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259b93b21a
Probing of regulators can be a slow operation and can contribute to slower boot times. This is especially true if a regulator is turned on at probe time (with regulator-boot-on or regulator-always-on) and the regulator requires delays (off-on-time, ramp time, etc). While the overall kernel is not ready to switch to async probe by default, as per the discussion on the mailing lists [1] it is believed that the regulator subsystem is in good shape and we can move regulator drivers over wholesale. There is no way to just magically opt in all regulators (regulators are just normal drivers like platform_driver), so we set PROBE_PREFER_ASYNCHRONOUS for all regulators found in 'drivers/regulator' individually. Given the number of drivers touched and the impossibility to test this ahead of time, it wouldn't be shocking at all if this caused a regression for someone. If there is a regression caused by this patch, it's likely to be one of the cases talked about in [1]. As a "quick fix", drivers involved in the regression could be fixed by changing them to PROBE_FORCE_SYNCHRONOUS. That being said, the correct fix would be to directly fix the problem that caused the issue with async probe. The approach here follows a similar approach that was used for the mmc subsystem several years ago [2]. In fact, I ran nearly the same python script to auto-generate the changes. The only thing I changed was to search for "i2c_driver", "spmi_driver", and "spi_driver" in addition to "platform_driver". [1] https://lore.kernel.org/r/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk [2] https://lore.kernel.org/r/20200903232441.2694866-1-dianders@chromium.org/ Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20230316125351.1.I2a4677392a38db5758dee0788b2cea5872562a82@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
423 lines
13 KiB
C
423 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (c) 2016 MediaTek Inc.
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// Author: Chen Zhong <chen.zhong@mediatek.com>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/mt6397/core.h>
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#include <linux/mfd/mt6323/registers.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/mt6323-regulator.h>
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#include <linux/regulator/of_regulator.h>
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#define MT6323_LDO_MODE_NORMAL 0
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#define MT6323_LDO_MODE_LP 1
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/*
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* MT6323 regulators' information
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*
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* @desc: standard fields of regulator description.
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* @qi: Mask for query enable signal status of regulators
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* @vselon_reg: Register sections for hardware control mode of bucks
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* @vselctrl_reg: Register for controlling the buck control mode.
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* @vselctrl_mask: Mask for query buck's voltage control mode.
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*/
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struct mt6323_regulator_info {
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struct regulator_desc desc;
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u32 qi;
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u32 vselon_reg;
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u32 vselctrl_reg;
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u32 vselctrl_mask;
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u32 modeset_reg;
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u32 modeset_mask;
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};
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#define MT6323_BUCK(match, vreg, min, max, step, volt_ranges, enreg, \
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vosel, vosel_mask, voselon, vosel_ctrl) \
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[MT6323_ID_##vreg] = { \
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.desc = { \
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.name = #vreg, \
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.of_match = of_match_ptr(match), \
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.ops = &mt6323_volt_range_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = MT6323_ID_##vreg, \
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.owner = THIS_MODULE, \
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.n_voltages = (max - min)/step + 1, \
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.linear_ranges = volt_ranges, \
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.n_linear_ranges = ARRAY_SIZE(volt_ranges), \
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.vsel_reg = vosel, \
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.vsel_mask = vosel_mask, \
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.enable_reg = enreg, \
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.enable_mask = BIT(0), \
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}, \
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.qi = BIT(13), \
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.vselon_reg = voselon, \
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.vselctrl_reg = vosel_ctrl, \
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.vselctrl_mask = BIT(1), \
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}
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#define MT6323_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel, \
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vosel_mask, _modeset_reg, _modeset_mask) \
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[MT6323_ID_##vreg] = { \
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.desc = { \
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.name = #vreg, \
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.of_match = of_match_ptr(match), \
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.ops = &mt6323_volt_table_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = MT6323_ID_##vreg, \
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.owner = THIS_MODULE, \
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.n_voltages = ARRAY_SIZE(ldo_volt_table), \
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.volt_table = ldo_volt_table, \
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.vsel_reg = vosel, \
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.vsel_mask = vosel_mask, \
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.enable_reg = enreg, \
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.enable_mask = BIT(enbit), \
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}, \
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.qi = BIT(15), \
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.modeset_reg = _modeset_reg, \
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.modeset_mask = _modeset_mask, \
