Subject: Can you please test the attached patch for nv hardreset problem?
Date: Sunday 5th October 2008 00:49:21 UTC (over 8 years ago)
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