linux-kernel - Re: [PATCH v1 01/16] ufs: core: Probe for ext

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Date:   Fri, 30 Sep 2022 11:23:13 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Asutosh Das <quic_asutoshd@...cinc.com>, mani@...nel.org,
        quic_nguyenb@...cinc.com, quic_xiaosenh@...cinc.com,
        quic_cang@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com, quic_richardp@...cinc.com,
        stanley.chu@...iatek.com, adrian.hunter@...el.com,
        avri.altman@....com, beanhuo@...ron.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 01/16] ufs: core: Probe for ext_iid support

On 9/22/22 18:05, Asutosh Das wrote:
> +	hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);

What value is reported when reading the REG_MCQCAP register on an UFSHCI 
3.0 controller? -1 or 0?

> +	hba->ext_iid_sup = (hba->mcq_capabilities & MASK_EXT_IID_SUPPORT) >>
> +		EXT_IID_CAP_SHIFT;

[ ... ]

> +	if (dev_info->wspecversion < 0x400)
> +		goto out;

Isn't this version check superfluous? Only UFSHCI 4.0 controllers should 
support the extended IID feature.

> +	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);

The above change introduces a third instance of this code. Please 
introduce a helper function that does something like the following and 
replace the above line with a call to that helper function:

	if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
		return 0;

	return get_unaligned_be32(desc_buf +
				 DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);

> +out:
> +	dev_info->b_ext_iid_en = !!ext_iid_en;

Please remove "!!". This conversion happens implicitly when assigning to 
a boolean variable.

Thanks,

Bart.