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

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To: naomi.chu@xxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-mediatek@xxxxxxxxxxxxxxxxxxx, Alim Akhtar <alim.akhtar@xxxxxxxxxxx>, Avri Altman <avri.altman@xxxxxxx>, "James E.J. Bottomley" <jejb@xxxxxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Matthias Brugger <matthias.bgg@xxxxxxxxx>, AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>, Manivannan Sadhasivam <mani@xxxxxxxxxx>, Asutosh Das <quic_asutoshd@xxxxxxxxxxx>, Can Guo <quic_cang@xxxxxxxxxxx>
Subject: Re: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
From: Bart Van Assche <bvanassche@xxxxxxx>
Date: Thu, 2 Nov 2023 12:16:15 -0700
Cc: wsd_upstream@xxxxxxxxxxxx, peter.wang@xxxxxxxxxxxx, casper.li@xxxxxxxxxxxx, powen.kao@xxxxxxxxxxxx, alice.chao@xxxxxxxxxxxx, chun-hung.wu@xxxxxxxxxxxx, cc.chou@xxxxxxxxxxxx, eddie.huang@xxxxxxxxxxxx
In-reply-to: <20231102052426.12006-2-naomi.chu@mediatek.com>
User-agent: Mozilla Thunderbird

On 11/1/23 22:24, naomi.chu@xxxxxxxxxxxx wrote:

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: Bart Van Assche <bvanassche@xxxxxxx>

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References:
- [PATCH v3 0/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
  - From: naomi.chu
- [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
  - From: naomi.chu

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