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authorHeiner Kallweit <hkallweit1@gmail.com>2015-08-26 19:21:55 (GMT)
committerMark Brown <broonie@kernel.org>2015-08-28 17:15:18 (GMT)
commite9abb4db8d108624c293f06dce06b2978e626a13 (patch)
tree04132b9da13d86f0df51dbb415cc0683d44850aa /drivers/spi/spi-fsl-espi.c
parent3c5395b66ff69d8d568d0b9ff8b1077e044def5b (diff)
downloadlinux-e9abb4db8d108624c293f06dce06b2978e626a13.tar.xz
spi: fsl-espi: add runtime PM
Add runtime PM and use autosuspend instead of suspending the SPI controller after each transfer. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-fsl-espi.c')
-rw-r--r--drivers/spi/spi-fsl-espi.c71
1 files changed, 54 insertions, 17 deletions
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index fe54e57..db82c87 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -21,6 +21,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
+#include <linux/pm_runtime.h>
#include <sysdev/fsl_soc.h>
#include "spi-fsl-lib.h"
@@ -85,6 +86,8 @@ struct fsl_espi_transfer {
#define SPCOM_TRANLEN(x) ((x) << 0)
#define SPCOM_TRANLEN_MAX 0xFFFF /* Max transaction length */
+#define AUTOSUSPEND_TIMEOUT 2000
+
static void fsl_espi_change_mode(struct spi_device *spi)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -485,6 +488,8 @@ static int fsl_espi_setup(struct spi_device *spi)
mpc8xxx_spi = spi_master_get_devdata(spi->master);
reg_base = mpc8xxx_spi->reg_base;
+ pm_runtime_get_sync(mpc8xxx_spi->dev);
+
hw_mode = cs->hw_mode; /* Save original settings */
cs->hw_mode = mpc8xxx_spi_read_reg(
&reg_base->csmode[spi->chip_select]);
@@ -507,6 +512,10 @@ static int fsl_espi_setup(struct spi_device *spi)
mpc8xxx_spi_write_reg(&reg_base->mode, loop_mode);
retval = fsl_espi_setup_transfer(spi, NULL);
+
+ pm_runtime_mark_last_busy(mpc8xxx_spi->dev);
+ pm_runtime_put_autosuspend(mpc8xxx_spi->dev);
+
if (retval < 0) {
cs->hw_mode = hw_mode; /* Restore settings */
return retval;
@@ -604,15 +613,14 @@ static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
return ret;
}
-static int fsl_espi_suspend(struct spi_master *master)
+#ifdef CONFIG_PM
+static int fsl_espi_runtime_suspend(struct device *dev)
{
- struct mpc8xxx_spi *mpc8xxx_spi;
- struct fsl_espi_reg *reg_base;
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
+ struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
u32 regval;
- mpc8xxx_spi = spi_master_get_devdata(master);
- reg_base = mpc8xxx_spi->reg_base;
-
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval &= ~SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
@@ -620,21 +628,20 @@ static int fsl_espi_suspend(struct spi_master *master)
return 0;
}
-static int fsl_espi_resume(struct spi_master *master)
+static int fsl_espi_runtime_resume(struct device *dev)
{
- struct mpc8xxx_spi *mpc8xxx_spi;
- struct fsl_espi_reg *reg_base;
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
+ struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
u32 regval;
- mpc8xxx_spi = spi_master_get_devdata(master);
- reg_base = mpc8xxx_spi->reg_base;
-
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval |= SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
return 0;
}
+#endif
static struct spi_master * fsl_espi_probe(struct device *dev,
struct resource *mem, unsigned int irq)
@@ -662,8 +669,7 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
master->setup = fsl_espi_setup;
master->cleanup = fsl_espi_cleanup;
master->transfer_one_message = fsl_espi_do_one_msg;
- master->prepare_transfer_hardware = fsl_espi_resume;
- master->unprepare_transfer_hardware = fsl_espi_suspend;
+ master->auto_runtime_pm = true;
mpc8xxx_spi = spi_master_get_devdata(master);
@@ -725,14 +731,27 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
+ pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
ret = devm_spi_register_master(dev, master);
if (ret < 0)
- goto err_probe;
+ goto err_pm;
dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
return master;
+err_pm:
+ pm_runtime_put_noidle(dev);
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
err_probe:
spi_master_put(master);
err:
@@ -797,6 +816,13 @@ err:
return ret;
}
+static int of_fsl_espi_remove(struct platform_device *dev)
+{
+ pm_runtime_disable(&dev->dev);
+
+ return 0;
+}
+
#ifdef CONFIG_PM_SLEEP
static int of_fsl_espi_suspend(struct device *dev)
{
@@ -809,7 +835,11 @@ static int of_fsl_espi_suspend(struct device *dev)
return ret;
}
- return fsl_espi_suspend(master);
+ ret = pm_runtime_force_suspend(dev);
+ if (ret < 0)
+ return ret;
+
+ return 0;
}
static int of_fsl_espi_resume(struct device *dev)
@@ -819,7 +849,7 @@ static int of_fsl_espi_resume(struct device *dev)
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
u32 regval;
- int i;
+ int i, ret;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
@@ -839,11 +869,17 @@ static int of_fsl_espi_resume(struct device *dev)
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
+ ret = pm_runtime_force_resume(dev);
+ if (ret < 0)
+ return ret;
+
return spi_master_resume(master);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops espi_pm = {
+ SET_RUNTIME_PM_OPS(fsl_espi_runtime_suspend,
+ fsl_espi_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume)
};
@@ -860,6 +896,7 @@ static struct platform_driver fsl_espi_driver = {
.pm = &espi_pm,
},
.probe = of_fsl_espi_probe,
+ .remove = of_fsl_espi_remove,
};
module_platform_driver(fsl_espi_driver);