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Always restore previous bank register after reading/writing data

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There is some indication that other entities (BIOS ? EC ?) may access
the chip asynchronously. Restore the bank selection after read/write
operations to limit any potenial impact.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
2017-09-21 15:26:02 -07:00
parent 880d3d6ad7
commit 0e859b5743
1 changed files with 23 additions and 11 deletions
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28
it87.c
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@@ -723,7 +723,6 @@ struct it87_data {
const struct attribute_group *groups[7];
enum chips type;
u32 features;
u8 bank;
u8 peci_mask;
u8 old_peci_mask;
@@ -921,16 +920,21 @@ static void _it87_write_value(struct it87_data *data, u8 reg, u8 value)
outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
}
static void it87_set_bank(struct it87_data *data, u8 bank)
static u8 it87_set_bank(struct it87_data *data, u8 bank)
{
if (has_bank_sel(data) && bank != data->bank) {
u8 _bank = bank;
if (has_bank_sel(data)) {
u8 breg = _it87_read_value(data, IT87_REG_BANK);
_bank = breg >> 5;
if (bank != _bank) {
breg &= 0x1f;
breg |= (bank << 5);
data->bank = bank;
_it87_write_value(data, IT87_REG_BANK, breg);
}
}
return _bank;
}
/*
@@ -940,8 +944,14 @@ static void it87_set_bank(struct it87_data *data, u8 bank)
*/
static int it87_read_value(struct it87_data *data, u16 reg)
{
it87_set_bank(data, reg >> 8);
return _it87_read_value(data, reg & 0xff);
u8 bank;
int val;
bank = it87_set_bank(data, reg >> 8);
val = _it87_read_value(data, reg & 0xff);
it87_set_bank(data, bank);
return val;
}
/*
@@ -951,8 +961,11 @@ static int it87_read_value(struct it87_data *data, u16 reg)
*/
static void it87_write_value(struct it87_data *data, u16 reg, u8 value)
{
it87_set_bank(data, reg >> 8);
u8 bank;
bank = it87_set_bank(data, reg >> 8);
_it87_write_value(data, reg & 0xff, value);
it87_set_bank(data, bank);
}
static void it87_update_pwm_ctrl(struct it87_data *data, int nr)
@@ -3661,7 +3674,6 @@ static int it87_probe(struct platform_device *pdev)
data->pwm_num_temp_map = it87_devices[sio_data->type].num_temp_map;
data->peci_mask = it87_devices[sio_data->type].peci_mask;
data->old_peci_mask = it87_devices[sio_data->type].old_peci_mask;
data->bank = 0xff;
/*
* IT8705F Datasheet 0.4.1, 3h == Version G.