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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>
steinar/wifi_calib_4_9_kernel
Heiner Kallweit 2015-08-26 21:21:55 +02:00 committed by Mark Brown
parent 3c5395b66f
commit e9abb4db8d
1 changed files with 54 additions and 17 deletions
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71
drivers/spi/spi-fsl-espi.c
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@ -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);