linux-kernel - Re: [PATCH v3 0/4] g_NCR5380: PDMA fixes and cleanup

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Message-ID: <alpine.LNX.2.00.1706272253470.25239@nippy.intranet>
Date:   Tue, 27 Jun 2017 22:54:14 +1000 (AEST)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Michael Schmitz <schmitzmic@...il.com>
cc:     Ondrej Zary <linux@...nbow-software.org>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] g_NCR5380: PDMA fixes and cleanup


On Tue, 27 Jun 2017, Michael Schmitz wrote:

> Ondrej,
> 
> could this be a partial write (target did not transfer the last byte)?
> 

We do wait for TCR_LAST_BYTE_SENT, but only when there is no residual.

Perhaps we should wait for TCR_LAST_BYTE_SENT whenever the 53c400 asserts 
/EOP. That is, whenever BASR_END_DMA_TRANSFER is set.

-- 

> One would suppose the chip posts a phase mismatch in that case ...
> 
> Cheers,
> 
> 	Michael
>