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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: 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: 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-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEwMDExNyBTYWx0ZWRfX0hZBI4/zuwId ZomYrLhU6YimAPZBZVFnXhjrqKqzehEr0GY+DNl7Bl22KCiMPgb+A5jw2Dg6/Pma4kUewi0itEi UwOCPW0E4IpIMzN5yafhDIiXZxiCKW4OPnxISRpkn1V8J+YvnisuV3hELLhtXs3K5VjwIIHtCBT RRCMi2eMf8Si3R/JUv2X1W7HUlpKbKUf7m5dsggZo7mBLNHe3usdc9vQsXLehLcwdthcIRlv4aR KxpQHhff5350Qjux2d7HkzfXh1K69huEJrZIjeDrZD5ht4UdluW14vRXjOuP6bmKW2LpYT+vRXX b2WXai3H2SpiYm6mFoEFXjvzPhKF+z482qb7rWyqdE9bkuVwhA6voTOP7DYiBafM126x83vSvF1 iy1tX673UPkZRZmAOgr1nl8hHhY8x0OQV3+7SYhmhrw64t/DI0ZII02Wq4rjLCHmeJ2EYGO0Mrz +f45ovISupVMtlqCYWQ== X-Proofpoint-ORIG-GUID: w45RaqZ9Lj51Ejd2FqycIyKWA1pKGG1X X-Proofpoint-GUID: w45RaqZ9Lj51Ejd2FqycIyKWA1pKGG1X X-Authority-Analysis: v=2.4 cv=b+W/I9Gx c=1 sm=1 tr=0 ts=69b01d60 cx=c_pps a=CWtnpBpaoqyeOyNyJ5EW7Q==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=EUspDBNiAAAA:8 a=wQPFRYplTptn7ZEjZC4A:9 a=QEXdDO2ut3YA:10 a=vh23qwtRXIYOdz9xvnmn:22 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 bulkscore=0 adultscore=0 suspectscore=0 phishscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 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