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}
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#define MT6323_REG_FIXED(match, vreg, enreg, enbit, volt, \
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_modeset_reg, _modeset_mask) \
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[MT6323_ID_##vreg] = { \
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.desc = { \
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.name = #vreg, \
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.of_match = of_match_ptr(match), \
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.ops = &mt6323_volt_fixed_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = MT6323_ID_##vreg, \
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.owner = THIS_MODULE, \
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.n_voltages = 1, \
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.enable_reg = enreg, \
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.enable_mask = BIT(enbit), \
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.min_uV = volt, \
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}, \
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.qi = BIT(15), \
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.modeset_reg = _modeset_reg, \
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.modeset_mask = _modeset_mask, \
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}
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static const struct linear_range buck_volt_range1[] = {
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REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
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};
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static const struct linear_range buck_volt_range2[] = {
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REGULATOR_LINEAR_RANGE(1400000, 0, 0x7f, 12500),
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};
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static const struct linear_range buck_volt_range3[] = {
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REGULATOR_LINEAR_RANGE(500000, 0, 0x3f, 50000),
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};
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static const unsigned int ldo_volt_table1[] = {
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3300000, 3400000, 3500000, 3600000,
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};
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static const unsigned int ldo_volt_table2[] = {
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1500000, 1800000, 2500000, 2800000,
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};
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static const unsigned int ldo_volt_table3[] = {
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1800000, 3300000,
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};
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static const unsigned int ldo_volt_table4[] = {
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3000000, 3300000,
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};
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static const unsigned int ldo_volt_table5[] = {
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1200000, 1300000, 1500000, 1800000, 2000000, 2800000, 3000000, 3300000,
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};
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static const unsigned int ldo_volt_table6[] = {
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1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
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};
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static const unsigned int ldo_volt_table7[] = {
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1200000, 1300000, 1500000, 1800000,
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};
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static const unsigned int ldo_volt_table8[] = {
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1800000, 3000000,
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};
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static const unsigned int ldo_volt_table9[] = {
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1200000, 1350000, 1500000, 1800000,
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};
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static const unsigned int ldo_volt_table10[] = {
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1200000, 1300000, 1500000, 1800000,
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};
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static int mt6323_get_status(struct regulator_dev *rdev)
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{
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int ret;
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u32 regval;
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struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
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ret = regmap_read(rdev->regmap, info->desc.enable_reg, ®val);
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if (ret != 0) {
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dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
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return ret;
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}
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return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
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}
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static int mt6323_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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int ret, val = 0;
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struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
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if (!info->modeset_mask) {
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dev_err(&rdev->dev, "regulator %s doesn't support set_mode\n",
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info->desc.name);
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return -EINVAL;
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}
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switch (mode) {
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case REGULATOR_MODE_STANDBY:
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val = MT6323_LDO_MODE_LP;
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break;
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case REGULATOR_MODE_NORMAL:
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val = MT6323_LDO_MODE_NORMAL;
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break;
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default:
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return -EINVAL;
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}
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val <<= ffs(info->modeset_mask) - 1;
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ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
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info->modeset_mask, val);
