Re: [PATCH] mtd: nand: raw: qcom_nandc: Don't clear_bam_transaction on READID

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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@xxxxxxxxxx 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@xxxxxxxxxxx wrote on Fri, 14 Jan 2022 08:27:18 +0100:
Hi Konrad,

konrad.dybcio@xxxxxxxxxxxxxx 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@xxxxxxxxxxxxxx>
---
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 ?

  Regards,
      Sricharan




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