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-rw-r--r--drivers/i2c/busses/i2c-cadence.c66
1 files changed, 45 insertions, 21 deletions
diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index 84deed6571bd..d54ad46afa2b 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
+#include <linux/pm_runtime.h>
/* Register offsets for the I2C device. */
#define CDNS_I2C_CR_OFFSET 0x00 /* Control Register, RW */
@@ -96,6 +97,8 @@
CDNS_I2C_IXR_COMP)
#define CDNS_I2C_TIMEOUT msecs_to_jiffies(1000)
+/* timeout for pm runtime autosuspend */
+#define CNDS_I2C_PM_TIMEOUT 1000 /* ms */
#define CDNS_I2C_FIFO_DEPTH 16
/* FIFO depth at which the DATA interrupt occurs */
@@ -141,6 +144,7 @@
* @quirks: flag for broken hold bit usage in r1p10
*/
struct cdns_i2c {
+ struct device *dev;
void __iomem *membase;
struct i2c_adapter adap;
struct i2c_msg *p_msg;
@@ -569,9 +573,14 @@ static int cdns_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
struct cdns_i2c *id = adap->algo_data;
bool hold_quirk;
+ ret = pm_runtime_get_sync(id->dev);
+ if (ret < 0)
+ return ret;
/* Check if the bus is free */
- if (cdns_i2c_readreg(CDNS_I2C_SR_OFFSET) & CDNS_I2C_SR_BA)
- return -EAGAIN;
+ if (cdns_i2c_readreg(CDNS_I2C_SR_OFFSET) & CDNS_I2C_SR_BA) {
+ ret = -EAGAIN;
+ goto out;
+ }
hold_quirk = !!(id->quirks & CDNS_I2C_BROKEN_HOLD_BIT);
/*
@@ -590,7 +599,8 @@ static int cdns_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
if (msgs[count].flags & I2C_M_RD) {
dev_warn(adap->dev.parent,
"Can't do repeated start after a receive message\n");
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
+ goto out;
}
}
id->bus_hold_flag = 1;
@@ -608,20 +618,26 @@ static int cdns_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
ret = cdns_i2c_process_msg(id, msgs, adap);
if (ret)
- return ret;
+ goto out;
/* Report the other error interrupts to application */
if (id->err_status) {
cdns_i2c_master_reset(adap);
- if (id->err_status & CDNS_I2C_IXR_NACK)
- return -ENXIO;
-
- return -EIO;
+ if (id->err_status & CDNS_I2C_IXR_NACK) {
+ ret = -ENXIO;
+ goto out;
+ }
+ ret = -EIO;
+ goto out;
}
}
- return num;
+ ret = num;
+out:
+ pm_runtime_mark_last_busy(id->dev);
+ pm_runtime_put_autosuspend(id->dev);
+ return ret;
}
/**
@@ -808,10 +824,9 @@ static int cdns_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long
*
* Return: 0 always
*/
-static int __maybe_unused cdns_i2c_suspend(struct device *_dev)
+static int __maybe_unused cdns_i2c_runtime_suspend(struct device *dev)
{
- struct platform_device *pdev = container_of(_dev,
- struct platform_device, dev);
+ struct platform_device *pdev = to_platform_device(dev);
struct cdns_i2c *xi2c = platform_get_drvdata(pdev);
clk_disable(xi2c->clk);
@@ -828,16 +843,15 @@ static int __maybe_unused cdns_i2c_suspend(struct device *_dev)
*
* Return: 0 on success and error value on error
*/
-static int __maybe_unused cdns_i2c_resume(struct device *_dev)
+static int __maybe_unused cdns_i2c_runtime_resume(struct device *dev)
{
- struct platform_device *pdev = container_of(_dev,
- struct platform_device, dev);
+ struct platform_device *pdev = to_platform_device(dev);
struct cdns_i2c *xi2c = platform_get_drvdata(pdev);
int ret;
ret = clk_enable(xi2c->clk);
if (ret) {
- dev_err(_dev, "Cannot enable clock.\n");
+ dev_err(dev, "Cannot enable clock.\n");
return ret;
}
@@ -846,8 +860,10 @@ static int __maybe_unused cdns_i2c_resume(struct device *_dev)
return 0;
}
-static SIMPLE_DEV_PM_OPS(cdns_i2c_dev_pm_ops, cdns_i2c_suspend,
- cdns_i2c_resume);
+static const struct dev_pm_ops cdns_i2c_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(cdns_i2c_runtime_suspend,
+ cdns_i2c_runtime_resume, NULL)
+};
static const struct cdns_platform_data r1p10_i2c_def = {
.quirks = CDNS_I2C_BROKEN_HOLD_BIT,
@@ -881,6 +897,7 @@ static int cdns_i2c_probe(struct platform_device *pdev)
if (!id)
return -ENOMEM;
+ id->dev = &pdev->dev;
platform_set_drvdata(pdev, id);
match = of_match_node(cdns_i2c_of_match, pdev->dev.of_node);
@@ -913,10 +930,14 @@ static int cdns_i2c_probe(struct platform_device *pdev)
return PTR_ERR(id->clk);
}
ret = clk_prepare_enable(id->clk);
- if (ret) {
+ if (ret)
dev_err(&pdev->dev, "Unable to enable clock.\n");
- return ret;
- }
+
+ pm_runtime_enable(id->dev);
+ pm_runtime_set_autosuspend_delay(id->dev, CNDS_I2C_PM_TIMEOUT);
+ pm_runtime_use_autosuspend(id->dev);
+ pm_runtime_set_active(id->dev);
+
id->clk_rate_change_nb.notifier_call = cdns_i2c_clk_notifier_cb;
if (clk_notifier_register(id->clk, &id->clk_rate_change_nb))
dev_warn(&pdev->dev, "Unable to register clock notifier.\n");
@@ -966,6 +987,8 @@ static int cdns_i2c_probe(struct platform_device *pdev)
err_clk_dis:
clk_disable_unprepare(id->clk);
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
return ret;
}
@@ -984,6 +1007,7 @@ static int cdns_i2c_remove(struct platform_device *pdev)
i2c_del_adapter(&id->adap);
clk_notifier_unregister(id->clk, &id->clk_rate_change_nb);
clk_disable_unprepare(id->clk);
+ pm_runtime_disable(&pdev->dev);
return 0;
}