From: Maciej S. Szmigiero Date: Wed, 9 Aug 2017 15:15:46 +0000 (+0200) Subject: hwmon: (it87) Reapply probe path chip registers settings after resume X-Git-Tag: v4.14-rc1~177^2~19 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=384548e569c82dc1e018dcdfd7e19c4b9f87c6b5;p=platform%2Fkernel%2Flinux-rpi.git 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 [groeck: Return value from it87_resume_sio() is unused; make it void] Signed-off-by: Guenter Roeck --- diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 818f123..f8499cb 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 */ + 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, };