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return ret;
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}
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static unsigned int mt6323_ldo_get_mode(struct regulator_dev *rdev)
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{
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unsigned int val;
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unsigned int mode;
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int ret;
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struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
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if (!info->modeset_mask) {
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dev_err(&rdev->dev, "regulator %s doesn't support get_mode\n",
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info->desc.name);
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return -EINVAL;
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}
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ret = regmap_read(rdev->regmap, info->modeset_reg, &val);
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if (ret < 0)
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return ret;
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val &= info->modeset_mask;
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val >>= ffs(info->modeset_mask) - 1;
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if (val & 0x1)
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mode = REGULATOR_MODE_STANDBY;
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else
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mode = REGULATOR_MODE_NORMAL;
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return mode;
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}
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static const struct regulator_ops mt6323_volt_range_ops = {
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mt6323_get_status,
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};
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static const struct regulator_ops mt6323_volt_table_ops = {
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.list_voltage = regulator_list_voltage_table,
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.map_voltage = regulator_map_voltage_iterate,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mt6323_get_status,
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.set_mode = mt6323_ldo_set_mode,
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.get_mode = mt6323_ldo_get_mode,
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};
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static const struct regulator_ops mt6323_volt_fixed_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mt6323_get_status,
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.set_mode = mt6323_ldo_set_mode,
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.get_mode = mt6323_ldo_get_mode,
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};
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/* The array is indexed by id(MT6323_ID_XXX) */
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static struct mt6323_regulator_info mt6323_regulators[] = {
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MT6323_BUCK("buck_vproc", VPROC, 700000, 1493750, 6250,
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buck_volt_range1, MT6323_VPROC_CON7, MT6323_VPROC_CON9, 0x7f,
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MT6323_VPROC_CON10, MT6323_VPROC_CON5),
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MT6323_BUCK("buck_vsys", VSYS, 1400000, 2987500, 12500,
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buck_volt_range2, MT6323_VSYS_CON7, MT6323_VSYS_CON9, 0x7f,
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MT6323_VSYS_CON10, MT6323_VSYS_CON5),
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MT6323_BUCK("buck_vpa", VPA, 500000, 3650000, 50000,
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buck_volt_range3, MT6323_VPA_CON7, MT6323_VPA_CON9,
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0x3f, MT6323_VPA_CON10, MT6323_VPA_CON5),
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MT6323_REG_FIXED("ldo_vtcxo", VTCXO, MT6323_ANALDO_CON1, 10, 2800000,
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MT6323_ANALDO_CON1, 0x2),
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MT6323_REG_FIXED("ldo_vcn28", VCN28, MT6323_ANALDO_CON19, 12, 2800000,
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MT6323_ANALDO_CON20, 0x2),
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MT6323_LDO("ldo_vcn33_bt", VCN33_BT, ldo_volt_table1,
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MT6323_ANALDO_CON16, 7, MT6323_ANALDO_CON16, 0xC,
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MT6323_ANALDO_CON21, 0x2),
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MT6323_LDO("ldo_vcn33_wifi", VCN33_WIFI, ldo_volt_table1,
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MT6323_ANALDO_CON17, 12, MT6323_ANALDO_CON16, 0xC,
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MT6323_ANALDO_CON21, 0x2),
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MT6323_REG_FIXED("ldo_va", VA, MT6323_ANALDO_CON2, 14, 2800000,
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MT6323_ANALDO_CON2, 0x2),
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MT6323_LDO("ldo_vcama", VCAMA, ldo_volt_table2,
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MT6323_ANALDO_CON4, 15, MT6323_ANALDO_CON10, 0x60, -1, 0),
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MT6323_REG_FIXED("ldo_vio28", VIO28, MT6323_DIGLDO_CON0, 14, 2800000,
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MT6323_DIGLDO_CON0, 0x2),
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MT6323_REG_FIXED("ldo_vusb", VUSB, MT6323_DIGLDO_CON2, 14, 3300000,
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MT6323_DIGLDO_CON2, 0x2),
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MT6323_LDO("ldo_vmc", VMC, ldo_volt_table3,
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MT6323_DIGLDO_CON3, 12, MT6323_DIGLDO_CON24, 0x10,
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MT6323_DIGLDO_CON3, 0x2),
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MT6323_LDO("ldo_vmch", VMCH, ldo_volt_table4,
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MT6323_DIGLDO_CON5, 14, MT6323_DIGLDO_CON26, 0x80,
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MT6323_DIGLDO_CON5, 0x2),
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MT6323_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table4,
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MT6323_DIGLDO_CON6, 14, MT6323_DIGLDO_CON27, 0x80,
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MT6323_DIGLDO_CON6, 0x2),
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MT6323_LDO("ldo_vgp1", VGP1, ldo_volt_table5,
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MT6323_DIGLDO_CON7, 15, MT6323_DIGLDO_CON28, 0xE0,
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MT6323_DIGLDO_CON7, 0x2),
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MT6323_LDO("ldo_vgp2", VGP2, ldo_volt_table6,
