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Subject[PATCH v3 2/2] hwmon: (it87) Reapply probe path chip registers settings after resume
Date
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>
---
Changes from v1: Move code of common probe / resume steps to new functions
so we don't need to make large parts of probe function conditional on a
newly added 'resume' parameter.

Changes from v2: Code move of common probe / resume steps to new functions
and actual resume functionality split into two, separate patches.

Changed message level about VCCH5V being routed to in7 again on resume to
debug.

Added a "need_in7_reroute" flag and made VCCH5V to in7 rerouting on resume
explicitly conditional on it.

Didn't finally add check for enable_pwm_interface being set before calling
it87_check_pwm() in the resume function since this variable is it87_probe()
function local and so adding this check would require adding it to device
instance structure.

drivers/hwmon/it87.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 80 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 818f123ac475..88f8ad9e2070 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -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 */
+ u8 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 */
+ u8 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 */
@@ -2389,10 +2393,11 @@ static const struct attribute_group it87_group_auto_pwm = {
};

/* SuperIO detection - will change isa_address if a chip is found */
-static int __init it87_find(int sioaddr, unsigned short *address,
+static int __init it87_find(unsigned short *address,
struct it87_sio_data *sio_data)
{
int err;
+ int sioaddr = sio_data->sioaddr;
u16 chip_type;
const char *board_vendor, *board_name;
const struct it87_devices *config;
@@ -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 = 1;
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 = 1;
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 +3188,74 @@ static int it87_probe(struct platform_device *pdev)
return PTR_ERR_OR_ZERO(hwmon_dev);
}

+static int 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 0;
+
+ err = superio_enter(data->sioaddr);
+ if (err)
+ return err;
+
+ 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);
+
+ return 0;
+}
+
+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);
+ int err;
+
+ err = it87_resume_sio(pdev);
+ if (err)
+ dev_err(dev,
+ "Unable to resume Super I/O (%d)",
+ err);
+
+ 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,
};
@@ -3246,8 +3321,9 @@ static int __init sm_it87_init(void)

for (i = 0; i < ARRAY_SIZE(sioaddr); i++) {
memset(&sio_data, 0, sizeof(struct it87_sio_data));
+ sio_data.sioaddr = sioaddr[i];
isa_address[i] = 0;
- err = it87_find(sioaddr[i], &isa_address[i], &sio_data);
+ err = it87_find(&isa_address[i], &sio_data);
if (err || isa_address[i] == 0)
continue;
/*
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