linux-kernel - Re: [PATCH v3 2/3] soc: qcom: ubwc: Get HBB from SMEM

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Message-ID: <you4xijwc5g4ngcnhxm4ecn7opexnsdfayvd5wiiqpl7734r7w@bdkpjqmlzxre>
Date: Thu, 8 Jan 2026 16:45:49 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konradybcio@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Kees Cook <kees@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Akhil P Oommen <akhilpo@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-hardening@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v3 2/3] soc: qcom: ubwc: Get HBB from SMEM

On Thu, Jan 08, 2026 at 03:21:51PM +0100, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> To make sure the correct settings for a given DRAM configuration get
> applied, attempt to retrieve that data from SMEM (which happens to be
> what the BSP kernel does, albeit with through convoluted means of the
> bootloader altering the DT with this data).
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> ---
> I'm not sure about this approach - perhaps a global variable storing
> the selected config, which would then be non-const would be better?

I'd prefer if const data was const, split HBB to a separate API.


-- 
With best wishes
Dmitry