matthieu castet wrote: > Jeff Garzik wrote: > >> Data point #3 (or #0...): >> >> This appears to be a _device_ that sends its interrupt early. Hi, I've tested the 4KUS CDR-6S48 drive + Promise pdc20275 controller with current libata upstream (to be 2.6.18. I guess current upstream doesn't have the via-pata-controller-xfer-fixes.patch). However, cannot reproduce the early interrupt problem on my machine. >> >> If that is the case, the device may appear on any controller, not just >> VIA, and we would have to handle it globally via a device special-case >> in libata-core. >> > > For the record, the cdrom writer that need this quirk on pata via, works > on pata sil680. > But 3 microsecond is very short, and the problem could be hidden by the > controller, or other stuffs. > > If it is the problem of the specific ATAPI device, all controllers should be affected, not only VIA. So, strange not seeing the problem on Promise. Could you please test the current libata-upstream tree and turn on ATA_DEBUG and ATA_VERBOSE_DEBUG in include/linux/libata.h. If possible, could you also submit the libata log related to the early/lost irq. (Heard about the ATAPI early interrupt problem, but never had chance to see how libata behaves with such device. Really curious about this problem.) Thanks, Albert --- boot dmesg of the CDR-6S48 on my box. xfer mode set to UDMA/33 without problem. pata_pdc2027x 0000:02:05.0: version 0.74-ac3 ACPI: PCI Interrupt 0000:02:05.0[A] -> Link [LNK1] -> GSI 10 (level, low) -> IRQ 10 pata_pdc2027x 0000:02:05.0: PLL input clock 16740 kHz ata3: PATA max UDMA/133 cmd 0xE09E17C0 ctl 0xE09E1FDA bmdma 0xE09E1000 irq 10 ata4: PATA max UDMA/133 cmd 0xE09E15C0 ctl 0xE09E1DDA bmdma 0xE09E1008 irq 10 scsi2 : pata_pdc2027x ata3.00: configured for UDMA/33 ata3.01: configured for UDMA/33 scsi3 : pata_pdc2027x ata4.00: configured for UDMA/33 Vendor: LITE-ON Model: CD-RW SOHR-5238S Rev: 4S07 Type: CD-ROM ANSI SCSI revision: 05 Vendor: HL-DT-ST Model: DVDRAM GSA-4163B Rev: A101 Type: CD-ROM ANSI SCSI revision: 05 Vendor: CD-RW Model: CDR-6S48 Rev: 2SG1 Type: CD-ROM ANSI SCSI revision: 05 sr0: scsi3-mmc drive: 93x/52x writer cd/rw xa/form2 cdda tray Uniform CD-ROM driver Revision: 3.20 sr 2:0:0:0: Attached scsi CD-ROM sr0 sr1: scsi3-mmc drive: 40x/40x writer dvd-ram cd/rw xa/form2 cdda tray sr 2:0:1:0: Attached scsi CD-ROM sr1 sr2: scsi3-mmc drive: 48x/48x writer cd/rw xa/form2 cdda tray sr 3:0:0:0: Attached scsi CD-ROM sr2 - : 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
