linux-kernel - Re: [PATCH v1 2/2] scsi: ufs: qcom: Update the UIC Command Timeout

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Message-ID: <60cd9300-d022-65a2-2804-1539a648b3a4@quicinc.com>
Date: Wed, 22 May 2024 22:34:14 -0700
From: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To: Bart Van Assche <bvanassche@....org>, <quic_cang@...cinc.com>,
        <quic_nitirawa@...cinc.com>, <avri.altman@....com>,
        <beanhuo@...ron.com>, <adrian.hunter@...el.com>,
        <martin.petersen@...cle.com>
CC: <linux-scsi@...r.kernel.org>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam
	<manivannan.sadhasivam@...aro.org>,
        "James E.J. Bottomley"
	<jejb@...ux.ibm.com>,
        "open list:ARM/QUALCOMM SUPPORT"
	<linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] scsi: ufs: qcom: Update the UIC Command Timeout

On 5/22/2024 2:01 PM, Bart Van Assche wrote:
> On 5/22/24 13:56, Bao D. Nguyen wrote:
>> On 5/22/2024 11:18 AM, Bart Van Assche wrote:
>>> Since the described issue is only encountered during development, why to
>>> modify the UIC command timeout unconditionally?
>>
>> The vendors can enjoy the default 500ms UIC timeout if they prefer.
>> As long as they don't write to hba->uic_cmd_timeout in the vendor's 
>> initialization routine, the default value of 500ms will be used.
> 
> Since this issue is not vendor specific, I think it would be better to
> modify the UFSHCI core driver only. Has it been considered to introduce a
> kernel module parameter for setting the UIC command timeout instead of the
> approach of this patch? As you probably know there are multiple mechanisms
> for specifying kernel module parameters, e.g. the bootargs parameter in the
> device tree.

The proposal here uses similar implementation as the auto hibern8 timer 
(hba->ahit). The ahit mechanism has been working well and stable, so I 
thought why not keep using it? Let see if other members have any 
comments about kernel module parameter/bootargs suggestion.

Thanks, Bao

> 
> Thanks,
> 
> Bart.
>