linux-kernel - Re: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

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Message-ID: <14a5925b-df2b-3f84-ed99-b4157c0a1b21@acm.org>
Date:   Thu, 27 Oct 2022 14:09:50 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Asutosh Das <quic_asutoshd@...cinc.com>, quic_cang@...cinc.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org
Cc:     quic_nguyenb@...cinc.com, quic_xiaosenh@...cinc.com,
        stanley.chu@...iatek.com, eddie.huang@...iatek.com,
        daejun7.park@...sung.com, avri.altman@....com, mani@...nel.org,
        beanhuo@...ron.com, quic_richardp@...cinc.com,
        linux-arm-msm@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue
 capability

On 10/20/22 11:03, Asutosh Das wrote:
> +
> +	/*
> +	 * This capability allows the host controller driver to turn on/off
> +	 * MCQ mode. MCQ mode may be used to increase performance.
> +	 */
> +	UFSHCD_CAP_MCQ_EN				= 1 << 12,
>   };

I prefer that the above flag would only be introduced after a need 
appears to disable MCQ, e.g. discovery of a host controller that is too 
broken to enable MCQ.

Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users 
have a way to disable MCQ, e.g. via a kernel module parameter?

Thanks,

Bart.