Re: "hde: timeout waiting for DMA": message gone, same behaviour

[Vojtech Pavlik]

On Fri, Sep 21, 2001 at 04:43:04PM -0400, Greg Ward wrote:
> On 21 September 2001, Vojtech Pavlik said:
> > There were updates in 2.4.9-pre2 in the VIA driver, so it might be worth
> > trying. Also disabling CONFIG_IDEDMA_AUTO may work, but you'll get slow
> > performance.
> 
> OK, I've just rebooted with CONFIG_IDEDMA_AUTO not set.  Same thing
> happens; kernel prints "hde: timeout waiting for DMA" at boot time,
> "hdparm /dev/hde" reports DMA on, and "dd if=/dev/hde of=/dev/null
> count=1" takes about 20 sec to complete.  (Hmmm: in previous builds,
> the kernel would turn DMA off for me after that long DMA timeout delay.
> It no longer does so.  If I "hdparm -d0 /dev/hde", then there's no
> long delay on read.)
> 
> > Afterwards, though, you can do hdparm -i /dev/hd*
> 
> cthulhu:~# hdparm -i /dev/hde
> 
> /dev/hde:
> 
>  Model=ST380021A, FwRev=3.05, SerialNo=3HV03HSB
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
>  BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
>  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488
>  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes: pio0 pio1 pio2 pio3 pio4 
>  DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 

Looks good, drive set to UDMA100 ...

> 
> > and cat /proc/ide/via
> 
> OK, but the VIA controller is ide0 and ide1, which are unused -- nothing
> is connected to either one.  The only IDE device in the system right now
> is the brand-new Seagate 80 GB ATA/100 drive at hde1 (on ide2, which is
> controlled by the Promise chip).

Oh, but I can't help you much with the Promise chip. I may help you get
the drive working on UDMA66 off the VIA chip, tho.

> So here's the kernel's picture of both
> the VIA and Promise controllers:
> 
> cthulhu:~# cat /proc/ide/via 
> ----------VIA BusMastering IDE Configuration----------------
> Driver Version:                     3.23
> South Bridge:                       VIA vt82c686a
> Revision:                           ISA 0x22 IDE 0x10
> Highest DMA rate:                   UDMA66
> BM-DMA base:                        0xd800
> PCI clock:                          33MHz
> Master Read  Cycle IRDY:            0ws
> Master Write Cycle IRDY:            0ws
> BM IDE Status Register Read Retry:  yes
> Max DRDY Pulse Width:               No limit
> -----------------------Primary IDE-------Secondary IDE------
> Read DMA FIFO flush:          yes                 yes
> End Sector FIFO flush:         no                  no
> Prefetch Buffer:               no                  no
> Post Write Buffer:             no                  no
> Enabled:                      yes                 yes
> Simplex only:                  no                  no
> Cable Type:                   40w                 40w
> -------------------drive0----drive1----drive2----drive3-----
> Transfer Mode:        PIO       PIO       PIO       PIO
> Address Setup:      120ns     120ns     120ns     120ns
> Cmd Active:         480ns     480ns     480ns     480ns
> Cmd Recovery:       480ns     480ns     480ns     480ns
> Data Active:        330ns     330ns     330ns     330ns
> Data Recovery:      270ns     270ns     270ns     270ns
> Cycle Time:         600ns     600ns     600ns     600ns
> Transfer Rate:    3.3MB/s   3.3MB/s   3.3MB/s   3.3MB/s

Looks OK, no drives present.

> cthulhu:~# cat /proc/ide/pdc202xx 
> 
>                                 PDC20265 Chipset.
> ------------------------------- General Status ---------------------------------
> Burst Mode                           : enabled
> Host Mode                            : Normal
> Bus Clocking                         : 33 PCI Internal
> IO pad select                        : 10 mA
> Status Polling Period                : 0
> Interrupt Check Status Polling Delay : 0
> --------------- Primary Channel ---------------- Secondary Channel -------------
>                 enabled                          enabled 
> 66 Clocking     enabled                          disabled
>            Mode PCI                         Mode PCI   
>                 FIFO Empty                       FIFO Empty  
> --------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------
> DMA enabled:    no               yes             no                no 
> DMA Mode:       UDMA 4           NOTSET          NOTSET            NOTSET
> PIO Mode:       PIO 4            NOTSET           NOTSET            NOTSET

Controller set to UDMA66. This may be a problem ...

Can you try 'hdparm -X68 -d1 /dev/hde'? This should enable UDMA66 on the
drive as well. This won't be top speed, but could work ...

> > which will tell us interesting information, which may
> > lead us further to solving the problem.
> 
> Well, I hope it means something to you!  
> 
> > Btw, what clock and multiplier
> > your CPU is?
> 
> 800 MHz Athlon.  Not sure what the multiplier is -- I don't mess with
> that stuff.

That's OK.

> -- 
> Greg Ward - Unix bigot                                  [e-mail]
> http://starship.python.net/~gward/
> The world is coming to an end.  Please log off.

-- 
Vojtech Pavlik
SuSE Labs