linux-kernel - Re: [PATCH] Resurrect IT8172 IDE controller driver

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Message-Id: <200812042037.21323.bzolnier@gmail.com>
Date:	Thu, 4 Dec 2008 20:37:21 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"Shane McDonald" <mcdonald.shane@...il.com>,
	"Sergei Shtylyov" <sshtylyov@...mvista.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Resurrect IT8172 IDE controller driver

On Thursday 04 December 2008, Alan Cox wrote:
> On Thu, 4 Dec 2008 08:01:49 -0600
> "Shane McDonald" <mcdonald.shane@...il.com> wrote:
> 
> > Would it be acceptable to claim that these changes are outside the
> > scope of this patch, and code the IT8172 driver to behave in the same
> > manner as the other wrong drivers, with a suitable comment indicating
> > this fact?
> 
> I think so..  and if its moved over to libata it can just be fixed then

It shouldn't be necessary...

Shane, you can use helpers from <linux/ata.h> just fine in IDE host drivers
so looking at what libata-core helper used by ata_piix.c:

        if (ata_pio_need_iordy(adev))
                control |= 2;   /* IE enable */

is actually doing:

unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
        /* Controller doesn't support  IORDY. Probably a pointless check
           as the caller should know this */
        if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
                return 0;
        /* PIO3 and higher it is mandatory */
        if (adev->pio_mode > XFER_PIO_2)
                return 1;
        /* We turn it on when possible */
        if (ata_id_has_iordy(adev->id))
                return 1;
        return 0;
}

we see that all you need to add in your driver is an additional checking
for ata_id_has_iordy().

Thanks,
Bart

PS when it comes to actually setting the transfer mode on the device
(done in ide_config_drive_speed() core function) IORDY is also handled
just fine (thanks to Sergei).
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