Hi Wolfram, What do you think about this patch? Thanks, Zhonghui On 12/24/2015 10:44 PM, Fu, Zhonghui wrote: > Now, PM core supports asynchronous suspend/resume mode for devices > during system suspend/resume, and the power state transition of one > device may be completed in separate kernel thread. PM core ensures > all power state transition dependency between devices. This patch > enables i2c adapters to suspend/resume asynchronously. This will take > advantage of multicore and improve system suspend/resume speed. After > enabling all i2c devices, i2c adapters and i2c controllers on ASUS > T100TA tablet, the system suspend-to-idle time is reduced to about > 510ms from 750ms, and the system resume time is reduced to about 790ms > from 900ms. > > Signed-off-by: Zhonghui Fu <zhonghui.fu@xxxxxxxxxxxxxxx> > --- > drivers/i2c/i2c-core.c | 2 ++ > 1 files changed, 2 insertions(+), 0 deletions(-) > > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c > index ba8eb08..72d5466 100644 > --- a/drivers/i2c/i2c-core.c > +++ b/drivers/i2c/i2c-core.c > @@ -1564,6 +1564,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap) > > pm_runtime_no_callbacks(&adap->dev); > > + device_enable_async_suspend(&adap->dev); > + > #ifdef CONFIG_I2C_COMPAT > res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev, > adap->dev.parent); > -- 1.7.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
