6.6-stable review patch. If anyone has any objections, please let me know.
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From: Hans de Goede hdegoede@redhat.com
[ Upstream commit 6b8cffdc4a31e4a72f75ecd1bc13fbf0dafee390 ]
On some designs the chip is not properly reset when powered up at boot or after a suspend/resume cycle.
Use the sw-reset feature to ensure that the chip is in a clean state after probe() / resume() and in the case of resume() restore the settings (scale, trigger-enabled).
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218578 Signed-off-by: Hans de Goede hdegoede@redhat.com Link: https://lore.kernel.org/r/20240326113700.56725-3-hdegoede@redhat.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/accel/mxc4005.c | 68 +++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+)
diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c index 88f0bf2cc1d3f..49e30b87732f5 100644 --- a/drivers/iio/accel/mxc4005.c +++ b/drivers/iio/accel/mxc4005.c @@ -5,6 +5,7 @@ * Copyright (c) 2014, Intel Corporation. */
+#include <linux/delay.h> #include <linux/module.h> #include <linux/i2c.h> #include <linux/iio/iio.h> @@ -36,6 +37,7 @@
#define MXC4005_REG_INT_CLR1 0x01 #define MXC4005_REG_INT_CLR1_BIT_DRDYC 0x01 +#define MXC4005_REG_INT_CLR1_SW_RST 0x10
#define MXC4005_REG_CONTROL 0x0D #define MXC4005_REG_CONTROL_MASK_FSR GENMASK(6, 5) @@ -43,6 +45,9 @@
#define MXC4005_REG_DEVICE_ID 0x0E
+/* Datasheet does not specify a reset time, this is a conservative guess */ +#define MXC4005_RESET_TIME_US 2000 + enum mxc4005_axis { AXIS_X, AXIS_Y, @@ -66,6 +71,8 @@ struct mxc4005_data { s64 timestamp __aligned(8); } scan; bool trigger_enabled; + unsigned int control; + unsigned int int_mask1; };
/* @@ -349,6 +356,7 @@ static int mxc4005_set_trigger_state(struct iio_trigger *trig, return ret; }
+ data->int_mask1 = val; data->trigger_enabled = state; mutex_unlock(&data->mutex);
@@ -384,6 +392,13 @@ static int mxc4005_chip_init(struct mxc4005_data *data)
dev_dbg(data->dev, "MXC4005 chip id %02x\n", reg);
+ ret = regmap_write(data->regmap, MXC4005_REG_INT_CLR1, + MXC4005_REG_INT_CLR1_SW_RST); + if (ret < 0) + return dev_err_probe(data->dev, ret, "resetting chip\n"); + + fsleep(MXC4005_RESET_TIME_US); + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK0, 0); if (ret < 0) return dev_err_probe(data->dev, ret, "writing INT_MASK0\n"); @@ -479,6 +494,58 @@ static int mxc4005_probe(struct i2c_client *client) return devm_iio_device_register(&client->dev, indio_dev); }
+static int mxc4005_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct mxc4005_data *data = iio_priv(indio_dev); + int ret; + + /* Save control to restore it on resume */ + ret = regmap_read(data->regmap, MXC4005_REG_CONTROL, &data->control); + if (ret < 0) + dev_err(data->dev, "failed to read reg_control\n"); + + return ret; +} + +static int mxc4005_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct mxc4005_data *data = iio_priv(indio_dev); + int ret; + + ret = regmap_write(data->regmap, MXC4005_REG_INT_CLR1, + MXC4005_REG_INT_CLR1_SW_RST); + if (ret) { + dev_err(data->dev, "failed to reset chip: %d\n", ret); + return ret; + } + + fsleep(MXC4005_RESET_TIME_US); + + ret = regmap_write(data->regmap, MXC4005_REG_CONTROL, data->control); + if (ret) { + dev_err(data->dev, "failed to restore control register\n"); + return ret; + } + + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK0, 0); + if (ret) { + dev_err(data->dev, "failed to restore interrupt 0 mask\n"); + return ret; + } + + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1, data->int_mask1); + if (ret) { + dev_err(data->dev, "failed to restore interrupt 1 mask\n"); + return ret; + } + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(mxc4005_pm_ops, mxc4005_suspend, mxc4005_resume); + static const struct acpi_device_id mxc4005_acpi_match[] = { {"MXC4005", 0}, {"MXC6655", 0}, @@ -505,6 +572,7 @@ static struct i2c_driver mxc4005_driver = { .name = MXC4005_DRV_NAME, .acpi_match_table = ACPI_PTR(mxc4005_acpi_match), .of_match_table = mxc4005_of_match, + .pm = pm_sleep_ptr(&mxc4005_pm_ops), }, .probe = mxc4005_probe, .id_table = mxc4005_id,