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hwmon: (it87) Reapply probe path chip registers settings after resume 

After a suspend / resume cycle we possibly need to reapply chip registers
settings that we had set or fixed in a probe path, since they might have
been reset to default values or set incorrectly by a BIOS again.

Tested on a Gigabyte M720-US3 board, which requires routing internal VCCH5V
to in7 (and had it wrong again on resume from S3).

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
[groeck: Return value from it87_resume_sio() is unused; make it void]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Maciej S. Szmigiero 2017-08-09 17:15:46 +02:00 committed by Guenter Roeck
parent 557cbf49d2
commit 384548e569
1 changed files with 74 additions and 2 deletions
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76
drivers/hwmon/it87.c
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@ -497,12 +497,14 @@ static const struct it87_devices it87_devices[] = {
#define has_vin3_5v(data) ((data)->features & FEAT_VIN3_5V)
struct it87_sio_data {
int sioaddr;
enum chips type;
/* Values read from Super-I/O config space */
u8 revision;
u8 vid_value;
u8 beep_pin;
u8 internal; /* Internal sensors can be labeled */
bool need_in7_reroute;
/* Features skipped based on config or DMI */
u16 skip_in;
u8 skip_vid;
@ -517,6 +519,7 @@ struct it87_sio_data {
*/
struct it87_data {
const struct attribute_group *groups[7];
int sioaddr;
enum chips type;
u32 features;
u8 peci_mask;
@ -532,6 +535,7 @@ struct it87_data {
u16 in_internal; /* Bitfield, internal sensors (for labels) */
u16 has_in; /* Bitfield, voltage sensors enabled */
u8 in[NUM_VIN][3]; /* [nr][0]=in, [1]=min, [2]=max */
bool need_in7_reroute;
u8 has_fan; /* Bitfield, fans enabled */
u16 fan[NUM_FAN][2]; /* Register values, [nr][0]=fan, [1]=min */
u8 has_temp; /* Bitfield, temp sensors enabled */
@ -2487,6 +2491,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
}
err = 0;
sio_data->sioaddr = sioaddr;
sio_data->revision = superio_inb(sioaddr, DEVREV) & 0x0f;
pr_info("Found IT%04x%s chip at 0x%x, revision %d\n", chip_type,
it87_devices[sio_data->type].suffix,
@ -2575,6 +2580,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
reg2c |= BIT(1);
superio_outb(sioaddr, IT87_SIO_PINX2_REG,
reg2c);
sio_data->need_in7_reroute = true;
pr_notice("Routing internal VCCH5V to in7.\n");
}
pr_notice("in7 routed to internal voltage divider, with external pin disabled.\n");
@ -2777,6 +2783,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
if ((sio_data->type == it8720 || uart6) && !(reg & BIT(1))) {
reg |= BIT(1);
superio_outb(sioaddr, IT87_SIO_PINX2_REG, reg);
sio_data->need_in7_reroute = true;
pr_notice("Routing internal VCCH5V to in7\n");
}
if (reg & BIT(0))
@ -3024,8 +3031,6 @@ static int it87_check_pwm(struct device *dev)
"PWM configuration is too broken to be fixed\n");
}
dev_info(dev,
"Detected broken BIOS defaults, disabling PWM interface\n");
return 0;
} else if (fix_pwm_polarity) {
dev_info(dev,
@ -3058,6 +3063,7 @@ static int it87_probe(struct platform_device *pdev)
return -ENOMEM;
data->addr = res->start;
data->sioaddr = sio_data->sioaddr;
data->type = sio_data->type;
data->features = it87_devices[sio_data->type].features;
data->peci_mask = it87_devices[sio_data->type].peci_mask;
@ -3096,6 +3102,9 @@ static int it87_probe(struct platform_device *pdev)
/* Check PWM configuration */
enable_pwm_interface = it87_check_pwm(dev);
if (!enable_pwm_interface)
dev_info(dev,
"Detected broken BIOS defaults, disabling PWM interface\n");
/* Starting with IT8721F, we handle scaling of internal voltages */
if (has_12mv_adc(data)) {
@ -3123,6 +3132,7 @@ static int it87_probe(struct platform_device *pdev)
}
data->in_internal = sio_data->internal;
data->need_in7_reroute = sio_data->need_in7_reroute;
data->has_in = 0x3ff & ~sio_data->skip_in;
if (has_six_temp(data)) {
@ -3178,9 +3188,71 @@ static int it87_probe(struct platform_device *pdev)
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static void __maybe_unused it87_resume_sio(struct platform_device *pdev)
{
struct it87_data *data = dev_get_drvdata(&pdev->dev);
int err;
int reg2c;
if (!data->need_in7_reroute)
return;
err = superio_enter(data->sioaddr);
if (err) {
dev_warn(&pdev->dev,
"Unable to enter Super I/O to reroute in7 (%d)",
err);
return;
}
superio_select(data->sioaddr, GPIO);
reg2c = superio_inb(data->sioaddr, IT87_SIO_PINX2_REG);
if (!(reg2c & BIT(1))) {
dev_dbg(&pdev->dev,
"Routing internal VCCH5V to in7 again");
reg2c |= BIT(1);
superio_outb(data->sioaddr, IT87_SIO_PINX2_REG,
reg2c);
}
superio_exit(data->sioaddr);
}
static int __maybe_unused it87_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct it87_data *data = dev_get_drvdata(dev);
it87_resume_sio(pdev);
mutex_lock(&data->update_lock);
it87_check_pwm(dev);
it87_check_limit_regs(data);
it87_check_voltage_monitors_reset(data);
it87_check_tachometers_reset(pdev);
it87_check_tachometers_16bit_mode(pdev);
it87_start_monitoring(data);
/* force update */
data->valid = 0;
mutex_unlock(&data->update_lock);
it87_update_device(dev);
return 0;
}
static SIMPLE_DEV_PM_OPS(it87_dev_pm_ops, NULL, it87_resume);
static struct platform_driver it87_driver = {
.driver = {
.name = DRVNAME,
.pm = &it87_dev_pm_ops,
},
.probe = it87_probe,
};