Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3. -- Linux for MIPS


Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
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To: Huacai Chen <chenhuacai@xxxxxxxxx>
Subject: Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Mon, 18 Jun 2012 16:52:31 +0200
Cc: Sergei Shtylyov <sshtylyov@xxxxxxxxxx>, Ralf Baechle <ralf@xxxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxx, Fuxin Zhang <zhangfx@xxxxxxxxxx>, Zhangjin Wu <wuzhangjin@xxxxxxxxx>, Huacai Chen <chenhc@xxxxxxxxxx>, Hongliang Tao <taohl@xxxxxxxxxx>, Hua Yan <yanh@xxxxxxxxxx>, linux-ide@xxxxxxxxxxxxxxx
In-reply-to: <CAAhV-H5g2Y81fr=yU76RHDfzDSxG_7GpTs=RZm8ha8JbzHnfzQ@mail.gmail.com>
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, Jun 18, 2012 at 06:41:58PM +0800, Huacai Chen wrote:
> Ohh, this is because Loongson-3 has a hardware bug, when the HT
> controller receive a 64-bit DMA address, the high bits is lost. So set
> to 32-bit DMA is just a workaround.

Ok, this should definitely go into the commit message of your patch then
since it explains why you need that flag set.

Thanks.

-- 
Regards/Gruss,
Boris.

References:
- [PATCH 00/14] MIPS: Add Loongson-3 based machines support.
  - From: Huacai Chen
- [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: Huacai Chen
- Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: Sergei Shtylyov
- Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: huacai chen
- Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: Borislav Petkov
- Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: huacai chen
- Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: Borislav Petkov
- Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.
  - From: Huacai Chen

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