On Fri, 02 Dec 2011 15:10:08 -0800 Yinghai Lu <yinghai.lu@xxxxxxxxxx> wrote: > > One system have repeater in system board to support gen2 hotplug. > > Found when EM is removed from some slots, /var/log/message will be full of > "card present/not present" warning. > > It turns out root complex still try to train the link to repeater because > repeater is not reset. > > This patch will disable link to make repeater could reset properly. > Also could kill AER during EM removal. > > Recently when testing hotplug on one system under development, found if boot > the system without EM, and later hotplug does not work with Linux. > But other OS is ok. > The root cause is that bios left link disabled when slot is empty, > and other OS is playing link disable bit in link ctrl during power on/off. > > So We could do the same thing to disable/enable link during power off/on. > > Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxxxxx> > Kenji-san, any comment or chance to test? Thanks, -- Jesse Barnes, Intel Open Source Technology Center
Attachment:
signature.asc
Description: PGP signature
