ATAPI DVD writer wont operate in DMA mode

[Tom Evans]

On Fri, 2007-06-08 at 11:22 -0600, Scott Long wrote:
> Is this device attached via SATA or IDE?  If it's SATA, then no, the 
> driver doesn't support SATA-ATAPI + DMA.
> 
> Scott
> 
> 
> Tom Evans wrote:
> > Hi was hoping someone could help me get my DVD writer operating in DMA.
> > Trying to set the mode with atacontrol succeeds, but only sets the mode
> > to WDMA, which is hardly better than PIO.
> > 
> > I tried tracing through the DMA initialisation in sys/dev/ata/ata-pci.c,
> > but I got lost I'm afraid.
> > 
> > Here is pertinent information:
> > 
> > uname -a:
> >   FreeBSD zoot.mintel.co.uk 7.0-CURRENT FreeBSD 7.0-CURRENT #1: 
> >   Tue Jun  5 14:39:27 BST 2007 (sources synched ~5 hrs prior to this)
> >   root at zoot.mintel.co.uk:/usr/obj/usr/src/sys/ZOOT  i386
> > 
> > dvd device:
> >   acd0: DVDR <MATSHITADVD-RAM UJ-840S/1.11> at ata0-master
> > 
> > ata controller:
> >   atapci0 at pci0:31:1:      class=0x01018a card=0x30aa103c chip=0x27df8086
> > rev=0x01 hdr=0x00
> >   device     = '82801G (ICH7 Family) Ultra ATA Storage Controller'
> > 
> > dmesg.boot: attached (sorry, not verbose, can get verbose if reqd)
> > 
> > pciconf -lv: attached
> > 
> > sysctl hw.ata:
> >   hw.ata.wc: 1
> >   hw.ata.atapi_dma: 1
> >   hw.ata.ata_dma: 1
> >   (Set via /boot/loader.conf)
> > 
> > atacontrol cap acd0:
> > 
> >   Protocol              ATA/ATAPI revision 6
> >   device model          MATSHITADVD-RAM UJ-840S
> >   serial number         
> >   firmware revision     1.11
> >   cylinders             0
> >   heads                 0
> >   sectors/track         0
> >   lba supported         
> >   lba48 not supported       
> >   dma supported
> >   overlap not supported
> > 
> >   Feature                      Support  Enable    Value     Vendor
> >   write cache                    no       no
> >   read ahead                     no       no
> >   Tagged Command Queuing (TCQ)   no       no      0/0x00
> >   SMART                          no       no
> >   microcode download             no       no
> >   security                       no       no
> >   power management               no       no
> >   advanced power management      no       no      0/0x00
> >   automatic acoustic management  no       no      0/0x00  0/0x00
> > 
> > TIA
> > 
> > Tom
> > 
> 
It would appear not:

 $ dmesg | grep 'acd0\|ata0\|atapci0'
atapci0: <Intel ICH7 UDMA100 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x60a0-0x60af irq 16 at device 31.1
on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
acd0: DVDR <MATSHITADVD-RAM UJ-840S/1.11> at ata0-master PIO4
acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 
cd0 at ata0 bus 0 target 0 lun 0
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