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i2c: sprd: Prevent i2c accesses after suspend is called

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Add one flag to indicate if the i2c controller has been in suspend state,
which can prevent i2c accesses after i2c controller is suspended following
system suspend.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Baolin Wang 2018-04-09 14:40:54 +08:00 committed by Wolfram Sang
parent 23a27722b5
commit da33aa03fa
1 changed files with 16 additions and 0 deletions
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16
drivers/i2c/busses/i2c-sprd.c
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@ -86,6 +86,7 @@ struct sprd_i2c {
u32 count; u32 count;
int irq; int irq;
int err; int err;
bool is_suspended;
}; };
static void sprd_i2c_set_count(struct sprd_i2c *i2c_dev, u32 count) static void sprd_i2c_set_count(struct sprd_i2c *i2c_dev, u32 count)
@ -283,6 +284,9 @@ static int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
struct sprd_i2c *i2c_dev = i2c_adap->algo_data; struct sprd_i2c *i2c_dev = i2c_adap->algo_data;
int im, ret; int im, ret;
if (i2c_dev->is_suspended)
return -EBUSY;
ret = pm_runtime_get_sync(i2c_dev->dev); ret = pm_runtime_get_sync(i2c_dev->dev);
if (ret < 0) if (ret < 0)
return ret; return ret;
@ -586,11 +590,23 @@ static int sprd_i2c_remove(struct platform_device *pdev)
static int __maybe_unused sprd_i2c_suspend_noirq(struct device *pdev) static int __maybe_unused sprd_i2c_suspend_noirq(struct device *pdev)
{ {
struct sprd_i2c *i2c_dev = dev_get_drvdata(pdev);
i2c_lock_adapter(&i2c_dev->adap);
i2c_dev->is_suspended = true;
i2c_unlock_adapter(&i2c_dev->adap);
return pm_runtime_force_suspend(pdev); return pm_runtime_force_suspend(pdev);
} }
static int __maybe_unused sprd_i2c_resume_noirq(struct device *pdev) static int __maybe_unused sprd_i2c_resume_noirq(struct device *pdev)
{ {
struct sprd_i2c *i2c_dev = dev_get_drvdata(pdev);
i2c_lock_adapter(&i2c_dev->adap);
i2c_dev->is_suspended = false;
i2c_unlock_adapter(&i2c_dev->adap);
return pm_runtime_force_resume(pdev); return pm_runtime_force_resume(pdev);
} }