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Subject[PATCH V2 3/8] spi: lpspi: enable runtime pm for lpspi
Date
From: Han Xu <han.xu@nxp.com>

Enable the runtime power management for lpspi module.

Do some adaptation work from kernel 4.9 to 4.14.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Han Xu <han.xu@nxp.com>
Reviewed-by: Frank Li <frank.li@nxp.com>
---
V2:
- Fix the comment format.
---
drivers/spi/spi-fsl-lpspi.c | 117 ++++++++++++++++++++++++++++--------
1 file changed, 92 insertions(+), 25 deletions(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index f363c000d24a..84dcb9e176b8 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -16,7 +16,9 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
@@ -24,6 +26,8 @@

#define DRIVER_NAME "fsl_lpspi"

+#define FSL_LPSPI_RPM_TIMEOUT 50 /* 50ms */
+
/* i.MX7ULP LPSPI registers */
#define IMX7ULP_VERID 0x0
#define IMX7ULP_PARAM 0x4
@@ -154,13 +158,9 @@ static int lpspi_prepare_xfer_hardware(struct spi_controller *controller)
spi_controller_get_devdata(controller);
int ret;

- ret = clk_prepare_enable(fsl_lpspi->clk_ipg);
- if (ret)
- return ret;
-
- ret = clk_prepare_enable(fsl_lpspi->clk_per);
- if (ret) {
- clk_disable_unprepare(fsl_lpspi->clk_ipg);
+ ret = pm_runtime_get_sync(fsl_lpspi->dev);
+ if (ret < 0) {
+ dev_err(fsl_lpspi->dev, "failed to enable clock\n");
return ret;
}

@@ -172,8 +172,8 @@ static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller)
struct fsl_lpspi_data *fsl_lpspi =
spi_controller_get_devdata(controller);

- clk_disable_unprepare(fsl_lpspi->clk_ipg);
- clk_disable_unprepare(fsl_lpspi->clk_per);
+ pm_runtime_mark_last_busy(fsl_lpspi->dev);
+ pm_runtime_put_autosuspend(fsl_lpspi->dev);

return 0;
}
@@ -480,6 +480,45 @@ static irqreturn_t fsl_lpspi_isr(int irq, void *dev_id)
return IRQ_NONE;
}

+int fsl_lpspi_runtime_resume(struct device *dev)
+{
+ struct fsl_lpspi_data *fsl_lpspi = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(fsl_lpspi->clk_per);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(fsl_lpspi->clk_ipg);
+ if (ret) {
+ clk_disable_unprepare(fsl_lpspi->clk_per);
+ return ret;
+ }
+
+ return 0;
+}
+
+int fsl_lpspi_runtime_suspend(struct device *dev)
+{
+ struct fsl_lpspi_data *fsl_lpspi = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(fsl_lpspi->clk_per);
+ clk_disable_unprepare(fsl_lpspi->clk_ipg);
+
+ return 0;
+}
+
+static int fsl_lpspi_init_rpm(struct fsl_lpspi_data *fsl_lpspi)
+{
+ struct device *dev = fsl_lpspi->dev;
+
+ pm_runtime_enable(dev);
+ pm_runtime_set_autosuspend_delay(dev, FSL_LPSPI_RPM_TIMEOUT);
+ pm_runtime_use_autosuspend(dev);
+
+ return 0;
+}
+
static int fsl_lpspi_probe(struct platform_device *pdev)
{
struct fsl_lpspi_data *fsl_lpspi;
@@ -505,6 +544,7 @@ static int fsl_lpspi_probe(struct platform_device *pdev)

fsl_lpspi = spi_controller_get_devdata(controller);
fsl_lpspi->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, fsl_lpspi);
fsl_lpspi->is_slave = of_property_read_bool((&pdev->dev)->of_node,
"spi-slave");

@@ -551,28 +591,21 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
goto out_controller_put;
}

- ret = clk_prepare_enable(fsl_lpspi->clk_ipg);
- if (ret) {
- dev_err(&pdev->dev,
- "can't enable lpspi ipg clock, ret=%d\n", ret);
+ /* enable the clock */
+ ret = fsl_lpspi_init_rpm(fsl_lpspi);
+ if (ret)
goto out_controller_put;
- }

- ret = clk_prepare_enable(fsl_lpspi->clk_per);
- if (ret) {
- dev_err(&pdev->dev,
- "can't enable lpspi per clock, ret=%d\n", ret);
- clk_disable_unprepare(fsl_lpspi->clk_ipg);
- goto out_controller_put;
+ ret = pm_runtime_get_sync(fsl_lpspi->dev);
+ if (ret < 0) {
+ dev_err(fsl_lpspi->dev, "failed to enable clock\n");
+ return ret;
}

temp = readl(fsl_lpspi->base + IMX7ULP_PARAM);
fsl_lpspi->txfifosize = 1 << (temp & 0x0f);
fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f);

- clk_disable_unprepare(fsl_lpspi->clk_per);
- clk_disable_unprepare(fsl_lpspi->clk_ipg);
-
ret = devm_spi_register_controller(&pdev->dev, controller);
if (ret < 0) {
dev_err(&pdev->dev, "spi_register_controller error.\n");
@@ -593,16 +626,50 @@ static int fsl_lpspi_remove(struct platform_device *pdev)
struct fsl_lpspi_data *fsl_lpspi =
spi_controller_get_devdata(controller);

- clk_disable_unprepare(fsl_lpspi->clk_per);
- clk_disable_unprepare(fsl_lpspi->clk_ipg);
+ pm_runtime_disable(fsl_lpspi->dev);
+
+ spi_master_put(controller);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int fsl_lpspi_suspend(struct device *dev)
+{
+ int ret;
+
+ pinctrl_pm_select_sleep_state(dev);
+ ret = pm_runtime_force_suspend(dev);
+ return ret;
+}
+
+static int fsl_lpspi_resume(struct device *dev)
+{
+ int ret;
+
+ ret = pm_runtime_force_resume(dev);
+ if (ret) {
+ dev_err(dev, "Error in resume: %d\n", ret);
+ return ret;
+ }
+
+ pinctrl_pm_select_default_state(dev);

return 0;
}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops fsl_lpspi_pm_ops = {
+ SET_RUNTIME_PM_OPS(fsl_lpspi_runtime_suspend,
+ fsl_lpspi_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(fsl_lpspi_suspend, fsl_lpspi_resume)
+};

static struct platform_driver fsl_lpspi_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = fsl_lpspi_dt_ids,
+ .pm = &fsl_lpspi_pm_ops,
},
.probe = fsl_lpspi_probe,
.remove = fsl_lpspi_remove,
--
2.17.1
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