From d4653bf946a5856a17342cd47c47d10b16b1cc22 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Mon, 14 Jul 2008 22:38:29 +0200 Subject: [PATCH] i2c/eeprom: Only probe buses with DDC or SPD class The eeprom driver shouldn't probe i2c buses which don't want to be probed. Signed-off-by: Jean Delvare --- drivers/i2c/chips/eeprom.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c index 7dee001e5133..213a9f98decc 100644 --- a/drivers/i2c/chips/eeprom.c +++ b/drivers/i2c/chips/eeprom.c @@ -159,6 +159,8 @@ static struct bin_attribute eeprom_attr = { static int eeprom_attach_adapter(struct i2c_adapter *adapter) { + if (!(adapter->class & (I2C_CLASS_DDC | I2C_CLASS_SPD))) + return 0; return i2c_probe(adapter, &addr_data, eeprom_detect); } @@ -169,6 +171,12 @@ static int eeprom_detect(struct i2c_adapter *adapter, int address, int kind) struct eeprom_data *data; int err = 0; + /* EDID EEPROMs are often 24C00 EEPROMs, which answer to all + addresses 0x50-0x57, but we only care about 0x50. So decline + attaching to addresses >= 0x51 on DDC buses */ + if (!(adapter->class & I2C_CLASS_SPD) && address >= 0x51) + goto exit; + /* There are three ways we can read the EEPROM data: (1) I2C block reads (faster, but unsupported by most adapters) (2) Consecutive byte reads (100% overhead) -- GitLab