Re: [PATCH ht6560b] Force prefetch for some devices

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

Hello.

Jan Evert van Grootheest wrote:

> Prefetch needs to be set for some ide devices to work when connected to

    Prefetch bit seems to mean 1=disable, 0=enable despite what the datasheet 
says...

> a ht6560b interface. This was not always done properly, causing a system
> with a HD and CD on the primary interface to not work properly. Or, in
> effect, hang hard.

> This patch forces prefetch on devices before checking whether it
> is necessary to change the settings in the interface

> This patch should also be applied to 2.4. I don't currently have a
> 2.4 tree around.

> (also change my email address)

> Signed-off-by: Jan Evert van Grootheest <janevert@caiway.nl>

    Please send the patch to the current 2.4 maintainer, after applying it to 
the 2.4 tree which you can download on kernel.org.

> ------------------------------------------------------------------------
> 
> --- linux-2.6.git/drivers/ide/legacy/ht6560b.c	2008-02-01 18:50:31.000000000 +0100
> +++ linux-2.6.24/drivers/ide/legacy/ht6560b.c	2008-02-18 13:48:59.000000000 +0100
> @@ -23,18 +23,21 @@
>   *                      "Prefetch" mode bit OFF for ide disks and
>   *                      ON for anything else.
>   *
> + *  Version 0.08        Need to force prefetch for CDs and other non-disk
> + *                      devices. (not sure which devices exactly need
> + *                      prefetch)
>   *

    Hard disks only ai guess, i.e. non-ATAPI device.

MBR, Sergei