On Thu, Dec 15, 2011 at 20:21, Tejun Heo <tj@xxxxxxxxxx> wrote: > On Thu, Dec 15, 2011 at 09:12:49PM +0800, Lin Ming wrote: >> I use eSATA to test disk hot plug. >> With previous 3 patches applied, disk hot plug does not wok >> when ahci port/controller is runtime suspended. >> >> There are 2 cases we need to handle for hot plug: >> >> 1. port suspended, controller active >> Is IRQ need to be enabled for port to detect hot plug? >> >> 2. port suspended, controller suspended >> Will controller get a PME when hot plug happens? >> >> I'm still investigating hot plug support. >> >> Anyone has comment? > > SATA link detection requires hot wire and keeping wire hot takes > power. Oh, hardware in general just sucks. :) > I think it's fair tradeoff to not support hotplug while > powersaving is on. We have warm plug mechanism (the SCSI rescan > trigger via sysfs) after all. It would be nice if things like that is > somehow exported to userland in easy way tho (cc'ing Kay), but I > frankly don't have much idea where that would fit. Getting David in the loop. He might have an idea. Kay -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
