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> Ok I had to massage that commit message quite a bit, please let me know if it's still accurate. The 100ms delay still needs to be clarified; if it's really necessary maybe we could move the delays into a delayed work handler? -- Jesse Barnes, Intel Open Source Technology Center
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