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Mon, 19 Oct 2026 23:08:26 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b3cd39ec18sm2243135a12.16.2026.10.19.23.08.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2026 23:08:25 -0700 (PDT) Message-ID: <74dc9718-9911-4a13-9e10-0c2932007a4a@oss.qualcomm.com> Date: Tue, 20 Oct 2026 08:08:22 +0200 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] regulator: qcom_spmi: don't take a sleeping lock in the SAW IPI To: Dmitry Baryshkov , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Stephan Gerhold , AngeloGioacchino Del Regno , Liam Girdwood , Mark Brown , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Ilia Lin Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev References: <20261019-fix-qcom-saw-v1-0-9c7ba3fc2493@oss.qualcomm.com> <20261019-fix-qcom-saw-v1-3-9c7ba3fc2493@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261019-fix-qcom-saw-v1-3-9c7ba3fc2493@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: OrvyywGi1kgNhCgxtW1saWhIO8dOguzc X-Authority-Analysis: v=2.4 cv=DZOCOftW c=1 sm=1 tr=0 ts=6ad7055b cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=zBMmP5lLP3iSaWE8ja4A:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-ORIG-GUID: OrvyywGi1kgNhCgxtW1saWhIO8dOguzc X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIwMDAyNCBTYWx0ZWRfX53pztKZZe6dr 9AM5JYq3u7DwOHs5TueU2UzGEQg7N442kydBpUrISIEWHtHkE+X3ylOUsJDV+jS/3Z6pEkxVf9a EpkT73R5fQJJbk0ks3G3boRyaVKr2r45A6YFXoPKtZkEa8Mf+9UuUqcp399HMiqwBDK1J0uaQoL BRKHeJpD4a2fUqhKqvduYdMZEYurAp8cQ3VgsNIS/kxt4operoQp+gznh7/DEeBa9TX3uIaCNEr VaPej60xgpkr73bmgYgi9+oG2CAf0fzp5pQHHTiGLbtS+QoShCcTPl86OmVwfcxde9QlWdbi8n9 O3dMcb3PoiC/tyf3VubW1yQK7ouXDVCHUYs7lvC6RlXo3Yt32tAyByNwVfLGRaP3gyWn0jq9ViA p9wCfjA7BMZUnhq4O0fjjxL1boLlTV3Q9WHfeJrt4Z9VYiR/KfqLdzutyLApoN2ZUiBbz+wj6yi gebj+F6DUYyGl6oxGfQ== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIwMDAyNCBTYWx0ZWRfXzF22JhLsj4px KMMWBI9LTEZbZYG4KS6w1iZyL/7vbRLNIJWMvVo0x0OVeZdiVoVX4CH/R9rC/3D5dMdYBy566rU yNTZZbuGxuU1Z10mCLwGIzwV1pXsr04= 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=2026-10-20_01,2026-10-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 phishscore=0 priorityscore=1501 bulkscore=0 adultscore=0 lowpriorityscore=0 spamscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610200024 On 10/19/26 4:39 PM, Dmitry Baryshkov wrote: > The SAW voltage change runs on CPU 0 from an IPI, but it reaches the SAW > registers through the syscon regmap, which is protected by a spinlock_t. > That is a sleeping lock on PREEMPT_RT, and lockdep complains as soon as > VDD_APCC actually changes voltage: The SAW handling barely belongs in that driver to be honest.. but separating it out would make a mess out of sharing the of_node Reviewed-by: Konrad Dybcio Konrad