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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>
This commit is contained in:
Jonathan Corbet 2009-12-28 10:22:53 -07:00
parent b8f7e5d846
commit 6b841edf57
1 changed files with 7 additions and 13 deletions
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20
drivers/video/via/vt1636.c
View File

@ -167,26 +167,20 @@ bool viafb_lvds_identify_vt1636(u8 i2c_adapter)
/* Sense VT1636 LVDS Transmiter */
viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
VT1636_LVDS_I2C_ADDR;
VT1636_LVDS_I2C_ADDR;
/* Check vendor ID first: */
viafb_i2c_readbyte(i2c_adapter,
(u8) viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr,
0x00, &Buffer[0]);
viafb_i2c_readbyte(i2c_adapter,
(u8) viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr,
0x01, &Buffer[1]);
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,
(u8) viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr,
0x02, &Buffer[0]);
viafb_i2c_readbyte(i2c_adapter,
(u8) viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr,
0x03, &Buffer[1]);
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;