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power: supply: axp288_fuel_gauge: Take the P-Unit semaphore only once during probe()

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The I2C-bus to the XPower AXP288 is shared between the Linux kernel and
the SoCs P-Unit. The P-Unit has a semaphore which the kernel must "lock"
before it may use the bus. If not explicitly taken by the I2C-driver,
then this semaphore is automatically taken by the I2C-bus-driver for
each I2C-transfer and this is a quite expensive operation.

Explicitly take the semaphore in probe() around the register-accesses
done during probe, so that this only needs to be done once, rather then
once per register-access.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Hans de Goede 2021-08-01 15:31:05 +02:00 committed by Sebastian Reichel
parent 964b3e9b02
commit 213e19d659
1 changed files with 17 additions and 7 deletions
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24
drivers/power/supply/axp288_fuel_gauge.c
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@ -661,31 +661,35 @@ static int axp288_fuel_gauge_probe(struct platform_device *pdev)
}
}
ret = iosf_mbi_block_punit_i2c_access();
if (ret < 0)
goto out_free_iio_chan;
/*
* On some devices the fuelgauge and charger parts of the axp288 are
* not used, check that the fuelgauge is enabled (CC_CTRL != 0).
*/
ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
if (ret < 0)
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
if (val == 0) {
ret = -ENODEV;
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
}
ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
if (ret < 0)
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
if (!(ret & FG_DES_CAP1_VALID)) {
dev_err(&pdev->dev, "axp288 not configured by firmware\n");
ret = -ENODEV;
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
}
ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
if (ret < 0)
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
case CHRG_CCCV_CV_4100MV:
info->max_volt = 4100;
@ -703,14 +707,20 @@ static int axp288_fuel_gauge_probe(struct platform_device *pdev)
ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
if (ret < 0)
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
info->pwr_op = ret;
ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
if (ret < 0)
goto out_free_iio_chan;
goto unblock_punit_i2c_access;
info->low_cap = ret;
unblock_punit_i2c_access:
iosf_mbi_unblock_punit_i2c_access();
/* In case we arrive here by goto because of a register access error */
if (ret < 0)
goto out_free_iio_chan;
psy_cfg.drv_data = info;
info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
if (IS_ERR(info->bat)) {