// 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_target_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_target_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_target_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;
        }
}