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Tue, 18 Aug 2026 20:27:31 -0700 (PDT) X-Received: by 2002:a17:903:b83:b0:2ca:e5c:7fcf with SMTP id d9443c01a7336-2d5fd5eaca9mr31892105ad.3.1787110050597; Tue, 18 Aug 2026 20:27:30 -0700 (PDT) Received: from [10.64.69.173] ([114.94.8.21]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d5bb49755esm23186825ad.17.2026.08.18.20.27.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Aug 2026 20:27:30 -0700 (PDT) Message-ID: Date: Wed, 19 Aug 2026 11:27:21 +0800 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 1/3] dt-bindings: display: msm: Allow two MDSS power domains To: Konrad Dybcio , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Krishna Manikandan , Abel Vesa , Yuanjie Yang , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260720-msm_gdsc2-v1-0-4687866d6cb0@oss.qualcomm.com> <20260720-msm_gdsc2-v1-1-4687866d6cb0@oss.qualcomm.com> <5341e732-0deb-4d00-9a7c-595e317bf1e8@oss.qualcomm.com> Content-Language: en-US From: Yongxing Mou In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE5MDAyMiBTYWx0ZWRfX4e0kNA6MIbuy 07p4ae9dcG1KcyZd4St3VBPCnOBeOhFJfIlOG3dqgFgYX1uCB1jrDPpOCpeajYUuLuRU4d6uWaj S+22jb1uVxqGR888YVQu2cAvPZjfTmvYdOG8Ra/R3d3Nq38Fjjf2B0S/oi6mRaBmnYt2QjTHbDv 7ZE4pvBmIxL3Tl1ayJIn8YJi2vdW6jAWjzJcPrhS4hHcU2FELLAnCCbv6+gzFBgdBHgAvBTl4z8 XNpWF4+hDsK1BXHy24XluQoiGwN4cjPvDeKtHkl8GXpvrGSNsJCWwnyUMldfZMP7FMUAWZgbnQu rEiVAxYrwJY5inRUg2fEClY5h7xiyf6T7ghteT3hdQt6MhbObGnBUbq/r2UVtV3NJLAeI0MmLGL EG58GkL2BSRtxejE3BWytiKQg7gUXEoh4GBonNIU+zC4+AMOvxTbjncMsx/CCjfhlTplmF1TS4I AaZ0u+GdJrmSj5xIFzg== X-Proofpoint-GUID: CmQBBWikMIEHc0i1y6f7M2ogo5PFzUEW X-Proofpoint-ORIG-GUID: CmQBBWikMIEHc0i1y6f7M2ogo5PFzUEW X-Proofpoint-Spam-Info: AW1haW4tMjYwODE5MDAyMiBTYWx0ZWRfX7Jh0XJjDi/AM oqxeekxLrYs7ClsACJ9dsJ9J1rcBx8DVfgLCqygAf9Orw7u++z/mIHbM4qw8h+kbZnBOAqP6ie0 UEC2kfRmwHyEcvtpJ6OS7PGmNZ/ND3Q= X-Authority-Analysis: v=2.4 cv=Sb7HsPRu c=1 sm=1 tr=0 ts=6a8522a4 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=Uz3yg00KUFJ2y2WijEJ4bw==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=hXMCaxYEdCLwTpMgVTgA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 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=2026-08-19_01,2026-08-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 bulkscore=0 impostorscore=0 adultscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608190022 On 8/17/2026 10:14 PM, Konrad Dybcio wrote: > On 8/17/26 4:13 PM, Konrad Dybcio wrote: >> On 8/13/26 9:44 AM, Yongxing Mou wrote: >>> >>> >>> On 7/20/2026 4:49 PM, Konrad Dybcio wrote: >>>> On 7/20/26 10:43 AM, Yongxing Mou wrote: >>>>> Kaanapali (SM8750) and Glymur use two display power domains. >>>>> CORE_GDSC powers the main display hardware while INT2_GDSC >>>>> powers a subset of SSPP blocks. >>>> >>>> Can they operate independently? Does INT2_GDSC need to be >>>> powered on after CORE_GDSC? >>>> >>> On Kaanapali, my understanding is that CORE_GDSC and INT2_GDSC should generally track the same state, except that INT2_GDSC may be powered down when SSPP1 (VIG2/VIG3/DMA5) is unused. >> >> Is the MDSS any useful if *only* INT2_GDSC is enabled? Can the INT2_GDSC >> be enabled itself if CORE_GDSC is off? > > (I didn't quite know how to parse the list of states you provided in your > reply so I asked again) > > Konrad Sorry, here INT2_GDSC can be on only when CORE_GDSC is on. And power sequence is: Power down sequence: MDSS_INT2 > MDSS_INT > Power up sequence: MDSS_INT > MDSS_INT2