leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

spi: lpspi: enable runtime pm for lpspi

Browse Source 
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>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Han Xu 2019-03-06 06:30:39 +00:00 committed by Mark Brown
parent addb32866d
commit 944c01a889
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 92 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

117
drivers/spi/spi-fsl-lpspi.c
View File

@ -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,