From mboxrd@z Thu Jan  1 00:00:00 1970
From: viresh kumar <viresh.kumar@st.com>
Subject: Re: MWDMA Issue: sda: unknown partition table
Date: Fri, 21 Jan 2011 17:29:39 +0530
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To: Tejun Heo <tj@kernel.org>
Cc: viresh kumar <viresh.kumar@st.com>, "linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>, Shiraz HASHIM <shiraz.hashim@st.com>, Armando VISCONTI <armando.visconti@st.com>, amitgoel <amit.goel@st.com>, viresh kumar <viresh.nitj@gmail.com>

On 01/21/2011 03:58 PM, viresh kumar wrote:
> Tejun,
> 
> Thanks for your prompt reply!!
> 
> On 01/21/2011 03:44 PM, Tejun Heo wrote:
>> On Fri, Jan 21, 2011 at 03:39:56PM +0530, viresh kumar wrote:
>>>> I am implementing mwdma interface for arasan compact flash controller.
>>>> I am facing a strange problem, when i insert CF card on my board (after bootup),
>>>> in mwdma mode, i get following:
>>>>
>>>> ata1: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
>> That's AC_ERR_ATA_BUS.
>>
>>>> Can somebody give any clue on which part i should try to look at?
>> Yeah, someone is reporting CRC error.
> 
> I will check this.
> 
> But it seems unknown partition table is a different issue,
> as this error is also coming in PIO mode, where i am able to get sda1 node
> and able to read/write to card.
> 
> print in PIO mode:
> 
> # ata1: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
> ata1: soft resetting link
> ata1.00: CFA: TRANSCEND, 20091215, max UDMA/66
> ata1.00: 62537328 sectors, multi 0: LBA 
> ata1.00: configured for PIO6
> ata1.00: configured for PIO6
> ata1: EH complete
> scsi 0:0:0:0: Direct-Access     ATA      TRANSCEND        2009 PQ: 0 ANSI: 5
> sd 0:0:0:0: Attached scsi generic sg0 type 0
> sd 0:0:0:0: [sda] 62537328 512-byte logical blocks: (32.0 GB/29.8 GiB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
>  sda: sda1
> sd 0:0:0:0: [sda] Attached SCSI disk
> 

Tejun,

This error:
> # ata1: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen

is coming only when i insert/remove my card after board has booted up. If i keep it
inserted, and then boot the board: No such error occurs.

As suggested by you earlier, i am doing following on card insertion and removal,
after resetting card through controller.

		ata_ehi_hotplugged(ehi);
		ata_port_freeze(ap);

and after that only i get that error message through following path:
Kthread()->scsi_error_handler()->ata_scsi_error()->ata_bmdma_error_handler()
->ata_sff_error_handler()->ata_do_eh()

I tried again, but couldn't find why i am getting these two issues:
	ata1: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
	sda: unknown partition table

-- 
viresh