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spi: stm32-qspi: Add pm_runtime support
By default, STM32_AUTOSUSPEND_DELAY is set to -1 which has for effect to prevent runtime suspends. Runtime suspends can be activated by setting autosuspend_delay_ms using sysfs entry : echo {delay_in_ms} > /sys/devices/platform/soc/58003000.spi/power/autosusp end_delay_ms) Signed-off-by: Christophe Kerello <christophe.kerello@st.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Link: https://lore.kernel.org/r/20200417121241.6473-1-patrice.chotard@st.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -16,6 +16,7 @@
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#include <linux/of.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/platform_device.h>
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#include <linux/reset.h>
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#include <linux/sizes.h>
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@ -87,6 +88,7 @@
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#define STM32_BUSY_TIMEOUT_US 100000
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#define STM32_ABT_TIMEOUT_US 100000
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#define STM32_COMP_TIMEOUT_MS 1000
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#define STM32_AUTOSUSPEND_DELAY -1
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struct stm32_qspi_flash {
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struct stm32_qspi *qspi;
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@ -431,10 +433,17 @@ static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
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struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
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int ret;
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ret = pm_runtime_get_sync(qspi->dev);
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if (ret < 0)
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return ret;
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mutex_lock(&qspi->lock);
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ret = stm32_qspi_send(mem, op);
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mutex_unlock(&qspi->lock);
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pm_runtime_mark_last_busy(qspi->dev);
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pm_runtime_put_autosuspend(qspi->dev);
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return ret;
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}
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@ -444,6 +453,7 @@ static int stm32_qspi_setup(struct spi_device *spi)
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struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl);
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struct stm32_qspi_flash *flash;
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u32 presc;
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int ret;
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if (ctrl->busy)
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return -EBUSY;
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@ -451,6 +461,10 @@ static int stm32_qspi_setup(struct spi_device *spi)
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if (!spi->max_speed_hz)
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return -EINVAL;
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ret = pm_runtime_get_sync(qspi->dev);
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if (ret < 0)
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return ret;
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presc = DIV_ROUND_UP(qspi->clk_rate, spi->max_speed_hz) - 1;
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flash = &qspi->flash[spi->chip_select];
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@ -467,6 +481,9 @@ static int stm32_qspi_setup(struct spi_device *spi)
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writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
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mutex_unlock(&qspi->lock);
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pm_runtime_mark_last_busy(qspi->dev);
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pm_runtime_put_autosuspend(qspi->dev);
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return 0;
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}
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@ -643,8 +660,19 @@ static int stm32_qspi_probe(struct platform_device *pdev)
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ctrl->num_chipselect = STM32_QSPI_MAX_NORCHIP;
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ctrl->dev.of_node = dev->of_node;
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pm_runtime_set_autosuspend_delay(dev, STM32_AUTOSUSPEND_DELAY);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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pm_runtime_get_noresume(dev);
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ret = devm_spi_register_master(dev, ctrl);
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if (!ret)
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if (ret)
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goto err_qspi_release;
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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return 0;
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err_qspi_release:
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@ -660,14 +688,28 @@ static int stm32_qspi_remove(struct platform_device *pdev)
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struct stm32_qspi *qspi = platform_get_drvdata(pdev);
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stm32_qspi_release(qspi);
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return 0;
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}
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static int __maybe_unused stm32_qspi_suspend(struct device *dev)
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static int __maybe_unused stm32_qspi_runtime_suspend(struct device *dev)
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{
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struct stm32_qspi *qspi = dev_get_drvdata(dev);
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clk_disable_unprepare(qspi->clk);
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return 0;
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}
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static int __maybe_unused stm32_qspi_runtime_resume(struct device *dev)
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{
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struct stm32_qspi *qspi = dev_get_drvdata(dev);
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return clk_prepare_enable(qspi->clk);
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}
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static int __maybe_unused stm32_qspi_suspend(struct device *dev)
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{
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pinctrl_pm_select_sleep_state(dev);
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return 0;
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@ -683,10 +725,17 @@ static int __maybe_unused stm32_qspi_resume(struct device *dev)
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writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
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writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
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pm_runtime_mark_last_busy(qspi->dev);
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pm_runtime_put_autosuspend(qspi->dev);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(stm32_qspi_pm_ops, stm32_qspi_suspend, stm32_qspi_resume);
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static const struct dev_pm_ops stm32_qspi_pm_ops = {
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SET_RUNTIME_PM_OPS(stm32_qspi_runtime_suspend,
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stm32_qspi_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(stm32_qspi_suspend, stm32_qspi_resume)
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};
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static const struct of_device_id stm32_qspi_match[] = {
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{.compatible = "st,stm32f469-qspi"},
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