From c5df9b7a7c7600e4365e81f64ea44beb5be8bfa7 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Mon, 28 Aug 2006 14:37:54 +0200 Subject: [PATCH] it87: Overwrite broken default limits it87: Overwrite broken default limits Some IT8716F chips where seen with unreasonable defaults for low voltage and high temperature limits. Overwrite them with sane defaults so as to not generate meaningless alarms. Signed-off-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- drivers/hwmon/it87.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 956cd553c71..de62f60bcaf 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -1202,6 +1202,22 @@ static void it87_init_client(struct i2c_client *client, struct it87_data *data) data->manual_pwm_ctl[i] = 0xff; } + /* Some chips seem to have default value 0xff for all limit + * registers. For low voltage limits it makes no sense and triggers + * alarms, so change to 0 instead. For high temperature limits, it + * means -1 degree C, which surprisingly doesn't trigger an alarm, + * but is still confusing, so change to 127 degrees C. */ + for (i = 0; i < 8; i++) { + tmp = it87_read_value(client, IT87_REG_VIN_MIN(i)); + if (tmp == 0xff) + it87_write_value(client, IT87_REG_VIN_MIN(i), 0); + } + for (i = 0; i < 3; i++) { + tmp = it87_read_value(client, IT87_REG_TEMP_HIGH(i)); + if (tmp == 0xff) + it87_write_value(client, IT87_REG_TEMP_HIGH(i), 127); + } + /* Check if temperature channnels are reset manually or by some reason */ tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE); if ((tmp & 0x3f) == 0) { -- 2.41.1