linux-kernel - Re: [RESENT PATCH RFC v3 1/5] scsi; ufs: add device descriptor for Host Performance Booster

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Date:   Thu, 7 May 2020 17:59:52 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     huobean@...il.com, alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, tomas.winkler@...el.com, cang@...eaurora.org,
        rdunlap@...radead.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        hch@...radead.org
Subject: Re: [RESENT PATCH RFC v3 1/5] scsi; ufs: add device descriptor for
 Host Performance Booster

On 2020-05-04 07:20, huobean@...il.com wrote:
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 698e8d20b4ba..de13d2333f1f 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6627,6 +6627,17 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
>  		goto out;
>  	}
>  
> +	if (desc_buf[DEVICE_DESC_PARAM_UFS_FEAT] & 0x80) {
> +		hba->dev_info.hpb_control_mode =
> +			desc_buf[DEVICE_DESC_PARAM_HPB_CTRL_MODE];
> +		hba->dev_info.hpb_ver =
> +			(u16) (desc_buf[DEVICE_DESC_PARAM_HPB_VER] << 8) |
> +			desc_buf[DEVICE_DESC_PARAM_HPB_VER + 1];
> +		dev_info(hba->dev, "HPB Version: 0x%2x\n",
> +			 hba->dev_info.hpb_ver);
> +		dev_info(hba->dev, "HPB control mode: %d\n",
> +			 hba->dev_info.hpb_control_mode);
> +	}
>  	/*
>  	 * getting vendor (manufacturerID) and Bank Index in big endian
>  	 * format

Please introduce a symbolic name for the constant 0x80, e.g.
UFS_FEATURE_HPB.

Please use get_unaligned_be16() instead of open-coding it.

Thanks,

Bart.