Hi Stern,
Thanks your kind support,but how to turn off media-change polling? or
may I change the polling time for long time to fixed this bug?
If media-change polling prevent the device entering runtime suspend,
Why connect USB storage devices and usb mouse also may cause USB bus
can't enter runtime suspend?
在 2014年11月24日 01:00, Alan Stern 写道:
On Sun, 23 Nov 2014, liu chunlin wrote:
Hi all,
AS I known,SDcard use SDIO interface,I need use a sdcard-reader(
USB to SDIO)if I want to use sdcard on my board ,but I have try
many sdcard-reader without sdcard to connect usb ,all of them will
cause usb bus can't enter runtime suspend. and I try to connect a
usb storage on my demo board also will cause usb bus can't enter
runtime suspend,but if I press power button,the usb bus can enter
suspend mode.I guess the driver hav not implemented this function.
Alan Stern tell me that Runtime suspend for USB storage devices
was added in the 3.14 kernel,but I can't find the patches about
USB runtime.Who can help me?
I was wrong; the support was added in the 3.10 kernel by these
commits:
66311274691e
6c9546675864
c8158819d506
9b21493c4520
6df339a51e3b
with bug fixes in these commits:
d20ec597cba1
c60855cdb976
10c580e4239d
In order to make runtime suspend work, you have to turn off
media-change polling. When there's no card in the reader, the system
will constantly check to see if a card has been inserted. This
checking will prevent the device from entering runtime suspend.
Alan Stern
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