_interface)
{
	switch (output_interface) {
	case INTERFACE_DFP:
		if ((UNICHROME_K8M890 == viaparinfo->chip_info->gfx_chip_name)
		    || (UNICHROME_P4M890 ==
		    viaparinfo->chip_info->gfx_chip_name))
			viafb_write_reg_mask(CR97, VIACR, 0x84,
				       BIT7 + BIT2 + BIT1 + BIT0);
		fallthrough;
	case INTERFACE_DVP0:
	case INTERFACE_DVP1:
	case INTERFACE_DFP_HIGH:
	case INTERFACE_DFP_LOW:
		if (set_iga == IGA2)
			viafb_write_reg(CR91, VIACR, 0x00);
		break;
	}
}

void viafb_lcd_enable(void)
{
	viafb_write_reg_mask(CR6B, VIACR, 0x00, BIT3);
	viafb_write_reg_mask(CR6A, VIACR, 0x08, BIT3);
	set_lcd_output_path(viaparinfo->lvds_setting_info->iga_path,
		viaparinfo->chip_info->lvds_chip_info.output_interface);
	if (viafb_LCD2_ON)
		set_lcd_output_path(viaparinfo->lvds_setting_info2->iga_path,
			viaparinfo->chip_info->
			lvds_chip_info2.output_interface);

	if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
		/* DI1 pad on */
		viafb_write_reg_mask(SR1E, VIASR, 0x30, 0x30);
		lcd_powersequence_on();
	} else if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) {
		if (viafb_LCD2_ON && (INTEGRATED_LVDS ==
			viaparinfo->chip_info->lvds_chip_info2.lvds_chip_name))
			integrated_lvds_enable(viaparinfo->lvds_setting_info2, \
				&viaparinfo->chip_info->lvds_chip_info2);
		if (INTEGRATED_LVDS ==
			viaparinfo->chip_info->lvds_chip_info.lvds_chip_name)
			integrated_lvds_enable(viaparinfo->lvds_setting_info,
				&viaparinfo->chip_info->lvds_chip_info);
		if (VT1636_LVDS == viaparinfo->chip_info->
			lvds_chip_info.lvds_chip_name)
			viafb_enable_lvds_vt1636(viaparinfo->
			lvds_setting_info, &viaparinfo->chip_info->
			lvds_chip_info);
	} else if (VT1636_LVDS ==
	viaparinfo->chip_info->lvds_chip_info.lvds_chip_name) {
		viafb_enable_lvds_vt1636(viaparinfo->lvds_setting_info,
				   &viaparinfo->chip_info->lvds_chip_info);
	} else {
		/* Backlight on            */
		viafb_write_reg_mask(SR3D, VIASR, 0x20, 0x20);
		/* 24 bit DI data paht on  */
		viafb_write_reg_mask(CR91, VIACR, 0x00, 0x80);
		/* LCD enabled             */
		viafb_write_reg_mask(CR6A, VIACR, 0x48, 0x48);
	}
}

static void lcd_powersequence_off(void)
{
	int i, mask, data;

	/* Software control power sequence */
	viafb_write_reg_mask(CR91, VIACR, 0x11, 0x11);

	for (i = 0; i < 3; i++) {
		mask = PowerSequenceOff[0][i];
		data = PowerSequenceOff[1][i] & mask;
		viafb_write_reg_mask(CR91, VIACR, (u8) data, (u8) mask);
		udelay(PowerSequenceOff[2][i]);
	}

	/* Disable LCD */
	viafb_write_reg_mask(CR6A, VIACR, 0x00, 0x08);
}

static void lcd_powersequence_on(void)
{
	int i, mask, data;

	/* Software control power sequence */
	viafb_write_reg_mask(CR91, VIACR, 0x11, 0x11);

