linux-kernel - Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk

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Date:	Mon, 25 May 2009 15:35:48 +0800
From:	胡洪兵 <huhb@...ote.com>
To:	yanh@...ote.com
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	wuzhangjin@...il.com, linux-mips@...ux-mips.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Philippe Vachon <philippe@...pig.ca>,
	Zhang Le <r0bertz@...too.org>,
	Zhang Fuxin <zhangfx@...ote.com>,
	Arnaud Patard <apatard@...driva.com>,
	loongson-dev@...glegroups.com, gnewsense-dev@...gnu.org,
	Nicholas Mc Guire <hofrat@...r.at>,
	Liu Junliang <liujl@...ote.com>,
	Erwan Lerale <erwan@...scow.com>
Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk

yanh 写道:
> 在 2009-05-23六的 13:47 +0200，Bartlomiej Zolnierkiewicz写道：
>   
>> On Saturday 23 May 2009 09:11:42 yanh wrote:
>>     
>>> 在 2009-05-22五的 20:32 +0200，Bartlomiej Zolnierkiewicz写道：
>>>       
>>>> On Thursday 21 May 2009 00:12:46 wuzhangjin@...il.com wrote:
>>>>         
>>>>> From: Wu Zhangjin <wuzhangjin@...il.com>
>>>>>
>>>>> This is originally from the to-mips branch from
>>>>> http://dev.lemote.com/code/linux_loongson
>>>>>           
>>>> Sadly, the patch description lacks all the important information.
>>>>
>>>> What is the original problem that this fixup tries to address?
>>>>
>>>> Is it limited to amd74xx controllers?
>>>>         
>>> In loongson2f yeeloong machines, the ide controller is AMD cs5536, or
>>> say  amd74xx, and the hard drives is Fujistu. 
>>>       
>> Then it should use the new & shiny :) native cs5536 IDE host driver
>> instead of legacy support in amd74xx...
>>
>>     
>>> While debuging the hard disk suspned and resume, the ide irq can not be
>>> cleared. I guess this is a fake interrupt, hence the clear irq action
>>> can not be finished. 
>>>       
>> AFAICS the only change that the fixup would cause for suspend/resume paths
>> is the one in ide_config_drive_speed() which is called during resume to set
>> transfer mode on the drive:
>>
>>        tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
>>
>>         memset(&tf, 0, sizeof(tf));
>>         tf.feature = SETFEATURES_XFER;
>>         tf.nsect   = speed;
>>
>>         tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);
>>
>>         tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
>> --->
>>         if (drive->quirk_list == 2)
>>                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
>>     
>
>   
>> --->
>>         error = __ide_wait_stat(drive, drive->ready_stat,
>>                                 ATA_BUSY | ATA_DRQ | ATA_ERR,
>>                                 WAIT_CMD, &stat);
>>
>> Please tell me I if understand the issue correctly: if the above quirk is
>> not executed we end up with spurious IRQs, right?
>>     
> right.
>   
>>> This patch is to fix this issue. Maybe other controller and drives also
>>> have this issue, but I am not sure.
>>>       
>> Probably moving it to a generic quirk_drives list later will be useful...
>>
>> Anyway this fixup needs to be ported to / verified with cs5536 first.
>>     
> the cs5536 pata driver have some geode platform dependent codes. We can
> just ignore it, but the performance is poor(using hdparm to test it),
> which only get 22+ MB/s. we find it only use udma2. However if using
> amd74xx driver, it can set udma5, and the speed can reach to 50+ MB/s. 
>
> we will test whether this driver is working well without this patch.
>
> Anyway, thanks your advice.
>   
Use the driver drivers/ata/pata_cs5536.c, unfortunately it also have the 
same issue.
>> Thanks.
>> Bart
>>
>>     
>
>
>
>   


-- 
---------------------------------------------------------
Hongbing,Hu (Software Department)
Tel:    0512-52308631
E-mail:	huhb@...ote.com
MSN:	[huhb04@...il.com]
JiangSu Lemote Corp. Ltd.
MengLan, Yushan, Changshu, JiangSu Province, China
---------------------------------------------------------

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