* ata_pio_need_iordy vs. CF spec. V4.1
@ 2008-11-24 17:40 David Daney
2008-11-24 17:45 ` Alan Cox
0 siblings, 1 reply; 3+ messages in thread
From: David Daney @ 2008-11-24 17:40 UTC (permalink / raw)
To: IDE/ATA development list
Table 22 on page 51 of CF Specification Rev. 4.1 indicates that iordy is
not supported in PIO5 and PIO6. This seems to be in conflict with the
code in ata_pio_need_iordy, which asserts that it is mandatory in any
mode greater than PIO2.
Which is correct? Or am I misreading something?
Thanks,
David Daney
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ata_pio_need_iordy vs. CF spec. V4.1
2008-11-24 17:40 ata_pio_need_iordy vs. CF spec. V4.1 David Daney
@ 2008-11-24 17:45 ` Alan Cox
2008-11-24 19:02 ` Sergei Shtylyov
0 siblings, 1 reply; 3+ messages in thread
From: Alan Cox @ 2008-11-24 17:45 UTC (permalink / raw)
To: David Daney; +Cc: IDE/ATA development list
On Mon, 24 Nov 2008 09:40:10 -0800
David Daney <ddaney@caviumnetworks.com> wrote:
> Table 22 on page 51 of CF Specification Rev. 4.1 indicates that iordy is
> not supported in PIO5 and PIO6. This seems to be in conflict with the
> code in ata_pio_need_iordy, which asserts that it is mandatory in any
> mode greater than PIO2.
>
> Which is correct? Or am I misreading something?
The ATA spec says that modes > PIO2 requires IORDY
The CFI spec does indeed say PIO5/6 do not use IORDY so probably you
should tweak that function at least for CFA devices.
Alan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ata_pio_need_iordy vs. CF spec. V4.1
2008-11-24 17:45 ` Alan Cox
@ 2008-11-24 19:02 ` Sergei Shtylyov
0 siblings, 0 replies; 3+ messages in thread
From: Sergei Shtylyov @ 2008-11-24 19:02 UTC (permalink / raw)
To: Alan Cox; +Cc: David Daney, IDE/ATA development list
Alan Cox wrote:
>>Table 22 on page 51 of CF Specification Rev. 4.1 indicates that iordy is
>>not supported in PIO5 and PIO6. This seems to be in conflict with the
>>code in ata_pio_need_iordy, which asserts that it is mandatory in any
>>mode greater than PIO2.
>>Which is correct? Or am I misreading something?
> The ATA spec says that modes > PIO2 requires IORDY
> The CFI spec does indeed say PIO5/6 do not use IORDY so probably you
> should tweak that function at least for CFA devices.
Only for them because there probably used to be PIO5 hard disks in the
wild and they hardly ignored IORDY...
> Alan
MBR, Sergei
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-11-24 17:40 ata_pio_need_iordy vs. CF spec. V4.1 David Daney
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