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

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Date:	Thu, 12 May 2011 16:05:09 +0400
From:	Igor Plyatov <plyatov@...il.com>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	stf_xl@...pl
Subject: Re: [PATCH] ATA: pata_at91.c bugfixes

Hi Jeff!

> 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.

Thank you for info!

I will update this patch.

Best regards!

-- 
Igor Plyatov

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