linux-kernel - Re: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

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Date:   Mon, 31 Oct 2022 12:34:19 -0700
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     Avri Altman <Avri.Altman@....com>
CC:     Bart Van Assche <bvanassche@....org>,
        "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
        "quic_xiaosenh@...cinc.com" <quic_xiaosenh@...cinc.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "eddie.huang@...iatek.com" <eddie.huang@...iatek.com>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        "mani@...nel.org" <mani@...nel.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "quic_richardp@...cinc.com" <quic_richardp@...cinc.com>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth

On Sun, Oct 30 2022 at 04:43 -0700, Avri Altman wrote:
>> On 10/20/22 11:03, Asutosh Das wrote:
>> > +u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba)

[...]

>> > +     qd = min_t(u32, mac, hba->dev_info.bqueuedepth);
>> > +     if (!qd)
>> > +             qd = mac;
>Isn't if mcq is supported bqueuedepth can't be zero?
>The device must implements the shared queueing architecture.
>
Ah well, there's a Note mentioned in the UFS 4.0 spec (#7021) which kind of
confused me. I will remove this check if it can't be 0.

-asd
>