linux-kernel - Re: [PATCH v3 1/4] drm/msm/mdss: correct HBB programmed on UBWC 5.x and 6.x devices

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Message-ID: <051f401a-a3e0-4d09-8a21-e6e323aecece@oss.qualcomm.com>
Date: Mon, 19 Jan 2026 10:57:28 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov
 <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Konrad Dybcio <konradybcio@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Val Packett <val@...kett.cool>
Subject: Re: [PATCH v3 1/4] drm/msm/mdss: correct HBB programmed on UBWC 5.x
 and 6.x devices

On 1/19/26 9:17 AM, Dmitry Baryshkov wrote:
> As in the previous generations, on UBWC 5.x and 6.x devices the Highest
> Bank Bit value should be programmed into the hardware with the offset of
> -13.  Correct the value written into the register to prevent
> unpredictable results.
> 
> Fixes: 227d4ce0b09e ("drm/msm: Offset MDSS HBB value by 13")
> Tested-by: Val Packett <val@...kett.cool> # x1e80100-dell-latitude-7455
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad