[BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata driver, NV CK804 ide controller.

Hi,

since upgrading to kernel 2.6.20 my pata disk, using new pata driver, is initialized maximum in DMA33 mode, as you can see from:

pata_amd 0000:00:06.0: version 0.2.7
PCI: Setting latency timer of device 0000:00:06.0 to 64
ata5: PATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xF000 irq 14
ata6: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xF008 irq 15
scsi4 : pata_amd
ata5.00: ATA-7, max UDMA/100, 156368016 sectors: LBA48
ata5.00: ata5: dev 0 multi count 1
ata5.00: configured for UDMA/33
scsi5 : pata_amd
ata6.00: ATAPI, max UDMA/33
ata6.00: configured for UDMA/33

scsi 4:0:0:0: Direct-Access ATA SAMSUNG SP0822N WA10 PQ: 0 ANSI: 5

SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00

SCSI device sdc: write cache: enabled, read cache: enabled, doesn't support DPO

or FUA
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00

SCSI device sdc: write cache: enabled, read cache: enabled, doesn't support DPO

or FUA
 sdc: sdc1 sdc2 sdc3
sd 4:0:0:0: Attached scsi disk sdc


while with kernel 2.6.19.X it was initialized correctly in DMA100 mode:

pata_amd 0000:00:06.0: version 0.2.4
PCI: Setting latency timer of device 0000:00:06.0 to 64
ata5: PATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xF000 irq 14
ata6: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xF008 irq 15
scsi4 : pata_amd
ata5.00: ATA-7, max UDMA/100, 156368016 sectors: LBA48
ata5.00: ata5: dev 0 multi count 1
ata5.00: configured for UDMA/100
scsi5 : pata_amd
ata6.00: ATAPI, max UDMA/33
ata6.00: configured for UDMA/33
scsi 4:0:0:0: Direct-Access     ATA     SAMSUNG SP0822N  WA10 PQ: 0 ANSI: 5
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
 sdc: sdc1 sdc2 sdc3
sd 4:0:0:0: Attached scsi disk sdc

I have other 2 sata disks on this system, and I have no problems with them. I Wonder if this is due to some controller/disk problem triggered just by 2.6.20 kernel (I saw there are a lot of changes into eh code), while 2.6.19.X and previous sees everything OK.

This system is an Athlon64 X2 3800+ with an nvidia2 IDE controller

here is the lspci -v

00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)

        Subsystem: ASUSTeK Computer Inc. Unknown device 815a
        Flags: bus master, 66MHz, fast devsel, latency 0
        Capabilities: [44] HyperTransport: Slave or Primary Interface
        Capabilities: [e0] HyperTransport: MSI Mapping

00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
        Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
        Flags: bus master, 66MHz, fast devsel, latency 0

00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
        Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
        Flags: 66MHz, fast devsel, IRQ 10
        I/O ports at e400 [size=32]
        I/O ports at 4c00 [size=64]
        I/O ports at 4c40 [size=64]
        Capabilities: [44] Power Management version 2

00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2) (prog-if 10 [OHCI])

        Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 20
        Memory at d4004000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [44] Power Management version 2

00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3) (prog-if 20 [EHCI])

        Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 22
        Memory at d4005000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [44] Debug port
        Capabilities: [80] Power Management version 2

00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)

        Subsystem: ASUSTeK Computer Inc. Unknown device 8166
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
        I/O ports at dc00 [size=256]
        I/O ports at e000 [size=256]
        Memory at d4003000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [44] Power Management version 2

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

[virtual] Memory at 000001f0 (32-bit, non-prefetchable) [disabled] [size=8] [virtual] Memory at 000003f0 (type 3, non-prefetchable) [disabled] [size=1] [virtual] Memory at 00000170 (32-bit, non-prefetchable) [disabled] [size=8] [virtual] Memory at 00000370 (type 3, non-prefetchable) [disabled] [size=1]

        I/O ports at f000 [size=16]
        Capabilities: [44] Power Management version 2

00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3) (prog-if 85 [Master SecO PriO])

        Subsystem: ASUSTeK Computer Inc. Unknown device 815a
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
        I/O ports at 09f0 [size=8]
        I/O ports at 0bf0 [size=4]
        I/O ports at 0970 [size=8]
        I/O ports at 0b70 [size=4]
        I/O ports at d800 [size=16]
        Memory at d4002000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [44] Power Management version 2

00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3) (prog-if 85 [Master SecO PriO])

        Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 22
        I/O ports at 09e0 [size=8]
        I/O ports at 0be0 [size=4]
        I/O ports at 0960 [size=8]
        I/O ports at 0b60 [size=4]
        I/O ports at c400 [size=16]
        Memory at d4001000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [44] Power Management version 2

00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2) (prog-if 01 [Subtractive decode])

        Flags: bus master, 66MHz, fast devsel, latency 0
        Bus: primary=00, secondary=05, subordinate=05, sec-latency=128
        I/O behind bridge: 0000a000-0000afff
        Memory behind bridge: d2000000-d3ffffff
        Prefetchable memory behind bridge: 88000000-880fffff

00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
        Subsystem: ASUSTeK Computer Inc. Unknown device 816a
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
        Memory at d4000000 (32-bit, non-prefetchable) [size=4K]
        I/O ports at b000 [size=8]
        Capabilities: [44] Power Management version 2

00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
        Capabilities: [40] Power Management version 2

Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+

        Capabilities: [58] HyperTransport: MSI Mapping
        Capabilities: [80] Express Root Port (Slot+) IRQ 0
        Capabilities: [100] Virtual Channel

00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
        Capabilities: [40] Power Management version 2

Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+

        Capabilities: [58] HyperTransport: MSI Mapping
        Capabilities: [80] Express Root Port (Slot+) IRQ 0
        Capabilities: [100] Virtual Channel

00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
        Capabilities: [40] Power Management version 2

Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+

        Capabilities: [58] HyperTransport: MSI Mapping
        Capabilities: [80] Express Root Port (Slot+) IRQ 0
        Capabilities: [100] Virtual Channel

00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        I/O behind bridge: 00009000-00009fff
        Memory behind bridge: d0000000-d1ffffff

Prefetchable memory behind bridge: 00000000c0000000-00000000cff00000

        Capabilities: [40] Power Management version 2

Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+

        Capabilities: [58] HyperTransport: MSI Mapping
        Capabilities: [80] Express Root Port (Slot+) IRQ 0
        Capabilities: [100] Virtual Channel

00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration

        Flags: fast devsel
        Capabilities: [80] HyperTransport: Host or Secondary Interface

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address

Map
        Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller

        Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control

        Flags: fast devsel

01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300

(PCIE)] (prog-if 00 [VGA])
        Subsystem: PC Partner Limited Unknown device 1490
        Flags: bus master, fast devsel, latency 0, IRQ 3
        Memory at c0000000 (32-bit, prefetchable) [size=256M]
        I/O ports at 9000 [size=256]
        Memory at d1000000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at d0000000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] Express Endpoint IRQ 0

Capabilities: [80] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-

        Capabilities: [100] Advanced Error Reporting

01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
        Subsystem: PC Partner Limited Unknown device 1491
        Flags: fast devsel

Memory at d1010000 (32-bit, non-prefetchable) [disabled] [size=64K]

        Capabilities: [50] Power Management version 2
        Capabilities: [58] Express Endpoint IRQ 0

05:02.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80) (prog-if 10 [OHCI])

        Subsystem: ASUSTeK Computer Inc. A8V Deluxe
        Flags: bus master, stepping, medium devsel, latency 32, IRQ 19
        Memory at d3001000 (32-bit, non-prefetchable) [size=2K]
        I/O ports at a000 [size=128]
        Capabilities: [50] Power Management version 2

05:04.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 78) Subsystem: 3Com Corporation 3C905C-TX Fast Etherlink for PC Management NIC

        Flags: bus master, medium devsel, latency 32, IRQ 17
        I/O ports at a400 [size=128]
        Memory at d3000000 (32-bit, non-prefetchable) [size=128]
        [virtual] Expansion ROM at 88000000 [disabled] [size=128K]
        Capabilities: [dc] Power Management version 2


Willing to test any patch.

thanx


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