linux-kernel - Re: [PATCH] scsi: ufs: core: Fix mcq mac configuration

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Message-ID: <5ac69cde-24d6-4d31-a1bb-10e91dd289ce@quicinc.com>
Date: Wed, 21 Feb 2024 17:07:06 +0800
From: Can Guo <quic_cang@...cinc.com>
To: Rohit Ner <rohitner@...gle.com>, Bean Huo <beanhuo@...ron.com>,
        "Bart Van
 Assche" <bvanassche@....org>,
        "Martin K. Petersen"
	<martin.petersen@...cle.com>
CC: Avri Altman <avri.altman@....com>,
        "Bao D. Nguyen"
	<quic_nguyenb@...cinc.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: ufs: core: Fix mcq mac configuration



On 2/20/2024 5:56 PM, Rohit Ner wrote:
> As per JEDEC Standard No. 223E Section 5.9.2,
> the max # active commands value programmed by the host sw
> in MCQConfig.MAC should be one less than the actual value.
> 
> Signed-off-by: Rohit Ner <rohitner@...gle.com>
> ---
>   drivers/ufs/core/ufs-mcq.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 0787456c2b89..c873fd823942 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -94,7 +94,7 @@ void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds)
>   
>   	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
>   	val &= ~MCQ_CFG_MAC_MASK;
> -	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds);
> +	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds - 1);
>   	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
>   }
>   EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);

Reviewed-by: Can Guo <quic_cang@...cinc.com>