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Tue, 10 Mar 2026 22:03:16 -0700 (PDT) X-Received: by 2002:a17:903:2f81:b0:2ae:5745:f0e9 with SMTP id d9443c01a7336-2aeae76fcf8mr14504805ad.3.1773205396085; Tue, 10 Mar 2026 22:03:16 -0700 (PDT) Received: from [10.217.217.147] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2aeae34de7bsm12095585ad.53.2026.03.10.22.03.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Mar 2026 22:03:15 -0700 (PDT) Message-ID: Date: Wed, 11 Mar 2026 10:33:09 +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 v5 3/3] arm64: dts: qcom: sm8750: Add GPU clock & IOMMU nodes To: Konrad Dybcio , Pengyu Luo Cc: abel.vesa@oss.qualcomm.com, ajit.pandey@oss.qualcomm.com, Bjorn Andersson , Conor Dooley , devicetree@vger.kernel.org, imran.shaik@oss.qualcomm.com, jagadeesh.kona@oss.qualcomm.com, Konrad Dybcio , Krzysztof Kozlowski , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Turquette , Rob Herring , Stephen Boyd References: Content-Language: en-US From: Taniya Das In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=YOeSCBGx c=1 sm=1 tr=0 ts=69b0f795 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=4HF9s9dolvseeuFZ7A0A:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-ORIG-GUID: q9We9Xoa8hcnwn6tk1srgkG37c9BghBN X-Proofpoint-GUID: q9We9Xoa8hcnwn6tk1srgkG37c9BghBN X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzExMDA0MCBTYWx0ZWRfX8uauAielXzid ZVpvW6t848pAUjr8KrGfPV3dyhpnqi55kpwOChBaEerlGP2KYlUqloIfQBnJReTmkyiurdAK0bS vWTn4XQp30vkglxbSTkRBBEykRKbKQiBv9E/rnHhV9ZcOYhRrElqKae4konUWt5JYrMMUNJG5Un zvJRVDiXN90mTtxatPwDHUE+4jjLnKwZEuUt75untFgKhnZIlMn091uVFBisUJhgfvyrvApQEf8 cdaKKaQQRrxjLqVUMYoRovuprcyQRrcwVSgdY7YPe53Lup9d6fnF/MSiVN/jj+LhdbttKwlrW4Y 65Mx8ofxzYN5CrIlNzmDXQ2HprmvnmpeV9bCyNh32z7cNpuObdGP2Jg3mUUpeqiA5B6Jv5l102O Z5hkwzKWUu5ugT3aU0+wkH5EBijFtm08HyiVDlAzklUjjWh+U1RLOrWgCJtaFC+/ccyqJjFLmlY gsiA2j0uk6q2JpzMrvg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-10_05,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 spamscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 malwarescore=0 phishscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603110040 On 3/10/2026 7:02 PM, Konrad Dybcio wrote: > On 3/9/26 11:27 AM, Pengyu Luo wrote: >> On Thu, Mar 5, 2026 6:40 PM Taniya Das wrote: >>> From: Konrad Dybcio >>> >>> Add the GPU_CC and GX_CC (brand new! as far as we're concerned, this >>> is simply a separate block housing the GX GDSC) nodes, required to >>> power up the graphics-related hardware. >>> >>> Make use of it by enabling the associated IOMMU as well. The GPU itself >>> needs some more work and will be enabled later. >>> >>> Reviewed-by: Abel Vesa >>> Signed-off-by: Konrad Dybcio >>> Co-developed-by: Taniya Das >>> Signed-off-by: Taniya Das >>> --- >>> >> >> Hi Taniya and Konrad, GX GDSC stuck at 'on' on my device >> the raw register values are >> >> 0x3d68024: 0x00000000 >> 0x3d68028: 0x00000000 > > These likely indicate that some clock or voltage rail is not accessible > at the very moment you're reading them back > > GPU support for 8750 is not yet upstream (and A830 is somewhat different > vs the supported A840) - there may be something wrong in that sequence. > > I heard it's in the works though, so you may be better off waiting a bit. > I am checking internally if any required clock is getting turned off and causing this. -- Thanks, Taniya Das