linux-kernel - Re: [PATCH 1/1] Add support 2 SATA ports for Maui and change filename from sata_dwc_460ex.c to sata_dwc

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Message-ID: <4F883640.60103@pobox.com>
Date:	Fri, 13 Apr 2012 10:20:48 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Thang Nguyen <tqnguyen@....com>
CC:	Sergei Shtylyov <sshtylyov@...sta.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Phong Vo <pvo@....com>
Subject: Re: [PATCH 1/1] Add support 2 SATA ports for Maui and change filename
 from sata_dwc_460ex.c to sata_dwc_4xx.c

On 04/13/2012 03:18 AM, Thang Nguyen wrote:
> Thanks Jeff and Sergei,
>
> As your suggestion, I will separate the patch into smaller patches and
> support more features on the SATA DWC driver. The patches I intend to do
> on the SATA DWC are as below:
>   - Support hardreset: currently the hardreset is not supported. This
> causes sometime the SATA driver does cause kernel crash because of
> not-determined state.
>   - Let device tree specified DMA channel: currently only channel 0 is
> supported (number of channel is set to 1). If device tree not specified
> DMA channel, channel 0 will be used as default.
>   - Support ATAPI.
>   - Remove dma_interrupt_count. for each DMA transfer, we need 2 interrupts
> for QC completion: transfer completion and DMA transfer completion
> interrupt. The current code wait for both 2 interrupts occur before
> calling qc_complete. This will make out-of-sync state when an interrupt
> lost or when errors occur. The change will process DMA register when DMA
> transfer complete interrupt occur and call qc_issue when command
> completion interrupt occur.
>   - Fix NCQ issue and set .can_queue back to ATA_MAX_QUEUE.
>   - Support Port Multiplier.
>   - Support 2 SATA ports on Maui.

Sounds good, thanks for splitting up the patch into smaller pieces.  The 
main goal is that separate logical changes should go into separate patches.

	Jeff




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