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

Sricharan Ramabadhran
2022-01-28T04:25:11Z

Hi Miquel,

On 1/26/2022 4:12 PM, Miquel Raynal wrote:
> Hi Mani,
>
> mani@kernel.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@bootlin.com wrote on Fri, 14 Jan 2022 08:27:18 +0100:
>>>
>>>> Hi Konrad,
>>>>
>>>> konrad.dybcio@somainline.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@somainline.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.

Regards,
Sricharan