Thanks and Best Regards Jerry Huang > -----Original Message----- > From: Tejun Heo [mailto:htejun@xxxxxxxxx] On Behalf Of Tejun Heo > Sent: Thursday, November 10, 2011 11:21 PM > To: Huang Changming-R66093 > Cc: linux-ide@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] libata-pmp: add schedule timeout to support some > PMP cards > > Hello, > > On Thu, Nov 10, 2011 at 08:07:47AM +0000, Huang Changming-R66093 wrote: > > > Ummm... We can't really issue commands after failure without going > > > through recovery. For ahci, it probably works. For other > > > controllers, it may not. Where does this delay come from? Is > there > > > any other way to wait for device readiness? > > > > > It is very bad. I have two PMP cards, one (5 ports) can work well > > without the delay time before reading PMP SCR, but the other (15 > > ports) must delay enough time before reading the PMP SCR. It seems > > there is no other way to detect the device readiness. > > > > Maybe I will just delay some time before send SCR command, if it > > failed, then we will report this error to driver? > > Hmmm... I'm curious what's causing the problem. Which port multiplier > are we talking about? If it's specific to that PMP, we can add quirk > to support it. Does the problem also happen when the PMP is connected > to a different controller? > Hi, The PMP card we are talking about is JMB393: Port Multiplier 1.2, 0x197b:0x0325 r0, 15 ports, feat 0x5/0xf. This issue is observed on Freescale's Sata controller, including p1020e and mpc837xe. -- 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
