linux-kernel - Re: HPT374 IDE problem with 2.6.21.* kernels

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Date:	Tue, 05 Jun 2007 18:14:46 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Geller Sandor <wildy@...ra.hos.u-szeged.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: HPT374 IDE problem with 2.6.21.* kernels

Hello, I wrote:

>> I felt inspired by this explanation (thanks!) and took a look at
>> hpt374-opensource-v2.10 vendor driver.  Here is something interesting:

>> glbdata.c:

>> ...
>> #ifdef CLOCK_66MHZ
>> ULONG setting370_66[] = {
>>         0xd029d5e,  0xd029d26,  0xc829ca6,  0xc829c84,  0xc829c62,
>>         0x2c829d2c, 0x2c829c66, 0x2c829c62,
>>         0x1c829c62, 0x1c9a9c62, 0x1c929c62, 0x1c8e9c62, 0x1c8a9c62,
>>         0x1c8a9c62/*0x1cae9c62*/, 0x1c869c62, 0x1c869c62,
>> };
>> ...

>> hpt366.c:

>> ...
>> static u32 sixty_six_base_hpt37x[] = {
>>         /* XFER_UDMA_6 */       0x1c869c62,
>>         /* XFER_UDMA_5 */       0x1cae9c62,     /* 0x1c8a9c62 */
>> ...

>> So we are using Dual ATA Clock for UDMA5 whereas vendor driver doesn't

>    This is so in all other HPT drivers (and HPT371N datasheet has the 
> same figures -- this chip is the only one supporting UDMA6 and having 
> the default DPLL clock > 50 MHz).

    What I meant to say was the only one I have a datasheet for. :-)

MBR, Sergei

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