From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Robert Hancock <hancockr@shaw.ca>
Cc: Mark Lord <liml@rtr.ca>, Alan Cox <alan@redhat.com>,
Tejun Heo <htejun@gmail.com>, Jeff Garzik <jgarzik@pobox.com>,
Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
ide <linux-ide@vger.kernel.org>
Subject: Re: PIO with SSDs: needs a long DRQ-after-command timeout for WRITEs
Date: Wed, 31 Dec 2008 21:06:04 +0300 [thread overview]
Message-ID: <495BB48C.3090408@ru.mvista.com> (raw)
In-Reply-To: <495BACD2.6020500@shaw.ca>
Robert Hancock wrote:
>>> No idea about IDE, but libata does not wait at all for DRQ assertion
>>> specifically, after issuing the PIO command it waits for BSY to be
>>> deasserted and then expects either DRQ, DF or ERR to be set, else
>>> it's a host state machine violation and triggers error handling.
>>> According to the ATA spec, the device is specifically not allowed to
>>> set DRQ to one while BSY is not asserted.
> IDE is really only waiting 50msec in this case? That seems rather
The whole 100 ms if you look at how WAIT_DRQ is #define'd...
MBR, Sergei
prev parent reply other threads:[~2008-12-31 18:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-30 13:53 PIO with SSDs: needs a long DRQ-after-command timeout for WRITEs Mark Lord
2008-12-30 13:59 ` Alan Cox
2008-12-31 16:29 ` Mark Lord
2008-12-31 18:38 ` Bartlomiej Zolnierkiewicz
2008-12-31 20:30 ` Mark Lord
2008-12-30 18:14 ` Robert Hancock
[not found] ` <495B9D31.6080904@rtr.ca>
2008-12-31 17:33 ` Robert Hancock
2008-12-31 18:03 ` Sergei Shtylyov
2008-12-31 18:06 ` Sergei Shtylyov [this message]
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