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i2c: sh_mobile: Mark adapter suspended during suspend

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When a driver tries to send an I2C message while the adapter is
suspended, this typically fails with:

    i2c-sh_mobile e60b0000.i2c: Transfer request timed out

Avoid accessing the adapter while it is suspended by marking it
suspended during suspend.  This allows the I2C core to catch this, and
print a warning:

    WARNING: CPU: 1 PID: 13 at drivers/i2c/i2c-core.h:54
__i2c_transfer+0x4a4/0x4e4
    i2c i2c-6: Transfer while suspended

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2020-10-13 16:12:01 +02:00 committed by Wolfram Sang
parent 04fd6f0a9e
commit e8a61e5a7e
1 changed files with 28 additions and 0 deletions
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28
drivers/i2c/busses/i2c-sh_mobile.c
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@ -956,10 +956,38 @@ static int sh_mobile_i2c_remove(struct platform_device *dev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int sh_mobile_i2c_suspend(struct device *dev)
{
struct sh_mobile_i2c_data *pd = dev_get_drvdata(dev);
i2c_mark_adapter_suspended(&pd->adap);
return 0;
}
static int sh_mobile_i2c_resume(struct device *dev)
{
struct sh_mobile_i2c_data *pd = dev_get_drvdata(dev);
i2c_mark_adapter_resumed(&pd->adap);
return 0;
}
static const struct dev_pm_ops sh_mobile_i2c_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sh_mobile_i2c_suspend,
sh_mobile_i2c_resume)
};
#define DEV_PM_OPS (&sh_mobile_i2c_pm_ops)
#else
#define DEV_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static struct platform_driver sh_mobile_i2c_driver = {
.driver = {
.name = "i2c-sh_mobile",
.of_match_table = sh_mobile_i2c_dt_ids,
.pm = DEV_PM_OPS,
},
.probe = sh_mobile_i2c_probe,
.remove = sh_mobile_i2c_remove,