Re: [PATCH RFT v3 3/4] hwmon: (spd5118) Add suspend/resume support

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Hi,

On 1/6/24 09:05, Guenter Roeck wrote:
Add suspend/resume support to ensure that limit and configuration
registers are updated and synchronized after a suspend/resume cycle.

Cc: Armin Wolf <W_Armin@xxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v3: No change

v2: New patch

RFT: I tested the patch through a suspend/resume cycle, and it seems
      to work, but I am not sure if that had any effect because,
      after all, the memory is still active during suspend/resume.
      I was unable to test a hibernation cycle with my system.


For me, the driver just reports 0°C after suspend/resume, but works fine beforehand, tested on both my desktop and laptop, with kernel 6.9.3 and 6.10.0-rc2 (on the laptop only).

Hibernation does seem to work fine though (at least on 6.9.3).

  drivers/hwmon/spd5118.c | 29 +++++++++++++++++++++++++++++
  1 file changed, 29 insertions(+)

diff --git a/drivers/hwmon/spd5118.c b/drivers/hwmon/spd5118.c
index d3fc0ae17743..baa315172298 100644
--- a/drivers/hwmon/spd5118.c
+++ b/drivers/hwmon/spd5118.c
@@ -20,6 +20,7 @@
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/module.h>
+#include <linux/pm.h>
  #include <linux/regmap.h>
  #include <linux/units.h>
@@ -432,6 +433,8 @@ static int spd5118_probe(struct i2c_client *client)
  	if (!spd5118_vendor_valid(bank, vendor))
  		return -ENODEV;
+ dev_set_drvdata(dev, regmap);
+
  	hwmon_dev = devm_hwmon_device_register_with_info(dev, "spd5118",
  							 regmap, &spd5118_chip_info,
  							 NULL);
@@ -449,6 +452,31 @@ static int spd5118_probe(struct i2c_client *client)
  	return 0;
  }
+static int spd5118_suspend(struct device *dev)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+
+	regcache_cache_bypass(regmap, true);
+	regmap_update_bits(regmap, SPD5118_REG_TEMP_CONFIG, SPD5118_TS_DISABLE,
+			   SPD5118_TS_DISABLE);
+	regcache_cache_bypass(regmap, false);
+
+	regcache_cache_only(regmap, true);
+	regcache_mark_dirty(regmap);
+
+	return 0;
+}
+
+static int spd5118_resume(struct device *dev)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+
+	regcache_cache_only(regmap, false);

Adding something like this fixes the readings after resume for me:

	regmap_update_bits(regmap, SPD5118_REG_TEMP_CONFIG, SPD5118_TS_DISABLE, 0);

But that was just the naive solution I thought of.

+	return regcache_sync(regmap);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(spd5118_pm_ops, spd5118_suspend, spd5118_resume);
+
  static const struct i2c_device_id spd5118_id[] = {
  	{ "spd5118", 0 },
  	{ }
@@ -466,6 +494,7 @@ static struct i2c_driver spd5118_driver = {
  	.driver = {
  		.name	= "spd5118",
  		.of_match_table = spd5118_of_ids,
+		.pm = pm_sleep_ptr(&spd5118_pm_ops),
  	},
  	.probe		= spd5118_probe,
  	.id_table	= spd5118_id,


For reference: I believe both my devices also have Montage Technology M88SPD5118 chips; the desktop has Kingston KF560C36-32 RAM, the laptop has Crucial CT16G56C46S5.

Thanks,
Steve




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