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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b976cdb1d20sm40152166b.41.2026.03.13.05.02.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Mar 2026 05:02:39 -0700 (PDT) Message-ID: <0811deda-3763-4092-a4b4-8977199ae4f8@oss.qualcomm.com> Date: Fri, 13 Mar 2026 13:02:35 +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 Cc: taniya.das@oss.qualcomm.com, 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: 8bit X-Proofpoint-GUID: 3xKe5gXap0wLazwU8SrTCgvN09wxheiE X-Authority-Analysis: v=2.4 cv=IIIPywvG c=1 sm=1 tr=0 ts=69b3fce1 cx=c_pps a=nSjmGuzVYOmhOUYzIAhsAg==:117 a=FpWmc02/iXfjRdCD7H54yg==: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=JfrnYn6hAAAA:8 a=A4iZcLwekUeCbZ0gfxgA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=1zu1i0D7hVQfj8NKfPKu:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEzMDA5NSBTYWx0ZWRfXwypSwma9dn+M TvKZFMR0qa9FEfiLAcakWanokTO8osWYun6jB8qk9P1on4WlOKExISFZMA35qaiGGhPFDhfxgnb KNxdJpeB4o9LLzG3H+xzpNO3QzNApduMrBki9m/L3sQpFmIZ2wY/RcWK6C2FqpHP+ZqlcltZzXz Wt/lBrY9D4FNiQE28gMP9kfqlZdMb321qSpXeRzhJd12ZTYV32K64FoZzIimNZp09Nvp9/nYnlP IuLMEjutqaaO/wts03Mii24yVPuXm9rdQByWTzK+CVY5gINEC7R0kAkDfHJxlV6vFFZtrQRzswO OU1HLxueTg4MEaT8UQGowULLAOLfJS3yYmIpW2NTpSPAq6vqyk5IUcxyaVFR0ku0Qm5QM/E59eK Plb5bb7Xx+BWjkQlQobIu7c/LzoyqJhVFAge4uCTCdWbZpalRqP05iVyoFwLZlOKFmCwwCWET3n JUyRFfPt5lq5dxYjfQg== X-Proofpoint-ORIG-GUID: 3xKe5gXap0wLazwU8SrTCgvN09wxheiE 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=2026-03-13_02,2026-03-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 impostorscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603130095 On 3/12/26 7:40 AM, Pengyu Luo wrote: > On Tue, Mar 10, 2026 at 9:32 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 >> > > It seems to be harmless. In the downstream, they are always zero too. > TB322FC:/ # devmem 0x3d68024 > 0x00000000 > TB322FC:/ # devmem 0x3d68028 > 0x00000000 > > In [1], the commit log mentioned > The GX GDSC is modelled to aid the GMU in powering down the GPU in the > event that the GPU crashes. > >> 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. >> > > Indeed. Chances are that I can't enable gpu. I must reboot again and again to > match the sequence by luck, then I can enable it[2], and I must > disable register protection.(I just noticed the hack from here[3]) > >> I heard it's in the works though, so you may be better off waiting a bit. >> > > Glad to hear that. I am looking forward to it. > > Slightly off-topic, do you know if anyone is working on wcn786x/wcn7880, > sm8750 QRD SKU2 V8 Power Grid uses this. I don't know. You can try asking on ath12k@lists.infradead.org Konrad