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MT6323_DIGLDO_CON8, 15, MT6323_DIGLDO_CON29, 0xE0,
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MT6323_DIGLDO_CON8, 0x2),
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MT6323_LDO("ldo_vgp3", VGP3, ldo_volt_table7,
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MT6323_DIGLDO_CON9, 15, MT6323_DIGLDO_CON30, 0x60,
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MT6323_DIGLDO_CON9, 0x2),
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MT6323_REG_FIXED("ldo_vcn18", VCN18, MT6323_DIGLDO_CON11, 14, 1800000,
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MT6323_DIGLDO_CON11, 0x2),
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MT6323_LDO("ldo_vsim1", VSIM1, ldo_volt_table8,
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MT6323_DIGLDO_CON13, 15, MT6323_DIGLDO_CON34, 0x20,
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MT6323_DIGLDO_CON13, 0x2),
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MT6323_LDO("ldo_vsim2", VSIM2, ldo_volt_table8,
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MT6323_DIGLDO_CON14, 15, MT6323_DIGLDO_CON35, 0x20,
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MT6323_DIGLDO_CON14, 0x2),
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MT6323_REG_FIXED("ldo_vrtc", VRTC, MT6323_DIGLDO_CON15, 8, 2800000,
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-1, 0),
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MT6323_LDO("ldo_vcamaf", VCAMAF, ldo_volt_table5,
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MT6323_DIGLDO_CON31, 15, MT6323_DIGLDO_CON32, 0xE0,
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MT6323_DIGLDO_CON31, 0x2),
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MT6323_LDO("ldo_vibr", VIBR, ldo_volt_table5,
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MT6323_DIGLDO_CON39, 15, MT6323_DIGLDO_CON40, 0xE0,
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MT6323_DIGLDO_CON39, 0x2),
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MT6323_REG_FIXED("ldo_vrf18", VRF18, MT6323_DIGLDO_CON45, 15, 1825000,
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MT6323_DIGLDO_CON45, 0x2),
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MT6323_LDO("ldo_vm", VM, ldo_volt_table9,
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MT6323_DIGLDO_CON47, 14, MT6323_DIGLDO_CON48, 0x30,
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MT6323_DIGLDO_CON47, 0x2),
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MT6323_REG_FIXED("ldo_vio18", VIO18, MT6323_DIGLDO_CON49, 14, 1800000,
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MT6323_DIGLDO_CON49, 0x2),
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MT6323_LDO("ldo_vcamd", VCAMD, ldo_volt_table10,
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MT6323_DIGLDO_CON51, 14, MT6323_DIGLDO_CON52, 0x60,
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MT6323_DIGLDO_CON51, 0x2),
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MT6323_REG_FIXED("ldo_vcamio", VCAMIO, MT6323_DIGLDO_CON53, 14, 1800000,
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MT6323_DIGLDO_CON53, 0x2),
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};
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static int mt6323_set_buck_vosel_reg(struct platform_device *pdev)
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{
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struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
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int i;
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u32 regval;
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for (i = 0; i < MT6323_MAX_REGULATOR; i++) {
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if (mt6323_regulators[i].vselctrl_reg) {
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if (regmap_read(mt6323->regmap,
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mt6323_regulators[i].vselctrl_reg,
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®val) < 0) {
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dev_err(&pdev->dev,
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"Failed to read buck ctrl\n");
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return -EIO;
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}
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if (regval & mt6323_regulators[i].vselctrl_mask) {
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mt6323_regulators[i].desc.vsel_reg =
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mt6323_regulators[i].vselon_reg;
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}
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}
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}
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return 0;
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}
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static int mt6323_regulator_probe(struct platform_device *pdev)
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{
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struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
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struct regulator_config config = {};
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struct regulator_dev *rdev;
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int i;
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u32 reg_value;
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/* Query buck controller to select activated voltage register part */
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if (mt6323_set_buck_vosel_reg(pdev))
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return -EIO;
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/* Read PMIC chip revision to update constraints and voltage table */
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if (regmap_read(mt6323->regmap, MT6323_CID, ®_value) < 0) {
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dev_err(&pdev->dev, "Failed to read Chip ID\n");
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return -EIO;
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}
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dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
|
|
|
|
for (i = 0; i < MT6323_MAX_REGULATOR; i++) {
|
|
config.dev = &pdev->dev;
|
|
config.driver_data = &mt6323_regulators[i];
|
|
config.regmap = mt6323->regmap;
|
|
rdev = devm_regulator_register(&pdev->dev,
|
|
&mt6323_regulators[i].desc, &config);
|
|
if (IS_ERR(rdev)) {
|
|
dev_err(&pdev->dev, "failed to register %s\n",
|
|
mt6323_regulators[i].desc.name);
|
|
return PTR_ERR(rdev);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id mt6323_platform_ids[] = {
|
|
{"mt6323-regulator", 0},
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, mt6323_platform_ids);
|
|
|
|
static struct platform_driver mt6323_regulator_driver = {
|
|
.driver = {
|
|
.name = "mt6323-regulator",
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
.probe = mt6323_regulator_probe,
|
|
.id_table = mt6323_platform_ids,
|
|
};
|
|
|
|
module_platform_driver(mt6323_regulator_driver);
|
|
|
|
MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
|
|
MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6323 PMIC");
|
|
MODULE_LICENSE("GPL v2");
|