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Re: [PATCH 1/2] ide: Add tx4939ide driver

To: Bartlomiej Zolnierkiewicz <>
Subject: Re: [PATCH 1/2] ide: Add tx4939ide driver
From: Tejun Heo <>
Date: Sun, 28 Sep 2008 07:09:35 +0900
Cc: Atsushi Nemoto <>,,,,, Jens Axboe <>, James Bottomley <>
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Bartlomiej Zolnierkiewicz wrote:
> On Friday 12 September 2008, Atsushi Nemoto wrote:
>> On Fri, 12 Sep 2008 19:34:06 +0400, Sergei Shtylyov 
>> <> wrote:
> [...]
>>>>>> +        __ide_flush_dcache_range((unsigned long)addr, size);
>>>>>   Why is this needed BTW?
>>>> Do you mean __ide_flush_dcache_range?  This is needed to avoid cache
>>>> inconsistency on PIO drive.  PIO transfer only writes to cache but
>>>> upper layers expects the data is in main memory.
>>>     Hum, then I wonder why it's MIPS specific...
>> SPARC also have it.  And there were some discussions for ARM IIRC.
> I was under the impression that it has been addressed by Tejun at
> the higher-layer level (for both ide/libata) long time ago and that
> MIPS/SPARC code are just a left-overs which could be removed now?

cc'ing Jens and James.  IIRC, I posted several patches but they never
went in.  I don't remember what the objections were or whether any
alternative fix went in.



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