Message-ID: <f1ce1803-4b37-5cd3-465a-34d1ea0c483d@maciej.szmigiero.name>
Date:   Wed, 2 Aug 2017 01:06:57 +0200
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] 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@...iej.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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