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spi: spi-mtk-nor: Add power management support 

This patch adds dev_pm_ops to mtk-nor to support suspend/resume,
auto suspend delay is set to -1 by default.

Accessing registers are only permitted after its clock is enabled
to deal with unknown state of operating clk at probe time.

Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
Link: https://lore.kernel.org/r/20201006155010.v5.4.I68983b582d949a91866163bab588ff3c2a0d0275@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ikjoon Jang 2020-10-06 15:54:05 +08:00 committed by Mark Brown
parent e836d4cf61
commit 3bfd9103c7
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 76 additions and 22 deletions
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98
drivers/spi/spi-mtk-nor.c
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@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
#include <linux/string.h>
@ -690,22 +691,15 @@ static int mtk_nor_enable_clk(struct mtk_nor *sp)
return 0;
}
static int mtk_nor_init(struct mtk_nor *sp)
static void mtk_nor_init(struct mtk_nor *sp)
{
int ret;
ret = mtk_nor_enable_clk(sp);
if (ret)
return ret;
sp->spi_freq = clk_get_rate(sp->spi_clk);
writel(0, sp->base + MTK_NOR_REG_IRQ_EN);
writel(MTK_NOR_IRQ_MASK, sp->base + MTK_NOR_REG_IRQ_STAT);
writel(MTK_NOR_ENABLE_SF_CMD, sp->base + MTK_NOR_REG_WP);
mtk_nor_rmw(sp, MTK_NOR_REG_CFG2, MTK_NOR_WR_CUSTOM_OP_EN, 0);
mtk_nor_rmw(sp, MTK_NOR_REG_CFG3,
MTK_NOR_DISABLE_WREN | MTK_NOR_DISABLE_SR_POLL, 0);
return ret;
}
static irqreturn_t mtk_nor_irq_handler(int irq, void *data)
@ -788,6 +782,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
ctlr->num_chipselect = 1;
ctlr->setup = mtk_nor_setup;
ctlr->transfer_one_message = mtk_nor_transfer_one_message;
ctlr->auto_runtime_pm = true;
dev_set_drvdata(&pdev->dev, ctlr);
@ -811,12 +806,19 @@ static int mtk_nor_probe(struct platform_device *pdev)
return -ENOMEM;
}
ret = mtk_nor_enable_clk(sp);
if (ret < 0)
return ret;
sp->spi_freq = clk_get_rate(sp->spi_clk);
mtk_nor_init(sp);
irq = platform_get_irq_optional(pdev, 0);
if (irq < 0) {
dev_warn(sp->dev, "IRQ not available.");
} else {
writel(MTK_NOR_IRQ_MASK, base + MTK_NOR_REG_IRQ_STAT);
writel(0, base + MTK_NOR_REG_IRQ_EN);
ret = devm_request_irq(sp->dev, irq, mtk_nor_irq_handler, 0,
pdev->name, sp);
if (ret < 0) {
@ -827,34 +829,86 @@ static int mtk_nor_probe(struct platform_device *pdev)
}
}
ret = mtk_nor_init(sp);
if (ret < 0) {
kfree(ctlr);
return ret;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, -1);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
ret = devm_spi_register_controller(&pdev->dev, ctlr);
if (ret < 0)
goto err_probe;
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
dev_info(&pdev->dev, "spi frequency: %d Hz\n", sp->spi_freq);
return devm_spi_register_controller(&pdev->dev, ctlr);
return 0;
err_probe:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
mtk_nor_disable_clk(sp);
return ret;
}
static int mtk_nor_remove(struct platform_device *pdev)
{
struct spi_controller *ctlr;
struct mtk_nor *sp;
struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev);
struct mtk_nor *sp = spi_controller_get_devdata(ctlr);
ctlr = dev_get_drvdata(&pdev->dev);
sp = spi_controller_get_devdata(ctlr);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
mtk_nor_disable_clk(sp);
return 0;
}
static int __maybe_unused mtk_nor_runtime_suspend(struct device *dev)
{
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct mtk_nor *sp = spi_controller_get_devdata(ctlr);
mtk_nor_disable_clk(sp);
return 0;
}
static int __maybe_unused mtk_nor_runtime_resume(struct device *dev)
{
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct mtk_nor *sp = spi_controller_get_devdata(ctlr);
return mtk_nor_enable_clk(sp);
}
static int __maybe_unused mtk_nor_suspend(struct device *dev)
{
return pm_runtime_force_suspend(dev);
}
static int __maybe_unused mtk_nor_resume(struct device *dev)
{
return pm_runtime_force_resume(dev);
}
static const struct dev_pm_ops mtk_nor_pm_ops = {
SET_RUNTIME_PM_OPS(mtk_nor_runtime_suspend,
mtk_nor_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(mtk_nor_suspend, mtk_nor_resume)
};
static struct platform_driver mtk_nor_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = mtk_nor_match,
.pm = &mtk_nor_pm_ops,
},
.probe = mtk_nor_probe,
.remove = mtk_nor_remove,