| Message ID | 20201013141201.28338-1-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | i2c: sh_mobile: Mark adapter suspended during suspend | expand |
On Tue, Oct 13, 2020 at 04:12:01PM +0200, Geert Uytterhoeven wrote: > 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> Applied to for-next, thanks!
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index bdd60770779ad523..3ae6ca21a02c6b9f 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -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,
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> --- This follows the same approach as commit 18569fa89a4db9ed ("i2c: rcar: add suspend/resume support"). Exposed by commit dc279ac6e5b4e06e ("cpufreq: dt: Refactor initialization to handle probe deferral properly") in linux-next, which tries to talk to the PMIC on r8a7791/koelsch while the I2C controller is suspended. --- drivers/i2c/busses/i2c-sh_mobile.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)