linux-kernel - Re: [PATCH] pata_scc: add proper cable detection method

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Message-Id: <201110121716.37990.bzolnier@gmail.com>
Date:	Wed, 12 Oct 2011 17:16:37 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kou Ishizaki <kou.ishizaki@...hiba.co.jp>,
	Akira Iguchi <akira2.iguchi@...hiba.co.jp>
Subject: Re: [PATCH] pata_scc: add proper cable detection method

Alan Cox wrote:

> On Tue, 11 Oct 2011 20:07:24 +0200
> Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
> 
> > From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > Subject: [PATCH] pata_scc: add proper cable detection method
> > 
> > Use standard ata_cable_80wire() method for the cable detection,
> > as a bonus this allows us to use the default ->prereset method.
> 
> What documentation have you got that confirms that the hardcoding is not
> needed. It goes back to the original code and I see nothing saying that
> the device has standard PC style cable detect.

The driver predates standard cable detect routines and open-codes its
own one.  There should be no functionality changes caused by this patch.

Commit a619f981b ("libata: PATA driver for Celleb") is from Jan 2007
while ata_cable_80wire() was added by commit be0d18d ("libata: cable
detection fixes") in Mar 2007.

> You should also I think cc the Toshiba maintainers

added to cc:.

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] pata_scc: add proper cable detection method

Use standard ata_cable_80wire() method for the cable detection,
as a bonus this allows us to use the default ->prereset method.

Cc: Kou Ishizaki <kou.ishizaki@...hiba.co.jp>
Cc: Akira Iguchi <akira2.iguchi@...hiba.co.jp>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
earlier references:
https://lkml.org/lkml/2009/11/25/373

 drivers/ata/pata_scc.c |   14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

Index: b/drivers/ata/pata_scc.c
===================================================================
--- a/drivers/ata/pata_scc.c
+++ b/drivers/ata/pata_scc.c
@@ -827,18 +827,6 @@ static unsigned int scc_data_xfer (struc
 }
 
 /**
- *	scc_pata_prereset - prepare for reset
- *	@ap: ATA port to be reset
- *	@deadline: deadline jiffies for the operation
- */
-
-static int scc_pata_prereset(struct ata_link *link, unsigned long deadline)
-{
-	link->ap->cbl = ATA_CBL_PATA80;
-	return ata_sff_prereset(link, deadline);
-}
-
-/**
  *	scc_postreset - standard postreset callback
  *	@ap: the target ata_port
  *	@classes: classes of attached devices
@@ -947,7 +935,7 @@ static struct ata_port_operations scc_pa
 	.bmdma_status		= scc_bmdma_status,
 	.sff_data_xfer		= scc_data_xfer,
 
-	.prereset		= scc_pata_prereset,
+	.cable_detect		= ata_cable_80wire,
 	.softreset		= scc_softreset,
 	.postreset		= scc_postreset,
 
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