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spi: atmel-quadspi: add runtime pm support

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Add runtime PM support for atmel-quadspi which will disable/enable
QSPI clocks on proper runtime_suspend/runtime_resume ops.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220609084246.1795419-2-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Claudiu Beznea 2022-06-09 11:42:44 +03:00 committed by Mark Brown
parent 5dfac65b62
commit 4a2f83b7f7
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 91 additions and 9 deletions
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100
drivers/spi/atmel-quadspi.c
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@ -21,6 +21,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi-mem.h>
/* QSPI register offsets */
@ -417,9 +418,13 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
if (op->addr.val + op->data.nbytes > aq->mmap_size)
return -ENOTSUPP;
err = pm_runtime_resume_and_get(&aq->pdev->dev);
if (err < 0)
return err;
err = atmel_qspi_set_cfg(aq, op, &offset);
if (err)
return err;
goto pm_runtime_put;
/* Skip to the final steps if there is no data */
if (op->data.nbytes) {
@ -441,7 +446,7 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
/* Poll INSTRuction End status */
sr = atmel_qspi_read(aq, QSPI_SR);
if ((sr & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED)
return err;
goto pm_runtime_put;
/* Wait for INSTRuction End interrupt */
reinit_completion(&aq->cmd_completion);
@ -452,6 +457,9 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
err = -ETIMEDOUT;
atmel_qspi_write(QSPI_SR_CMD_COMPLETED, aq, QSPI_IDR);
pm_runtime_put:
pm_runtime_mark_last_busy(&aq->pdev->dev);
pm_runtime_put_autosuspend(&aq->pdev->dev);
return err;
}
@ -472,6 +480,7 @@ static int atmel_qspi_setup(struct spi_device *spi)
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
unsigned long src_rate;
u32 scbr;
int ret;
if (ctrl->busy)
return -EBUSY;
@ -488,9 +497,16 @@ static int atmel_qspi_setup(struct spi_device *spi)
if (scbr > 0)
scbr--;
ret = pm_runtime_resume_and_get(ctrl->dev.parent);
if (ret < 0)
return ret;
aq->scr = QSPI_SCR_SCBR(scbr);
atmel_qspi_write(aq->scr, aq, QSPI_SCR);
pm_runtime_mark_last_busy(ctrl->dev.parent);
pm_runtime_put_autosuspend(ctrl->dev.parent);
return 0;
}
@ -621,11 +637,24 @@ static int atmel_qspi_probe(struct platform_device *pdev)
if (err)
goto disable_qspick;
pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
atmel_qspi_init(aq);
err = spi_register_controller(ctrl);
if (err)
if (err) {
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
goto disable_qspick;
}
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
@ -641,9 +670,18 @@ static int atmel_qspi_remove(struct platform_device *pdev)
{
struct spi_controller *ctrl = platform_get_drvdata(pdev);
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
int ret;
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0)
return ret;
spi_unregister_controller(ctrl);
atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
clk_disable_unprepare(aq->qspick);
clk_disable_unprepare(aq->pclk);
return 0;
@ -653,10 +691,19 @@ static int __maybe_unused atmel_qspi_suspend(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
int ret;
ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
clk_disable_unprepare(aq->qspick);
clk_disable_unprepare(aq->pclk);
pm_runtime_mark_last_busy(dev);
pm_runtime_force_suspend(dev);
clk_unprepare(aq->qspick);
clk_unprepare(aq->pclk);
return 0;
}
@ -665,19 +712,54 @@ static int __maybe_unused atmel_qspi_resume(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
int ret;
clk_prepare_enable(aq->pclk);
clk_prepare_enable(aq->qspick);
clk_prepare(aq->pclk);
clk_prepare(aq->qspick);
ret = pm_runtime_force_resume(dev);
if (ret < 0)
return ret;
atmel_qspi_init(aq);
atmel_qspi_write(aq->scr, aq, QSPI_SCR);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0;
}
static SIMPLE_DEV_PM_OPS(atmel_qspi_pm_ops, atmel_qspi_suspend,
atmel_qspi_resume);
static int __maybe_unused atmel_qspi_runtime_suspend(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
clk_disable(aq->qspick);
clk_disable(aq->pclk);
return 0;
}
static int __maybe_unused atmel_qspi_runtime_resume(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
int ret;
ret = clk_enable(aq->pclk);
if (ret)
return ret;
return clk_enable(aq->qspick);
}
static const struct dev_pm_ops __maybe_unused atmel_qspi_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(atmel_qspi_suspend, atmel_qspi_resume)
SET_RUNTIME_PM_OPS(atmel_qspi_runtime_suspend,
atmel_qspi_runtime_resume, NULL)
};
static const struct atmel_qspi_caps atmel_sama5d2_qspi_caps = {};