linux-kernel - Re: [PATCH] ATA: pata

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Message-ID: <4DB4433A.5000609@pobox.com>
Date:	Sun, 24 Apr 2011 11:35:22 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Igor Plyatov <plyatov@...il.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	stf_xl@...pl
Subject: Re: [PATCH] ATA: pata_at91.c bugfixes

On 04/20/2011 07:44 AM, Igor Plyatov wrote:
> * Fix "initial_timing" structure initialisation. The "struct ata_timing" must
>    contain 10 members, but ".dmack_hold" member was not initialised.
> * The AT91SAM9 microcontrollers use special coding scheme for SMC_SETUP,
>    SMC_PULSE, SMC_CYCLE registers.
>    Old driver operates correctly only with low master clock values, but
>    with high master clock it incorrectly calculates SMC values and stops
>    to operate, because SMC can be setup only to admissible ranges in special
>    format.
>    New code correctly calculates SMC registers values, adjusts calculated
>    to admissible ranges, enlarges cycles if required and converts values
>    into SMC's format.
> * Old driver calculates CS_SETUP and CS_PULSE cycles incorrectly
>    because of wrong assumptions.
>    New code calculates:
>        CS_SETUP = SETUP/2
>        CS_PULSE = PULSE + SETUP/2 + HOLD/2
> * This fixes allows to correctly operate with any master clock frequency.
>
> Signed-off-by: Igor Plyatov<plyatov@...il.com>
> ---
>   drivers/ata/pata_at91.c |  223 ++++++++++++++++++++++++++++++++---------------
>   1 files changed, 154 insertions(+), 69 deletions(-)

FYI, the two previous "v4" patches are now applied.

Based on the comments from Stanislaw, this patch would need to be 
updated anyway.
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