On Sun, Oct 5, 2008 at 1:49 AM, Tejun Heo <tj@xxxxxxxxxx> wrote: > Hello, > > Please verify whether the attached patch fixes all hardreset / probing > related issues. The patch is on top of v2.6.27-rc8. Sorry about all > the mess but it was quite a confusing problem. Here's what went down. > > * During 2.6.27-rcX, libata switched to prefer hardreset. > > * Which broke, generic flavor of sata_nv. Some sata_nv's fail to > bring the link up after hardreset. > > * A fix patch went in to disable hardreset for generic flavor. But it > accidentaly disabled hardreset for all flavors. > > * Which broke nf2/3 and CK804, because their hotplug interrupt bits > never get cleared. They're apparently cleared by hardreset > sequence. > > * Another fix patch went in to reinstate nv_hardreset for nf2/3 and > CK804. > > * Which broke nf2/3, which was because nf2/3's hardreset was broken in > different way. > > So, to sum up, each generation of sata_nv controllers exhibits > different hardreset behaviors. > > * generic: doesn't work. > > * nf2/3: signature D2H Reg FIS delivery doesn't work. > > * ck804: works. > > So, all three require different treatments to prefer hardreset and any > solution which didn't do that was broken. The attached patch should > solve all the problems. > > It was messy but this at least fixes hardreset for all flavors of nv > controllers, so it will generally improve reliability. > > Thanks. > > -- > tejun > OK, patching the 2.6.26 based on your patch doesn't work properly. It works for sata devices but not sata emulated devices (but these do work with the 2.6.27). -- 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
