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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b96e07dc7aesm354874866b.35.2026.03.10.06.32.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Mar 2026 06:32:14 -0700 (PDT) Message-ID: Date: Tue, 10 Mar 2026 14:32:11 +0100 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 v5 3/3] arm64: dts: qcom: sm8750: Add GPU clock & IOMMU nodes To: Pengyu Luo , taniya.das@oss.qualcomm.com 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: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=c9WmgB9l c=1 sm=1 tr=0 ts=69b01d60 cx=c_pps a=Z3eh007fzM5o9awBa1HkYQ==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=wQPFRYplTptn7ZEjZC4A:9 a=QEXdDO2ut3YA:10 a=eBU8X_Hb5SQ8N-bgNfv4:22 X-Proofpoint-ORIG-GUID: GYCf9o78-bjQkJ58UMyvzI4GraI__cvE X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEwMDExNyBTYWx0ZWRfX9JQAoIS/ojKL a0xE7Lfy5LaaQjHrsyIJnvvvM65SK5zohvrk1iRQXRfpNJynt1cxKSqtZB4Id9TbslkMSynsdPV Isx7jpKHGTFcVqlFKkmF7b0uVxdRKAM++O1guzSl6vVgOuM0EtGAP3Jp9kNkJOihu+rQqxJtX5H Zv5d0llYXdt+T8SJeTsc1YEejrVGWRo95m/yvqi4lwGutEjOJbTZNdM8UlnxNlR6wU6i29DqWzh 5hWclQE0p+Iq3prLiDCyD502FWPYk/gyjgUY2qOEvpPpn5ZTUHaQxWLYGOJlJ8Jzf/hwE38MxvX uIJ1MyfUynGeXe7ZDfeFf/Xi2lGME8bFlAMx7UXbs6+L9ordziz9vLes6TH/j3b13/fnmW4yz2O d9hY9xSqPYN+egXIz9pq/Dd3tHZjV7AS3cctTRdj0Yn5EBNTCQYviSPZKFCnv1QiI+vEYNxDeR9 fC7V7tCIWD2ak5a/nhA== X-Proofpoint-GUID: GYCf9o78-bjQkJ58UMyvzI4GraI__cvE 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_02,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 spamscore=0 clxscore=1015 impostorscore=0 phishscore=0 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603100117 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. Konrad