linux-kernel - Re: [PATCH pata-2.6 fix] hpt366: disallow Ultra133 for HPT374

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Message-Id: <20070606185455.fc264488.akpm@linux-foundation.org>
Date:	Wed, 6 Jun 2007 18:54:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	bzolnier@...il.com, wildy@...ra.hos.u-szeged.hu,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH pata-2.6 fix] hpt366: disallow Ultra133 for HPT374

On Wed, 6 Jun 2007 23:53:28 +0400 Sergei Shtylyov <sshtylyov@...mvista.com> wrote:

> Eliminate UltraATA/133 support for HPT374 -- the chip isn't capable of this mode
> according to the manual, and doesn't even seem to tolerate 66 MHz DPLL clock...
> 
> Signed-off-by: Sergei Shtylyov <sshtylyov@...mvista.com>
> 
> ---
>  drivers/ide/pci/hpt366.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> Index: linux-2.6/drivers/ide/pci/hpt366.c
> ===================================================================
> --- linux-2.6.orig/drivers/ide/pci/hpt366.c
> +++ linux-2.6/drivers/ide/pci/hpt366.c
> @@ -1,5 +1,5 @@
>  /*
> - * linux/drivers/ide/pci/hpt366.c		Version 1.03	May 4, 2007
> + * linux/drivers/ide/pci/hpt366.c		Version 1.04	Jun 4, 2007

argh.  Please just delete this version numbering.  It's a sure-fire way of
maximising patch conflicts.

It's 1.10 in Bart's tree.

>   * Copyright (C) 1999-2003		Andre Hedrick <andre@...ux-ide.org>
>   * Portions Copyright (C) 2001	        Sun Microsystems, Inc.
> @@ -106,7 +106,8 @@
>   *   switch  to calculating  PCI clock frequency based on the chip's base DPLL
>   *   frequency
>   * - switch to using the  DPLL clock and enable UltraATA/133 mode by default on
> - *   anything  newer than HPT370/A
> + *   anything  newer than HPT370/A (except HPT374 that is not capable of this
> + *   mode according to the manual)
>   * - fold PCI clock detection and DPLL setup code into init_chipset_hpt366(),
>   *   also fixing the interchanged 25/40 MHz PCI clock cases for HPT36x chips;
>   *   unify HPT36x/37x timing setup code and the speedproc handlers by joining
> @@ -365,7 +366,6 @@ static u32 sixty_six_base_hpt37x[] = {
>  };
>  
>  #define HPT366_DEBUG_DRIVE_INFO		0
> -#define HPT374_ALLOW_ATA133_6		1
>  #define HPT371_ALLOW_ATA133_6		1
>  #define HPT302_ALLOW_ATA133_6		1
>  #define HPT372_ALLOW_ATA133_6		1
> @@ -450,7 +450,7 @@ static struct hpt_info hpt370a __devinit
>  
>  static struct hpt_info hpt374 __devinitdata = {
>  	.chip_type	= HPT374,
> -	.max_mode	= HPT374_ALLOW_ATA133_6 ? 4 : 3,
> +	.max_mode	= 3,
>  	.dpll_clk	= 48,
>  	.settings	= hpt37x_settings
>  };

The code in Bart's tree has

static struct hpt_info hpt374 __devinitdata = {
	.chip_type	= HPT374,
	.max_ultra	= HPT374_ALLOW_ATA133_6 ? 6 : 5,
	.dpll_clk	= 48,
	.settings	= hpt37x_settings
};

I can handle the renaming, but note that Bart's tree has different values
as well.

-
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