linux-kernel - Re: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1

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Message-ID: <12eea0497bc366365f2835b30fd42ccabba44d99.camel@mediatek.com>
Date:   Fri, 3 Nov 2023 02:19:12 +0000
From:   Peter Wang (王信友) 
        <peter.wang@...iatek.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "bvanassche@....org" <bvanassche@....org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "quic_asutoshd@...cinc.com" <quic_asutoshd@...cinc.com>,
        Naomi Chu (朱詠田) <Naomi.Chu@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "mani@...nel.org" <mani@...nel.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     Powen Kao (高伯文) <Powen.Kao@...iatek.com>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        Casper Li (李中榮) <casper.li@...iatek.com>,
        CC Chou (周志杰) <cc.chou@...iatek.com>,
        Alice Chao (趙珮均) 
        <Alice.Chao@...iatek.com>,
        Chun-Hung Wu (巫駿宏) 
        <Chun-hung.Wu@...iatek.com>,
        Eddie Huang (黃智傑) 
        <eddie.huang@...iatek.com>
Subject: Re: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to
 DeviceQueueDepth + 1

On Thu, 2023-11-02 at 13:24 +0800, naomi.chu@...iatek.com wrote:
> From: Naomi Chu <naomi.chu@...iatek.com>
> 
> The UFSHCI 4.0 specification mandates that there should always be at
> least one empty slot in each queue for distinguishing between full
> and
> empty states. Enlarge the `hwq->max_entries` to `DeviceQueueDepth +1`
> to allow UFSHCI 4.0 controllers to fully utilize MCQ queue slots.
> 
> 

Reviewed-by: Peter Wang <peter.wang@...iatek.com>