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From: Alan <alan@lxorguk.ukuu.org.uk>
To: Tejun Heo <htejun@gmail.com>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Proposed changes for libata speed handling
Date: Sat, 13 Jan 2007 10:01:58 +0000	[thread overview]
Message-ID: <20070113100158.1d79ba9f@localhost.localdomain> (raw)
In-Reply-To: <45A83DD2.5020000@gmail.com>

O> Wouldn't it be better to have ->determine_xfer_mask() and
> ->set_specific_mode() than having two somewhat overlapping callbacks?
> Or is there some problem that can't be handled that way?

I'm not sure I follow what you are suggesting - can you explain further.

Right now ->set_mode does all the policy management with regards to
picking the right modes which is sometimes done by the usual ATA rules
and sometimes by card specific code.

->set_specific_mode does no policy work but merely sets up a mode.

The default behaviour of ->set_mode() is the ATA mode selection by best
mode available, and this function is normally not provided by a driver.

The default behaviour of ->set_specific_mode() is to verify the mode is
valid then issue ->set_pio|dma_mode() (for both devices in case a timing
change on both is triggered). This function is overridable because of
things like IT821x where the IDE mode is imaginary.

Alan

  reply	other threads:[~2007-01-13  9:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-12 13:53 Alan
2007-01-13  2:02 ` Tejun Heo
2007-01-13 10:01   ` Alan [this message]
2007-01-15  3:09     ` Tejun Heo
2007-01-15 13:52       ` Jeff Garzik

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