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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-01-18 08:56:23 +07:00
iio: adc: stm32-dfsdm: add PM support
Add PM and runtime PM support to STM32 DFSDM drivers: - stm32-dfsdm-core: manage clocks. - stm32-dfsdm-adc: restore channels configuration upon resume. Also stop restart everything in case of buffer mode. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Fabrice Gasnier
Jonathan Cameron
parent
9f57110d2e
commit
6ec417d2f1
@ -868,24 +868,18 @@ static int stm32_dfsdm_update_scan_mode(struct iio_dev *indio_dev,
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return 0;
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}
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static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
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static int __stm32_dfsdm_postenable(struct iio_dev *indio_dev)
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{
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struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
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int ret;
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if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
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ret = iio_triggered_buffer_postenable(indio_dev);
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if (ret < 0)
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return ret;
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}
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/* Reset adc buffer index */
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adc->bufi = 0;
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if (adc->hwc) {
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ret = iio_hw_consumer_enable(adc->hwc);
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if (ret < 0)
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goto err_predisable;
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return ret;
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}
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ret = stm32_dfsdm_start_dfsdm(adc->dfsdm);
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@ -913,6 +907,26 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
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err_stop_hwc:
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if (adc->hwc)
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iio_hw_consumer_disable(adc->hwc);
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return ret;
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}
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static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
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{
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int ret;
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if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
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ret = iio_triggered_buffer_postenable(indio_dev);
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if (ret < 0)
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return ret;
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}
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ret = __stm32_dfsdm_postenable(indio_dev);
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if (ret < 0)
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goto err_predisable;
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return 0;
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err_predisable:
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if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
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iio_triggered_buffer_predisable(indio_dev);
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@ -920,7 +934,7 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
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return ret;
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}
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static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
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static void __stm32_dfsdm_predisable(struct iio_dev *indio_dev)
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{
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struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
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@ -932,6 +946,11 @@ static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
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if (adc->hwc)
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iio_hw_consumer_disable(adc->hwc);
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}
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static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
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{
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__stm32_dfsdm_predisable(indio_dev);
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if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
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iio_triggered_buffer_predisable(indio_dev);
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@ -1496,10 +1515,48 @@ static int stm32_dfsdm_adc_remove(struct platform_device *pdev)
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return 0;
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}
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static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev)
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{
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struct stm32_dfsdm_adc *adc = dev_get_drvdata(dev);
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struct iio_dev *indio_dev = iio_priv_to_dev(adc);
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if (iio_buffer_enabled(indio_dev))
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__stm32_dfsdm_predisable(indio_dev);
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return 0;
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}
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static int __maybe_unused stm32_dfsdm_adc_resume(struct device *dev)
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{
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struct stm32_dfsdm_adc *adc = dev_get_drvdata(dev);
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struct iio_dev *indio_dev = iio_priv_to_dev(adc);
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const struct iio_chan_spec *chan;
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struct stm32_dfsdm_channel *ch;
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int i, ret;
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/* restore channels configuration */
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for (i = 0; i < indio_dev->num_channels; i++) {
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chan = indio_dev->channels + i;
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ch = &adc->dfsdm->ch_list[chan->channel];
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ret = stm32_dfsdm_chan_configure(adc->dfsdm, ch);
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if (ret)
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return ret;
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}
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if (iio_buffer_enabled(indio_dev))
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__stm32_dfsdm_postenable(indio_dev);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(stm32_dfsdm_adc_pm_ops,
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stm32_dfsdm_adc_suspend, stm32_dfsdm_adc_resume);
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static struct platform_driver stm32_dfsdm_adc_driver = {
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.driver = {
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.name = "stm32-dfsdm-adc",
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.of_match_table = stm32_dfsdm_adc_match,
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.pm = &stm32_dfsdm_adc_pm_ops,
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},
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.probe = stm32_dfsdm_adc_probe,
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.remove = stm32_dfsdm_adc_remove,
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@ -12,6 +12,8 @@
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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@ -90,6 +92,36 @@ struct dfsdm_priv {
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struct clk *aclk; /* audio clock */
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};
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static inline struct dfsdm_priv *to_stm32_dfsdm_priv(struct stm32_dfsdm *dfsdm)
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{
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return container_of(dfsdm, struct dfsdm_priv, dfsdm);
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}
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static int stm32_dfsdm_clk_prepare_enable(struct stm32_dfsdm *dfsdm)
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{
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struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);
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int ret;
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ret = clk_prepare_enable(priv->clk);
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if (ret || !priv->aclk)
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return ret;
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ret = clk_prepare_enable(priv->aclk);
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if (ret)
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clk_disable_unprepare(priv->clk);
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return ret;
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}
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static void stm32_dfsdm_clk_disable_unprepare(struct stm32_dfsdm *dfsdm)
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{
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struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);
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if (priv->aclk)
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clk_disable_unprepare(priv->aclk);
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clk_disable_unprepare(priv->clk);
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}
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/**
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* stm32_dfsdm_start_dfsdm - start global dfsdm interface.
