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linux-next/drivers/video/via/vt1636.c
Jonathan Corbet 6b841edf57 via: Rationalize vt1636 detection 
The code was ugly and didn't check whether i2c operations were succeeding;
make it a little better.

Cc: ScottFang@viatech.com.cn
Cc: JosephChan@via.com.tw
Cc: Harald Welte <laforge@gnumonks.org>
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2010-05-07 17:17:38 -06:00

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/*
* Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation;
* either version 2, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE.See the GNU General Public License
* for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "via-core.h"
#include "via_i2c.h"
#include "global.h"
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_TBL_VT1636);
for (i = 0; i < reg_num; i++) {
viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
plvds_chip_info,
COMMON_INIT_TBL_VT1636[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_TBL_VT1636[0]);
} else {
viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
plvds_chip_info,
SINGLE_CHANNEL_ENABLE_TBL_VT1636[0]);
}
if (plvds_setting_info->LCDDithering) {
viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
plvds_chip_info,
DITHERING_ENABLE_TBL_VT1636[0]);
} else {
viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
plvds_chip_info,
DITHERING_DISABLE_TBL_VT1636[0]);
}
}
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_TBL_VT1636[0]);
/* Pad on: */
switch (plvds_chip_info->output_interface) {
case INTERFACE_DVP0:
{
viafb_write_reg_mask(SR1E, VIASR, 0xC0, 0xC0);
break;
}
case INTERFACE_DVP1:
{
viafb_write_reg_mask(SR1E, VIASR, 0x30, 0x30);
break;
}
case INTERFACE_DFP_LOW:
{
viafb_write_reg_mask(SR2A, VIASR, 0x03, 0x03);
break;
}
case INTERFACE_DFP_HIGH:
{
viafb_write_reg_mask(SR2A, VIASR, 0x03, 0x0C);
break;
}
}
}
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_TBL_VT1636[0]);
/* Pad off: */
switch (plvds_chip_info->output_interface) {
case INTERFACE_DVP0:
{
viafb_write_reg_mask(SR1E, VIASR, 0x00, 0xC0);
break;
}
case INTERFACE_DVP1:
{
viafb_write_reg_mask(SR1E, VIASR, 0x00, 0x30);
break;
}
case INTERFACE_DFP_LOW:
{
viafb_write_reg_mask(SR2A, VIASR, 0x00, 0x03);
break;
}
case INTERFACE_DFP_HIGH:
{
viafb_write_reg_mask(SR2A, VIASR, 0x00, 0x0C);
break;
}
}
}
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 int get_lvds_dpa_setting_index(int panel_size_id,
struct VT1636_DPA_SETTING *p_vt1636_dpasetting_tbl,
int tbl_size)
{
int i;
for (i = 0; i < tbl_size; i++) {
if (panel_size_id == p_vt1636_dpasetting_tbl->PanelSizeID)
return i;
p_vt1636_dpasetting_tbl++;
}
return 0;
}
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)
{
int index, size;
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: */
size = ARRAY_SIZE(VT1636_DPA_SETTING_TBL_VT3324);
index =
get_lvds_dpa_setting_index(plvds_setting_info->lcd_panel_id,
VT1636_DPA_SETTING_TBL_VT3324, size);
set_dpa_vt1636(plvds_setting_info, plvds_chip_info,
&VT1636_DPA_SETTING_TBL_VT3324[index]);
}
void viafb_vt1636_patch_skew_on_vt3327(
struct lvds_setting_information *plvds_setting_info,
struct lvds_chip_information *plvds_chip_info)
{
int index, size;
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: */
size = ARRAY_SIZE(VT1636_DPA_SETTING_TBL_VT3327);
index =
get_lvds_dpa_setting_index(plvds_setting_info->lcd_panel_id,
VT1636_DPA_SETTING_TBL_VT3327, size);
set_dpa_vt1636(plvds_setting_info, plvds_chip_info,
&VT1636_DPA_SETTING_TBL_VT3327[index]);
}
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]);
}
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