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Mon, 24 Aug 2026 21:00:59 -0700 (PDT) X-Received: by 2002:a05:6a00:4c13:b0:851:8bde:7873 with SMTP id d2e1a72fcca58-8520b98be69mr40252038b3a.8.1787630458620; Mon, 24 Aug 2026 21:00:58 -0700 (PDT) Received: from [10.218.14.97] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8520f1638aesm2534359b3a.57.2026.08.24.21.00.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Aug 2026 21:00:58 -0700 (PDT) Message-ID: <17735f83-fd07-4fad-97a3-727cfbeabbcb@oss.qualcomm.com> Date: Tue, 25 Aug 2026 09:30:50 +0530 Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/7] serial: qcom-geni: Use geni_se_set_rate() for source clock configuration To: Konrad Dybcio , Sudeep Holla , Cristian Marussi , Ulf Hansson , Bjorn Andersson , Konrad Dybcio , Greg Kroah-Hartman , Jiri Slaby , Mark Brown , Viken Dadhaniya , Andi Shyti Cc: mukesh.savaliya@oss.qualcomm.com, chandana.chiluveru@oss.qualcomm.com, arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org, linux-spi@vger.kernel.org, linux-i2c@vger.kernel.org References: <20260805-derive_clk_perf_tbl_from_perf_domain_opp_table-v1-0-61171ab1cdce@oss.qualcomm.com> <20260805-derive_clk_perf_tbl_from_perf_domain_opp_table-v1-4-61171ab1cdce@oss.qualcomm.com> <4e0d636a-7975-4711-8070-6f71957b754e@oss.qualcomm.com> Content-Language: en-US From: Praveen Talari In-Reply-To: <4e0d636a-7975-4711-8070-6f71957b754e@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: 3x3ZuJ440dYl7kHN3ATG0TyBy1B_plLL X-Proofpoint-GUID: 3x3ZuJ440dYl7kHN3ATG0TyBy1B_plLL X-Proofpoint-Spam-Info: AW1haW4tMjYwODI1MDAzMSBTYWx0ZWRfXxiCsI9NBR+Ii 5mkn2YgPjZXVuGES9bYXCvujXs2Zg9C5zficnU98OlaeGVx9f11A8uV7CNp75/aEQ+q0nui23tb zLyvYIa2yiUwArAfjz7enmMJr9rE6p8= X-Authority-Analysis: v=2.4 cv=TqPWQjXh c=1 sm=1 tr=0 ts=6a8d137b cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=gztmCChag-4to_nYmxUA:9 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI1MDAzMSBTYWx0ZWRfX5M22Z28OShRr ggTdLWw5lr2jfHffCvDUe7EuTiP1sIgXC+h70lg70SWoP4Y/fZav/pvG+ngn9wL8J7Q4xqj7VRH CqNOGl4tjZDOifVqPLJ3Nf4dYfttcnj0QkhdR3dQULR092acGy7Kf9DByj+jxeEprQNGJXX1FaY 1dEZbK3OjzTMRBVpJd8lB3GCGq1cN2E09aw4PstfsNOf4R/zWnOnAzIks25Igy6/4wsCg/ZaaDw 6m8WwaPJSd4uunfPx9JzcwRlUKpvbTTeaTDoTmkDAGRQQqgPaDvMfji+USnTeORLIQ/V4hViiyG R/RNiJX1F9yo8vVFB4euCRO4xkdJToh9SjUj7jUAukJLjBpacwOHQWMy/satGv2u8SbwUxRm4rT kbrRICtV0OSqgZXMx3TbzEwDm7h7dAcpmu3yCtAmPy+DR+4CcWIr6WN8w35n5hXDRQePzesCM18 BIsedEDkcAzPKiLfN0w== 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=2026-08-25_01,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 malwarescore=0 spamscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608250031 HI Konrad, On 24-08-2026 20:35, Konrad Dybcio wrote: > On 8/4/26 9:57 PM, Praveen Talari wrote: >> The driver calls dev_pm_opp_set_rate() directly on uport->dev to apply >> the computed source clock frequency, and dispatches baud rate handling >> through a per-variant dev_data->set_rate() callback that either >> recalculates the clock divider (Linux clock managed path) or selects >> a performance level via geni_se_set_perf_level() (SA8255P firmware >> managed path). > [...] > >> + geni_se_set_rate(&port->se, 0); > This ends up calling dev_pm_opp_set_rate(0) [i see this is an existing > bug in geni_se_resources_deactivate()], which removes the power vote, > but does nothing to the clock (neither set_rate nor disable_unprepare), > which will crash the platform > > Both of these calls (new and existing) should be removed. Clocks will > be disabled by geni_se_clks_off() in geni_se_resources_deactivate(). > > Then, we should do dev_pm_set_opp(se->dev, NULL) *after* they are off > to remove any trailing OPP resources (i.e. icc votes defined in the OPP > table in our case) So, if I understand correctly, the expected sequence is: 1. Disable the clocks. 2. Remove the OPP/performance resources. Thanks, Praveen Talari > > Konrad