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Thu, 24 Sep 2026 02:16:12 -0700 (PDT) X-Received: by 2002:a05:620a:4482:b0:934:95d9:85fe with SMTP id af79cd13be357-93c363bb776mr190958885a.3.1790241371449; Thu, 24 Sep 2026 02:16:11 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2aae6d9732sm264583366b.60.2026.09.24.02.16.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Sep 2026 02:16:10 -0700 (PDT) Message-ID: <6f7d4bc6-ca16-4293-938b-0e5b7ddcb44e@oss.qualcomm.com> Date: Thu, 24 Sep 2026 11:16:08 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: nord: add GPI DMA controller nodes To: Bartosz Golaszewski , Mukesh Savaliya Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski , Shawn Guo , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley References: <20260921-nord-gpi-dts-v2-0-4f297c983b94@oss.qualcomm.com> <20260921-nord-gpi-dts-v2-1-4f297c983b94@oss.qualcomm.com> <16f1b504-c414-4072-98d3-49f60d552028@oss.qualcomm.com> <79fc7d1b-98b2-455f-9a3d-d93602bb2bf8@oss.qualcomm.com> <09715ff3-df00-4ba7-8d9d-52b15e8b86df@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: hBHeedDqn5dA-cz9wqZzpeXaGYM86IQr X-Proofpoint-ORIG-GUID: hBHeedDqn5dA-cz9wqZzpeXaGYM86IQr X-Authority-Analysis: v=2.4 cv=QeXzLcbv c=1 sm=1 tr=0 ts=6ab4ea5c cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=OIwW3chDm1YJotNPmsUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI0MDAzOCBTYWx0ZWRfXzao7aj3Plurz 5/suO0Y31oQNOFsQqoVEfSaJCEDefiaLtE0u4+rEQS0VfyfyFHnct8Kbo0E90f3W7Ou80J2sxDK NnARZwDo31AH7Odhlqq5xCHrJF+XAR4= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI0MDAzOCBTYWx0ZWRfXwQPLEXKYYk0K Zq2xNP5c/+RYwfxIIL/T0iUGWCoxqP1x6JVtm6yzQvaYsQo723WTBY/ZNV0kNs1/YZcMsI1aOkB e5NxuplDU5r+z4FWc/gWR6NCUBjCBw11drwmfmSzao5It7Gcea5N7ROBzNWFO/HVfOqJD4ogUwu WdK+8Ois+DSZ/3zJTfP/+ffQQ/Z88eN0dbWZgvr0SwHlDw55BUvbCZ72cF2GXi3pQBXnqvwDdIS AYFIeznnFNV3QhwgQahCTP2IFcVzu9IHb9z5ljbiKwKjio0INi2jYuDRlVZlCa1VZbrjbjINGhm rwtcLFsmGHGg37xEUM6+MSe6Jt3GXGHx55EEmwnE1x28Z9eGshxRV7/QMZG3M2YcyJW7joEvo6m UUW5cQxd5CP5PpOB0qvtFew1VcAzbHyz2WpXBl/Y+Wa0MGY/PcEotTYoNwZE3KguTMz57AcA+zm hOhqruEmZM2prJ9BIuA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-24_02,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 adultscore=0 clxscore=1015 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609240038 On 9/24/26 10:55 AM, Bartosz Golaszewski wrote: > On Thu, Sep 24, 2026 at 10:50 AM Mukesh Savaliya > wrote: >>>>> >>>>> we should be keeping GPI node default enabled similar to common QUPv3 >>>>> wrapper node. >>>>> status = "ok" for all the nodes. >>>>> >>>> >>>> The pattern across Qualcomm platforms seems to disable the GPI DMA nodes at >>>> SoC-level and only enable them at board-level. >>> >>> For no reason - the DMA engines may be reserved through TZ config, >>> but for the past (high) N years that hasn't been the case >>> >> >> There is a reason to reserve this from TZ. Some use cases require GPI to >> be available during early boot, before Linux is up and running, which >> necessitates keeping the GPI instance enabled. >> >> Also, GPII is allocated per SE, while the GPI instance itself is shared >> across all SEs within a QUP. Given that a QUP typically contains eight >> SEs, it is likely that at least one SE will require GPI operation. >> >> For that reason, my preference is to keep the GPI node enabled by >> default. However, if there is a strong preference to make this >> board-specific and enable it only where required, I can work with that >> approach as well. >> >> I think it would be better to align on the expected default behavior >> now, rather than revisiting it later once additional users start >> depending on it. > > If I understood Konrad correctly, he too is in favor of enabling the > GPI nodes. I was about to resend v3 with that changed. Yes please Konrad