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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b87959c9763sm1003138566b.35.2026.01.19.01.57.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Jan 2026 01:57:30 -0800 (PST) Message-ID: <051f401a-a3e0-4d09-8a21-e6e323aecece@oss.qualcomm.com> Date: Mon, 19 Jan 2026 10:57:28 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/4] drm/msm/mdss: correct HBB programmed on UBWC 5.x and 6.x devices To: Dmitry Baryshkov , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Konrad Dybcio , Vinod Koul , Stephan Gerhold Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Val Packett References: <20260119-msm-ubwc-fixes-v3-0-34aaa672c829@oss.qualcomm.com> <20260119-msm-ubwc-fixes-v3-1-34aaa672c829@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260119-msm-ubwc-fixes-v3-1-34aaa672c829@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=SNhPlevH c=1 sm=1 tr=0 ts=696e000c cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=FnLLt5dnLMIZ3HHg8ZoA:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE5MDA3OSBTYWx0ZWRfX04YBsv1SRmYb W5L7GjGXw+RHZNb5p0KsNxefzInBLmxcrXhQbc1EFoy2wu700ugsefTohx1ZnsrOFCHUnmUoIvc F0Wvbm9NpUu/fdTR1oMAy8DfTerJCvVvd2mAJ5vZWk+Bh64o5BEj3YfjSbMGDYw1AIqjwEkJNTI FkHHGG9hZ1f+KYps8R+Fg3HxS+k7Es6qEs2mKgcn+VPJPw7I42gwvShGoYrkIrTgeW2V+Q6fZw0 9g1aCJLl0+NoEURrb+x4aoYDIn0qO8wxuZYKtc4j204wXGkICrM/hctllnT9r0Mh1QJdLuj7LRj fFIFzmz8rG8hzLp0KSagwAd9u8g9aNRxt9dfa0F8Q1GcNpmKdfmdehA6O/Ktb2mt0M/idJOAjgK VJ6Scpvr9xrHpEDZszxq+Hm5iUtnQAZMB6yNyyxrVxDCIq+9J36vTqcaKEwn86CnTccXR1z+zAR pGtF0Ue7c/HV9qJAolw== X-Proofpoint-ORIG-GUID: ahi0IDI8n9fYmc4JvDBYStchI6znf76j X-Proofpoint-GUID: ahi0IDI8n9fYmc4JvDBYStchI6znf76j X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-19_02,2026-01-19_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 bulkscore=0 spamscore=0 adultscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601190079 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 # x1e80100-dell-latitude-7455 > Signed-off-by: Dmitry Baryshkov > --- Reviewed-by: Konrad Dybcio Konrad