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Tue, 07 Jul 2026 06:07:36 -0700 (PDT) X-Received: by 2002:a05:6102:290c:b0:737:1ca6:84d1 with SMTP id ada2fe7eead31-744b7c5e3e3mr2502943137.24.1783429653657; Tue, 07 Jul 2026 06:07:33 -0700 (PDT) Received: from [10.219.56.198] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aed137705dsm3703700e87.32.2026.07.07.06.07.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jul 2026 06:07:32 -0700 (PDT) Message-ID: <807f145d-88d3-460a-9862-b63fe2a52cf7@oss.qualcomm.com> Date: Tue, 7 Jul 2026 18:37:24 +0530 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 3/6] arm64: dts: qcom: kodiak: Add GEM_NOC interconnect for adreno SMMU To: Dmitry Baryshkov Cc: Will Deacon , Robin Murphy , Joerg Roedel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Rob Clark , linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20260706-smmu_interconnect_addition-v3-0-afdca0125a65@oss.qualcomm.com> <20260706-smmu_interconnect_addition-v3-3-afdca0125a65@oss.qualcomm.com> Content-Language: en-US From: Bibek Kumar Patro In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA3MDEyNyBTYWx0ZWRfX5TzVfTA//9xH NSSiwMWZTQkvKSUKIni2e/7xG2EDfQexfXo2B9Qb+Ee61MUNHeSsVRp4/KJt08H5ThYe0gJP/e9 tTy/BqQXW2hp/CJUjed+TxCAlDL33Yk= X-Proofpoint-GUID: AeqeESIMlbBysSbJ8DTi-EhOFR80FhJE X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA3MDEyNyBTYWx0ZWRfX2lvdmwlysbPh /PjU3vBw2gS0vIeqsVqY3QHu+fMlbNW5qk+udRaz86fxNko9wd1F9MXVQ7yGaO/+YUkUdw4yZot YpV9l8iyHbnvXR0WdVj4l1lPzbSOH0yUO1QIzjPuNckzkDWxx7dOLvh+s8LHpokLqxsZKwLmDaZ b0Ogna7vKwRKWT2pT9pL96OOLd5YN9sSHM+hNqUc7oVTMDIpA808gMcWUlyTBc3GzCaeZR/5RaF S75WGiVvHQbep9PiQqPGDnbwGaF6DLzW8Yj3A0T6LhlOVfGkClv1kce1EfV4SgBq7UoegqwPfd5 Lo0LSrJUE+WRvSzZX3BGqGwql3gfcs/QvFgBJqfLaQBMQGPh8dh5KV+nvHX+dDmkElXFNrbpF+8 5GYexavnyXTLETDcLQoRjVvNv46WGRJZQ+xQEIbp1F1LuuOB1RQMdbKYAsLzOAYdEK/pxE18JcW ywow32SYYJZwOVTpdUQ== X-Proofpoint-ORIG-GUID: AeqeESIMlbBysSbJ8DTi-EhOFR80FhJE X-Authority-Analysis: v=2.4 cv=bPQm5v+Z c=1 sm=1 tr=0 ts=6a4cfa19 cx=c_pps a=DUEm7b3gzWu7BqY5nP7+9g==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=-8xGkPWzXzLllqT0I9MA:9 a=QEXdDO2ut3YA:10 a=-aSRE8QhW-JAV6biHavz:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-07_03,2026-07-06_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 spamscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607070127 On 7/6/2026 11:12 PM, Dmitry Baryshkov wrote: > On Mon, Jul 06, 2026 at 10:26:36PM +0530, Bibek Kumar Patro wrote: >> On Kodiak platforms, the Adreno SMMU requires a bandwidth vote on >> the GEM_NOC path (MASTER_GPU_TCU -> SLAVE_EBI1) before its registers >> are accessible. Without this vote, the SMMU may become unreachable, >> leading to intermittent probe failures and runtime issues. >> >> Add the required interconnect to ensure reliable register access. >> >> Signed-off-by: Bibek Kumar Patro >> --- >> arch/arm64/boot/dts/qcom/kodiak.dtsi | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/qcom/kodiak.dtsi b/arch/arm64/boot/dts/qcom/kodiak.dtsi >> index 90e50c245c0c..721526f023dd 100644 >> --- a/arch/arm64/boot/dts/qcom/kodiak.dtsi >> +++ b/arch/arm64/boot/dts/qcom/kodiak.dtsi >> @@ -3389,6 +3389,8 @@ adreno_smmu: iommu@3da0000 { >> >> power-domains = <&gpucc GPU_CC_CX_GDSC>; >> dma-coherent; >> + interconnects = <&gem_noc MASTER_GPU_TCU QCOM_ICC_TAG_ALWAYS >> + &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>; > > Why is it ALWAYS? Would it be better to declare it as ACTIVE_ONLY and Added QCOM_ICC_TAG_ALWAYS, to hold the vote in SLEEP bucket as well preventing gem_noc going to sleep when icc_set_bw is being called. > then drop the extra suspend/resume play? Not sure if I understood it correctly. Did you mean the extra suspend/resume play in arm_smmu_runtime_suspend or in arm_smmu_device_shutdown() path? Thanks & regards, Bibek > >> }; >> >> gfx_0_tbu: tbu@3dd9000 { >> >> -- >> 2.34.1 >> >