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hwmon: (it87) Allow disabling exiting of configuration mode 

Disabling configuration mode on some chips can result in system
hang-ups and access failures to the Super-IO chip at the
second SIO address. Never exit configuration mode on these
chips to avoid the problem.

This patch should be applied in conjunction with a previous one to
initialise the second chip for certain mother boards.

Signed-off-by: Frank Crawford <frank@crawford.emu.id.au>
Link: https://lore.kernel.org/r/20230128060308.1549707-2-frank@crawford.emu.id.au
[groeck: Change feature bit from 28 to 19 to be continuous]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Frank Crawford 2023-01-28 17:03:02 +11:00 committed by Guenter Roeck
parent 12087a365f
commit 4119693bd2
1 changed files with 18 additions and 8 deletions
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26
drivers/hwmon/it87.c
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@ -128,10 +128,12 @@ static inline int superio_enter(int ioreg)
return 0;
}
static inline void superio_exit(int ioreg)
static inline void superio_exit(int ioreg, bool noexit)
{
outb(0x02, ioreg);
outb(0x02, ioreg + 1);
if (!noexit) {
outb(0x02, ioreg);
outb(0x02, ioreg + 1);
}
release_region(ioreg, 2);
}
@ -300,6 +302,13 @@ struct it87_devices {
#define FEAT_PWM_FREQ2 BIT(16) /* Separate pwm freq 2 */
#define FEAT_SIX_TEMP BIT(17) /* Up to 6 temp sensors */
#define FEAT_VIN3_5V BIT(18) /* VIN3 connected to +5V */
/*
* Disabling configuration mode on some chips can result in system
* hang-ups and access failures to the Super-IO chip at the
* second SIO address. Never exit configuration mode on these
* chips to avoid the problem.
*/
#define FEAT_CONF_NOEXIT BIT(19) /* Chip should not exit conf mode */
static const struct it87_devices it87_devices[] = {
[it87] = {
@ -493,6 +502,7 @@ static const struct it87_devices it87_devices[] = {
#define has_pwm_freq2(data) ((data)->features & FEAT_PWM_FREQ2)
#define has_six_temp(data) ((data)->features & FEAT_SIX_TEMP)
#define has_vin3_5v(data) ((data)->features & FEAT_VIN3_5V)
#define has_conf_noexit(data) ((data)->features & FEAT_CONF_NOEXIT)
struct it87_sio_data {
int sioaddr;
@ -2404,7 +2414,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
{
int err;
u16 chip_type;
const struct it87_devices *config;
const struct it87_devices *config = NULL;
err = superio_enter(sioaddr);
if (err)
@ -2489,6 +2499,8 @@ static int __init it87_find(int sioaddr, unsigned short *address,
goto exit;
}
config = &it87_devices[sio_data->type];
superio_select(sioaddr, PME);
if (!(superio_inb(sioaddr, IT87_ACT_REG) & 0x01)) {
pr_info("Device not activated, skipping\n");
@ -2508,8 +2520,6 @@ static int __init it87_find(int sioaddr, unsigned short *address,
it87_devices[sio_data->type].suffix,
*address, sio_data->revision);
config = &it87_devices[sio_data->type];
/* in7 (VSB or VCCH5V) is always internal on some chips */
if (has_in7_internal(config))
sio_data->internal |= BIT(1);
@ -2827,7 +2837,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
sio_data->skip_pwm |= dmi_data->skip_pwm;
exit:
superio_exit(sioaddr);
superio_exit(sioaddr, config ? has_conf_noexit(config) : false);
return err;
}
@ -3213,7 +3223,7 @@ static void it87_resume_sio(struct platform_device *pdev)
reg2c);
}
superio_exit(data->sioaddr);
superio_exit(data->sioaddr, has_conf_noexit(data));
}
static int it87_resume(struct device *dev)