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authorPatrice Chotard <patrice.chotard@st.com>2020-04-17 14:12:41 +0200
committerMark Brown <broonie@kernel.org>2020-04-17 14:21:00 +0100
commit9d282c17b023a97516a63255ce7f7ee65c39bec1 (patch)
tree7b15947fda91acb0c7a11e28e7dc6da41f8a2789 /drivers/spi/spi-stm32-qspi.c
parent5ba8e3e75361c68c1120080d7ffe8839bf11c06d (diff)
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>
Diffstat (limited to 'drivers/spi/spi-stm32-qspi.c')
-rw-r--r--drivers/spi/spi-stm32-qspi.c57
1 files changed, 53 insertions, 4 deletions
diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index d066f5144c3e..2f2ea2c42d6e 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sizes.h>
@@ -87,6 +88,7 @@
#define STM32_BUSY_TIMEOUT_US 100000
#define STM32_ABT_TIMEOUT_US 100000
#define STM32_COMP_TIMEOUT_MS 1000
+#define STM32_AUTOSUSPEND_DELAY -1
struct stm32_qspi_flash {
struct stm32_qspi *qspi;
@@ -431,10 +433,17 @@ static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
int ret;
+ ret = pm_runtime_get_sync(qspi->dev);
+ if (ret < 0)
+ return ret;
+
mutex_lock(&qspi->lock);
ret = stm32_qspi_send(mem, op);
mutex_unlock(&qspi->lock);
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
return ret;
}
@@ -444,6 +453,7 @@ static int stm32_qspi_setup(struct spi_device *spi)
struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl);
struct stm32_qspi_flash *flash;
u32 presc;
+ int ret;
if (ctrl->busy)
return -EBUSY;
@@ -451,6 +461,10 @@ static int stm32_qspi_setup(struct spi_device *spi)
if (!spi->max_speed_hz)
return -EINVAL;
+ ret = pm_runtime_get_sync(qspi->dev);
+ if (ret < 0)
+ return ret;
+
presc = DIV_ROUND_UP(qspi->clk_rate, spi->max_speed_hz) - 1;
flash = &qspi->flash[spi->chip_select];
@@ -467,6 +481,9 @@ static int stm32_qspi_setup(struct spi_device *spi)
writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
mutex_unlock(&qspi->lock);
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
return 0;
}
@@ -643,9 +660,20 @@ static int stm32_qspi_probe(struct platform_device *pdev)
ctrl->num_chipselect = STM32_QSPI_MAX_NORCHIP;
ctrl->dev.of_node = dev->of_node;
+ pm_runtime_set_autosuspend_delay(dev, STM32_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_runtime_get_noresume(dev);
+
ret = devm_spi_register_master(dev, ctrl);
- if (!ret)
- return 0;
+ if (ret)
+ goto err_qspi_release;
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
+ return 0;
err_qspi_release:
stm32_qspi_release(qspi);
@@ -660,14 +688,28 @@ static int stm32_qspi_remove(struct platform_device *pdev)
struct stm32_qspi *qspi = platform_get_drvdata(pdev);
stm32_qspi_release(qspi);
+
return 0;
}
-static int __maybe_unused stm32_qspi_suspend(struct device *dev)
+static int __maybe_unused stm32_qspi_runtime_suspend(struct device *dev)
{
struct stm32_qspi *qspi = dev_get_drvdata(dev);
clk_disable_unprepare(qspi->clk);
+
+ return 0;
+}
+
+static int __maybe_unused stm32_qspi_runtime_resume(struct device *dev)
+{
+ struct stm32_qspi *qspi = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(qspi->clk);
+}
+
+static int __maybe_unused stm32_qspi_suspend(struct device *dev)
+{
pinctrl_pm_select_sleep_state(dev);
return 0;
@@ -683,10 +725,17 @@ static int __maybe_unused stm32_qspi_resume(struct device *dev)
writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
return 0;
}
-static SIMPLE_DEV_PM_OPS(stm32_qspi_pm_ops, stm32_qspi_suspend, stm32_qspi_resume);
+static const struct dev_pm_ops stm32_qspi_pm_ops = {
+ SET_RUNTIME_PM_OPS(stm32_qspi_runtime_suspend,
+ stm32_qspi_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(stm32_qspi_suspend, stm32_qspi_resume)
+};
static const struct of_device_id stm32_qspi_match[] = {
{.compatible = "st,stm32f469-qspi"},