Date: Wed, 25 Jan 2006 08:53:28 -0800 (PST)
From: "Randy.Dunlap" <rdunlap@xenotime.net>
To: Ed Sweetman <safemode@comcast.net>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org,
       akpm@osdl.org
Subject: Re: 2.6.16-rc1-mm2 pata driver confusion
Message-ID: <Pine.LNX.4.58.0601250846210.29859@shark.he.net>
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Sender: linux-kernel-owner@vger.kernel.org
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(sorry about breaking the threading)

On 1/24/06, Ed Sweetman <safemode@comcast.net> wrote:
> Randy.Dunlap wrote:
>
> >On Tue, 24 Jan 2006, Ed Sweetman wrote:
> >
> >
> >>Randy.Dunlap wrote:
> >>
> >>
> >>>On Tue, 24 Jan 2006, Ed Sweetman wrote:
> >>>
> >>>
> >>>>Alan Cox wrote:
> >>>>
> >>>>
> >>>>>On Maw, 2006-01-24 at 01:43 -0500, Ed Sweetman wrote:
> >>>>>
> >>>>>
> >>>>>>problem.  The problem is that there appears to be two nvidia/amd ata
> >>>>>>drivers and I'm unsure which I should try using, if i compile both in,
> >>>>>>which get loaded first (i assume scsi is second to ide) and if i want my
> >>>>>>pata disks loaded under the new libata drivers, will my cdrom work under
> >>>>>>them too, or do i still need some sort of regular ide drivers loaded
> >>>>>>just for cdrom (to use native ata mode for recording access).
> >>>>>>
> >>>>>>
> >>>>>The goal of the drivers/scsi/pata_* drivers is to replace drivers/ide in
> >>>>>its entirity with code using the newer and cleaner libata logic. There
> >>>>>is still much to do but my SIL680, SiS, Intel MPIIX, AMD and VIA boxes
> >>>>>are using libata and the additional patch patches still queued
> >>>>>
> >>>>>
> >>>>>>1.  Atapi is most definitely not supported by libata, right now.
> >>>>>>
> >>>>>>
> >>>>>It works in the -mm tree.
> >>>>>
> >>>>>
> >>>>Intriguing, when I had no ide chipset compiled in kernel, only libata
> >>>>drivers, I got no mention at all about my dvd writer.  I even had the
> >>>>scsi cd driver installed and generic devices, still nothing seemed to
> >>>>initialize the dvd drive.  It detected the second pata bus but no
> >>>>devices attached to it.
> >>>>
> >>>>this is using the kernel mentioned in the subject header.
> >>>>2.6.16-rc1-mm2.  using the amd/nvidia drivers for pata and sata.
> >>>>
> >>>>Is there anything i can do to give more info to the list to figure out
> >>>>why my atapi writer is being ignored by pata even when there are no ide
> >>>>drivers loaded?
> >>>>
> >>>>
> >>>Currently you need to use libata.atapi_enabled=1
> >>>(assuming that libata is in the kernel image, not a loadable module).
> >>>
> >>>I just built/tested this also, working for me as well.
> >>>(hard drives, not ATAPI)
> >>>
> >>>
> >>I assume libata.atapi_enabled=1 is a boot arg, not some structure member
> >>in the source for the pata driver that i need to set to 1, correct?
> >>
> >
> >Yes, it's a kernel boot option if libata is in the kernel image.
> >If libata is a loadable module, just use something like
> >       modprobe libata atapi_enabled=1
> >
> >
> >>And you just built and tested it, how did you test if the atapi argument
> >>worked when you then say "not ATAPI" as something you tested?
> >>
> >
> >Sorry, I mean that I built and booted a kernel with libata/PATA
> >hard drive (vs. legacy drivers/ide/ PATA support).  I have not
> >tested ATAPI at all and didn't mean to imply that I had.
> >
> >I reported on libata.atapi_enabled=1 based on documentation
> >and other emails that I have read.
> >
> >
> >>In any case, i'll try out libata.atapi_enabled=1 and see if it detects
> >>the dvd drive.
> >>
> >
> >HTH.  Please continue to post any questions or problems.
> >
>
> I Rebooted several times, both setting the option in the kernel boot
> args and editing the source to have it set by default.  No atapi devices
> are found/mentioned or even described as not found in dmesg/bootup.   So
> apparently, on my chipset, the amd/nvidia pata driver is not detecting
> atapi devices.
>
> 0000:00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
> 0000:00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA
> Controller (rev f3)
> 0000:00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA
> Controller (rev f3)
>
> 0000:00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
> (prog-if 8a [Master SecP PriP])
>         Subsystem: Unknown device f043:815a
>         Flags: bus master, 66MHz, fast devsel, latency 0
>         I/O ports at f000 [size=16]
>         Capabilities: [44] Power Management version 2
>
>
> the atapi device in question is a plextor px-712A, it's the only device
> on the secondary channel.

And this is with using only ATA (libata) drivers in drivers/scsi/
and not ATA drivers in drivers/ide/, right?

Hm.  I guess we treat this as a bug report for NV ATA/ATAPI then.

I just tested my system with a Plextor PX-712SA drive plus
booting with libata.atapi_enabled=1 and the driver (not nv)
sees the ATAPI drive and can read it.

-- 
~Randy
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