Unverified Commit 944c01a8 authored by Han Xu's avatar Han Xu Committed by Mark Brown
Browse files

spi: lpspi: enable runtime pm for lpspi 



Enable the runtime power management for lpspi module.

Do some adaptation work from kernel 4.9 to 4.14.

Signed-off-by: default avatarClark Wang <xiaoning.wang@nxp.com>
Signed-off-by: default avatarHan Xu <han.xu@nxp.com>
Reviewed-by: default avatarFrank Li <frank.li@nxp.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent addb3286

drivers/spi/spi-fsl-lpspi.c

+92 −25
Original line number Diff line number Diff line
@@ -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,

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