renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-12 07:14:03 +08:00
Code

i2c: sprd: Prevent i2c accesses after suspend is called

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/i2c/busses/i2c-sprd.c
View File

@ -86,6 +86,7 @@ struct sprd_i2c {
u32 count;
int irq;
int err;
bool is_suspended;
};
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;
int im, ret;
if (i2c_dev->is_suspended)
return -EBUSY;
ret = pm_runtime_get_sync(i2c_dev->dev);
if (ret < 0)
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)
{
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);
}
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);
}