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*
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@ -98,24 +130,17 @@ struct dfsdm_priv {
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*/
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int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)
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{
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struct dfsdm_priv *priv = container_of(dfsdm, struct dfsdm_priv, dfsdm);
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struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);
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struct device *dev = &priv->pdev->dev;
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unsigned int clk_div = priv->spi_clk_out_div, clk_src;
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int ret;
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if (atomic_inc_return(&priv->n_active_ch) == 1) {
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ret = clk_prepare_enable(priv->clk);
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ret = pm_runtime_get_sync(dev);
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if (ret < 0) {
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dev_err(dev, "Failed to start clock\n");
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pm_runtime_put_noidle(dev);
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goto error_ret;
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}
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if (priv->aclk) {
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ret = clk_prepare_enable(priv->aclk);
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if (ret < 0) {
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dev_err(dev, "Failed to start audio clock\n");
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goto disable_clk;
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}
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}
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/* select clock source, e.g. 0 for "dfsdm" or 1 for "audio" */
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clk_src = priv->aclk ? 1 : 0;
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@ -123,21 +148,21 @@ int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)
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DFSDM_CHCFGR1_CKOUTSRC_MASK,
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DFSDM_CHCFGR1_CKOUTSRC(clk_src));
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if (ret < 0)
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goto disable_aclk;
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goto pm_put;
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/* Output the SPI CLKOUT (if clk_div == 0 clock if OFF) */
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ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
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DFSDM_CHCFGR1_CKOUTDIV_MASK,
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DFSDM_CHCFGR1_CKOUTDIV(clk_div));
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if (ret < 0)
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goto disable_aclk;
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goto pm_put;
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/* Global enable of DFSDM interface */
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ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
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DFSDM_CHCFGR1_DFSDMEN_MASK,
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DFSDM_CHCFGR1_DFSDMEN(1));
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if (ret < 0)
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goto disable_aclk;
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goto pm_put;
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}
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dev_dbg(dev, "%s: n_active_ch %d\n", __func__,
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@ -145,11 +170,8 @@ int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)
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return 0;
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disable_aclk:
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clk_disable_unprepare(priv->aclk);
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disable_clk:
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clk_disable_unprepare(priv->clk);
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pm_put:
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pm_runtime_put_sync(dev);
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error_ret:
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atomic_dec(&priv->n_active_ch);
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@ -165,7 +187,7 @@ EXPORT_SYMBOL_GPL(stm32_dfsdm_start_dfsdm);
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*/
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int stm32_dfsdm_stop_dfsdm(struct stm32_dfsdm *dfsdm)
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{
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struct dfsdm_priv *priv = container_of(dfsdm, struct dfsdm_priv, dfsdm);
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struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);
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int ret;
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if (atomic_dec_and_test(&priv->n_active_ch)) {
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@ -183,9 +205,7 @@ int stm32_dfsdm_stop_dfsdm(struct stm32_dfsdm *dfsdm)
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if (ret < 0)
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return ret;
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clk_disable_unprepare(priv->clk);
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if (priv->aclk)
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clk_disable_unprepare(priv->aclk);
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pm_runtime_put_sync(&priv->pdev->dev);
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}
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dev_dbg(&priv->pdev->dev, "%s: n_active_ch %d\n", __func__,
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atomic_read(&priv->n_active_ch));
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@ -325,14 +345,111 @@ static int stm32_dfsdm_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, dfsdm);
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return devm_of_platform_populate(&pdev->dev);
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ret = stm32_dfsdm_clk_prepare_enable(dfsdm);
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if (ret) {
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dev_err(&pdev->dev, "Failed to start clock\n");
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return ret;
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}
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pm_runtime_get_noresume(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
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if (ret)
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goto pm_put;
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pm_runtime_put(&pdev->dev);
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return 0;
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pm_put:
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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stm32_dfsdm_clk_disable_unprepare(dfsdm);
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return ret;
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}
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static int stm32_dfsdm_core_remove(struct platform_device *pdev)
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{
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struct stm32_dfsdm *dfsdm = platform_get_drvdata(pdev);
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pm_runtime_get_sync(&pdev->dev);
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of_platform_depopulate(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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stm32_dfsdm_clk_disable_unprepare(dfsdm);
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return 0;
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}
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static int __maybe_unused stm32_dfsdm_core_suspend(struct device *dev)
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{
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struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);
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struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);
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int ret;
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ret = pm_runtime_force_suspend(dev);
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if (ret)
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return ret;
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/* Balance devm_regmap_init_mmio_clk() clk_prepare() */
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clk_unprepare(priv->clk);
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return pinctrl_pm_select_sleep_state(dev);
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}
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static int __maybe_unused stm32_dfsdm_core_resume(struct device *dev)
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{
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struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);
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struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);
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int ret;
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ret = pinctrl_pm_select_default_state(dev);
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if (ret)
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return ret;
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ret = clk_prepare(priv->clk);
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if (ret)
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return ret;
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return pm_runtime_force_resume(dev);
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}
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static int __maybe_unused stm32_dfsdm_core_runtime_suspend(struct device *dev)
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{
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struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);
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stm32_dfsdm_clk_disable_unprepare(dfsdm);
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return 0;
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}
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static int __maybe_unused stm32_dfsdm_core_runtime_resume(struct device *dev)
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{
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struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);
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return stm32_dfsdm_clk_prepare_enable(dfsdm);
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}
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static const struct dev_pm_ops stm32_dfsdm_core_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(stm32_dfsdm_core_suspend,
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stm32_dfsdm_core_resume)
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SET_RUNTIME_PM_OPS(stm32_dfsdm_core_runtime_suspend,
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stm32_dfsdm_core_runtime_resume,
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NULL)
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};
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static struct platform_driver stm32_dfsdm_driver = {
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.probe = stm32_dfsdm_probe,
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.remove = stm32_dfsdm_core_remove,
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.driver = {
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.name = "stm32-dfsdm",
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.of_match_table = stm32_dfsdm_of_match,
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.pm = &stm32_dfsdm_core_pm_ops,
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},
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};
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