linux-kernel - Re: [PATCH 2/6] scsi: ufs: ufs-qcom: Add support for UFS device version detection

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Message-ID: <6055cd57-4de7-4b7e-a4f3-68a7de1aef28@linaro.org>
Date:   Mon, 11 Sep 2023 11:17:37 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Can Guo <quic_cang@...cinc.com>, mani@...nel.org,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "open list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER..." 
        <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] scsi: ufs: ufs-qcom: Add support for UFS device
 version detection

On 11.09.2023 07:59, Can Guo wrote:
> From: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
> 
> Retrieve UFS device version from UFS host controller's spare register
> which is populated by bootloader, and use the UFS device version together
> with host controller's HW version to decide the proper power modes which
> should be used to configure the UFS PHY.
That sounds a bit fishy.. is there no bootloader-independent
solution to that? Can't we bring in the code that the bootloader
uses to determine these values?

Konrad