	/* Enable LCD */
	viafb_write_reg_mask(CR6A, VIACR, 0x08, 0x08);

	for (i = 0; i < 3; i++) {
		mask = PowerSequenceOn[0][i];
		data = PowerSequenceOn[1][i] & mask;
		viafb_write_reg_mask(CR91, VIACR, (u8) data, (u8) mask);
		udelay(PowerSequenceOn[2][i]);
	}

	udelay(1);
}

static void fill_lcd_format(void)
{
	u8 bdithering = 0, bdual = 0;

	if (viaparinfo->lvds_setting_info->device_lcd_dualedge)
		bdual = BIT4;
	if (viaparinfo->lvds_setting_info->LCDDithering)
		bdithering = BIT0;
	/* Dual & Dithering */
	viafb_write_reg_mask(CR88, VIACR, (bdithering | bdual), BIT4 + BIT0);
}

static void check_diport_of_integrated_lvds(
	struct lvds_chip_information *plvds_chip_info,
				     struct lvds_setting_information
				     *plvds_setting_info)
{
	/* Determine LCD DI Port by hardware layout. */
	switch (viafb_display_hardware_layout) {
	case HW_LAYOUT_LCD_ONLY:
		{
			if (plvds_setting_info->device_lcd_dualedge) {
				plvds_chip_info->output_interface =
				    INTERFACE_LVDS0LVDS1;
			} else {
				plvds_chip_info->output_interface =
				    INTERFACE_LVDS0;
			}

			break;
		}

	case HW_LAYOUT_DVI_ONLY:
		{
			plvds_chip_info->output_interface = INTERFACE_NONE;
			break;
		}

	case HW_LAYOUT_LCD1_LCD2:
	case HW_LAYOUT_LCD_EXTERNAL_LCD2:
		{
			plvds_chip_info->output_interface =
			    INTERFACE_LVDS0LVDS1;
			break;
		}

	case HW_LAYOUT_LCD_DVI:
		{
			plvds_chip_info->output_interface = INTERFACE_LVDS1;
			break;
		}

	default:
		{
			plvds_chip_info->output_interface = INTERFACE_LVDS1;
			break;
		}
	}

	DEBUG_MSG(KERN_INFO
		  "Display Hardware Layout: 0x%x, LCD DI Port: 0x%x\n",
		  viafb_display_hardware_layout,
		  plvds_chip_info->output_interface);
}

void viafb_init_lvds_output_interface(struct lvds_chip_information
				*plvds_chip_info,
				struct lvds_setting_information
				*plvds_setting_info)
{
	if (INTERFACE_NONE != plvds_chip_info->output_interface) {
		/*Do nothing, lcd port is specified by module parameter */
		return;
	}

	switch (plvds_chip_info->lvds_chip_name) {

	case VT1636_LVDS:
		switch (viaparinfo->chip_info->gfx_chip_name) {
		case UNICHROME_CX700:
			plvds_chip_info->output_interface = INTERFACE_DVP1;
			break;
		case UNICHROME_CN700:
			plvds_chip_info->output_interface = INTERFACE_DFP_LOW;
			break;
		default:
			plvds_chip_info->output_interface = INTERFACE_DVP0;
			break;
		}
		break;

	case INTEGRATED_LVDS:
		check_diport_of_integrated_lvds(plvds_chip_info,
						plvds_setting_info);
		break;

	default:
		switch (viaparinfo->chip_info->gfx_chip_name) {
		case UNICHROME_K8M890:
		case UNICHROME_P4M900:
		case UNICHROME_P4M890:
			plvds_chip_info->output_interface = INTERFACE_DFP_LOW;
			break;
		default:
			plvds_chip_info->output_interface = INTERFACE_DFP;
			break;
		}
		break;
	}
}

bool viafb_lcd_get_mobile_state(bool *mobile)
{
	unsigned char __iomem *romptr, *tableptr, *biosptr;
	u8 core_base;
	/* Rom address */
	const u32 romaddr = 0x000C0000;
	u16 start_pattern;

	biosptr = ioremap(romaddr, 0x10000);
	start_pattern = readw(biosptr);

	/* Compare pattern */
	if (start_pattern == 0xAA55) {
		/* Get the start of Table */
		/* 0x1B means BIOS offset position */
		romptr = biosptr + 0x1B;
		tableptr = biosptr + readw(romptr);

		/* Get the start of biosver structure */
		/* 18 means BIOS version position. */
		romptr = tableptr + 18;
		romptr = biosptr + readw(romptr);

		/* The offset should be 44, but the
		   actual image is less three char. */
		/* pRom += 44; */
		romptr += 41;

		core_base = readb(romptr);

		if (core_base & 0x8)
			*mobile = false;
		else
			*mobile = true;
		/* release memory */
		iounmap(biosptr);

		return true;
	} else {
		iounmap(biosptr);
		return false;
	}
}