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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9b1f29744esm110069366b.130.2024.10.25.14.53.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Oct 2024 14:53:07 -0700 (PDT) Message-ID: <2cf6ca44-3a7c-4561-91db-5493414d61ec@oss.qualcomm.com> Date: Fri, 25 Oct 2024 23:53:04 +0200 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] arm64: dts: qcom: sm8550: correct MDSS interconnects To: Dmitry Baryshkov , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong Cc: Abhinav Kumar , Rob Clark , Marijn Suijten , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, freedreno@lists.freedesktop.org, stable@kernel.org References: <20241008-fix-sm8x50-mdp-icc-v1-0-77ffd361b8de@linaro.org> <20241008-fix-sm8x50-mdp-icc-v1-1-77ffd361b8de@linaro.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20241008-fix-sm8x50-mdp-icc-v1-1-77ffd361b8de@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: e4kykH62xu_qbnU93eJd2wF3xOxd4STs X-Proofpoint-GUID: e4kykH62xu_qbnU93eJd2wF3xOxd4STs X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=746 priorityscore=1501 impostorscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 spamscore=0 malwarescore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410250169 On 8.10.2024 1:36 AM, Dmitry Baryshkov wrote: > SM8550 lists two interconnects for the display subsystem, mdp0-mem > (between MDP and LLCC) and mdp1-mem (between LLCC and EBI, memory). > The second interconnect is a misuse. mdpN-mem paths should be used for > several outboud MDP interconnects rather than the path between LLCC and > memory. This kind of misuse can result in bandwidth underflows, possibly > degradating picture quality as the required memory bandwidth is divided degrading > between all mdpN-mem paths (and LLCC-EBI should not be a part of such > division). I think it's just for power savings, but maybe Abhinav would know better Konrad