Hello, If an i2c driver uses dev_pm_ops and pm_runtime_suspended() returns true for the device, the i2c core will not call the driver's pm->suspend() routine. Similar behaviour (except for the if dev_pm_ops check) is present in the generic PM ops provided in drivers/base/power/generic_ops.c.
Since pm_runtime_suspended() returns true if the relevant driver did not call any pm_runtime functions, this means that any driver which does not use pm_runtime APIs will not get its pm->suspend() callback called during system sleep, if CONFIG_PM_RUNTIME is enabled. For the i2c case, there are several such drivers (in drivers/input/*, etc) lacking these calls. How is this to be handled? Do all of these drivers need to be patched to use the pm_runtime API if they are to be used on a kernel with PM_RUNTIME enabled? thanks, Rabin -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
