http://bugzilla.kernel.org/show_bug.cgi?id=12714 Summary: [pata_ali] ATAPI UltraDMA on secondary channel broken Product: IO/Storage Version: 2.5 KernelVersion: 2.6.27 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: blocking Priority: P1 Component: IDE AssignedTo: io_ide@xxxxxxxxxxxxxxxxxxxx ReportedBy: jtsn@xxxxxx Latest working kernel version: 2.6.24 (with libata) Earliest failing kernel version: confirmed 2.6.27 (with libata), possibly 2.6.25 Distribution: Slackware 12.2 Hardware Environment: 00:12.0 IDE interface [0101]: ALi Corporation M5229 IDE [10b9:5229] (rev c7) See http://bugzilla.kernel.org/show_bug.cgi?id=9904 for more hardware info. Problem Description: Linux 2.6.24 (Slackware 12.1) pata_ali driver worked reliable in ATAPI UltraDMA mode reading and writing media on both channels, beside the cable detection issue mentioned in bug #9904 (which occured only with this specific ASUS drive). The 2.6.27 driver completely disables ATAPI DMA and the atapi_dma=1 modparm brings it back only on the primary channel. pata_ali 0000:00:12.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19 scsi3 : pata_ali scsi4 : pata_ali ata4: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14 ata5: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xff08 irq 15 ata4.00: ATAPI: PIONEER DVD-RW DVR-212, 1.28, max UDMA/66 ata4.00: configured for UDMA/66 ata5.00: ATAPI: MATSHITADVD-RAM SW-9576S, AY0J, max UDMA/66 ata5.00: simplex DMA is claimed by other device, disabling DMA ata5.00: configured for PIO4 # hdparm -t /dev/sr1 /dev/sr1: Timing buffered disk reads: 6 MB in 3.18 seconds = 1.89 MB/sec So the secondary channel is completely unusable now with libata. Also I see no sense in the atapi_dma switch and its default (off), because ATAPI DMA was fine on 2.6.24. There might be a tunable for buggy hardware, but this default (which does not work with modern DVD writers at all) is bogus and should be changed. -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. -- 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
