linux-kernel - Re: [PATCH] mtd: nand: raw: qcom_nandc: Don't clear_bam

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Date:   Mon, 31 Jan 2022 10:52:20 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Sricharan Ramabadhran <sricharan@...eaurora.org>
Cc:     Manivannan Sadhasivam <mani@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mdalam@...eaurora.org
Subject: Re: [PATCH] mtd: nand: raw: qcom_nandc: Don't clear_bam_transaction
 on READID

Hi Sricharan,

sricharan@...eaurora.org wrote on Fri, 28 Jan 2022 23:20:04 +0530:

> Hi Konrad,
> 
> On 1/28/2022 9:55 AM, Sricharan Ramabadhran wrote:
> > Hi Miquel,
> >
> > On 1/26/2022 4:12 PM, Miquel Raynal wrote:  
> >> Hi Mani,
> >>
> >> mani@...nel.org wrote on Wed, 26 Jan 2022 16:03:16 +0530:
> >>  
> >>> On Wed, Jan 26, 2022 at 11:16:13AM +0100, Miquel Raynal wrote:  
> >>>> Hello,
> >>>>
> >>>> miquel.raynal@...tlin.com wrote on Fri, 14 Jan 2022 08:27:18 +0100:  
> >>>>> Hi Konrad,
> >>>>>
> >>>>> konrad.dybcio@...ainline.org wrote on Thu, 13 Jan 2022 19:44:26 >>>>> +0100:  
> >>>>>> While I have absolutely 0 idea why and how, running >>>>>> clear_bam_transaction
> >>>>>> when READID is issued makes the DMA totally clog up and refuse to >>>>>> function
> >>>>>> at all on mdm9607. In fact, it is so bad that all the data gets >>>>>> garbled
> >>>>>> and after a short while in the nand probe flow, the CPU decides that
> >>>>>> sepuku is the only option.
> >>>>>>
> >>>>>> Removing _READID from the if condition makes it work like a >>>>>> charm, I can
> >>>>>> read data and mount partitions without a problem.
> >>>>>>
> >>>>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> >>>>>> ---
> >>>>>> This is totally just an observation which took me an inhumane >>>>>> amount of
> >>>>>> debug prints to find.. perhaps there's a better reason behind >>>>>> this, but
> >>>>>> I can't seem to find any answers.. Therefore, this is a BIG RFC!  
> >>>>> I'm adding two people from codeaurora who worked a lot on this >>>>> driver.
> >>>>> Hopefully they will have an idea :)  
> >>>> Sadre, I've spent a significant amount of time reviewing your patches,
> >>>> now it's your turn to not take a month to answer to your peers
> >>>> proposals.
> >>>>
> >>>> Please help reviewing this patch.  
> >>> Sorry. I was hoping that Qcom folks would chime in as I don't have >>> any idea
> >>> about the mdm9607 platform. It could be that the mail server >>> migration from
> >>> codeaurora to quicinc put a barrier here.
> >>>
> >>> Let me ping them internally.  
> >> Oh, ok, I didn't know. Thanks!  
> >
> >    Sorry Miquel, somehow we did not get this email in our inbox.
> >    Thanks to Mani for pinging us, we will test this up today and get > back.
> >  
>        While we could not reproduce this issue on our ipq boards (do not have a mdm9607 right now) and
>         issue does not look any obvious.
>        can you please give the debug logs that you did for the above stage by stage ?

Thanks for stepping up, it is really appreciated, good luck both for
the debugging.

Thanks,
Miquèl