ide-cd problem in 2.6.12-rc5 + todays snapshot

[Meelis Roos <mroos@linux.ee>]

Background: I have a Sony CDU5211 CD drive with Intel D815EEA2 mainboard 
(ICH2 IDE in 815 chipset). Since 2.4.21 timeframe IDE DMA for this CD 
drive is broken (see my post 
http://www.ussg.iu.edu/hypermail/linux/kernel/0410.3/0480.html). This 
happens on at least 2 identical machines. This is the first problem 
(that I have learned to live with).

Now, since ide-cd dma is broken, the first access to cd always gets DMA 
timeout and turns off DMA, then it works. I have hddtemp installed and 
it probes for drives on boot. In 2.6.12 (and I think I tested pristine 
2.6.12-rc5 too) the cd works as before - dma timeout+disable on first 
access (by hddtemp).

Now, in 2.6.12-rc5 + todays git snapshot, it does not work any more. I 
suspect the DMA alignment change.

In 2.6.12-rc2 the dmesg from hddtemp was

hdc: DMA disabled
hdc: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
hdc: drive_cmd: error=0x04 { AbortedCommand }
ide: failed opcode was: 0xb0

In todays snapshot, the dmesg is

hdc: DMA interrupt recovery
hdc: lost interrupt
hdc: status timeout: status=0xd0 { Busy }
ide: failed opcode was: unknown
hdc: DMA disabled
hdc: drive not ready for command
hdc: ATAPI reset complete
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)
hdc: lost interrupt
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_FAILED REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)
hdc: lost interrupt
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_FAILED REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)
hdc: lost interrupt
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_FAILED REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)

and so on ad infimum.

The messages are very similar to my earlier reported problems that were 
fixed:
http://www.ussg.iu.edu/hypermail/linux/kernel/0312.3/1003.html
http://www.ussg.iu.edu/hypermail/linux/kernel/0402.1/0459.html


--
Meelis Roos (mroos@linux.ee)
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