linux-kernel - Re: [PATCH v3] i2c: i2c-qcom-geni: Parse Error correctly in i2c GSI mode

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Message-ID: <cmtru4nvoab6g5emp2yrxnvfpvtrcsuna6dqsyewpagg3qmkau@r2zoj6vgslet>
Date: Thu, 7 Mar 2024 23:58:09 +0100
From: Andi Shyti <andi.shyti@...nel.org>
To: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
Cc: konrad.dybcio@...aro.org, andersson@...nel.org, vkoul@...nel.org, 
	wsa@...nel.org, linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org, quic_vdadhani@...cinc.com
Subject: Re: [PATCH v3] i2c: i2c-qcom-geni: Parse Error correctly in i2c GSI
 mode

Hi Mukesh,

On Fri, Mar 08, 2024 at 02:25:39AM +0530, Mukesh Kumar Savaliya wrote:
> I2C driver currently reports "DMA txn failed" error even though it's
> NACK OR BUS_PROTO OR ARB_LOST. Detect NACK error when no device ACKs
> on the bus instead of generic transfer failure which doesn't give any
> specific clue.
> 
> Make Changes inside i2c driver callback handler function
> i2c_gpi_cb_result() to parse these errors and make sure GSI driver
> stores the error status during error interrupt.

funny note: this is half "imperative mood" :-)

A real imperative would be "Pares the error inside
i2c_gpi_cb_result()... blah blah blah". No need to resend.

> Fixes: d8703554f4de ("i2c: qcom-geni: Add support for GPI DMA")

I still don't understand what's the fix here. You are making a
generic DMA error to be more specific... where is the bug? What
exactly is broken now?

Besides, keep in mind, that commits with fixes tags get
backported to older kernels (this one dates back to 5.18) and you
should also Cc the stable mailing list:

Cc: <stable@...r.kernel.org> # v5.18+

Thanks,
Andi