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Wed, 09 Sep 2026 06:37:36 -0700 (PDT) X-Received: by 2002:a05:6122:6b14:b0:5c3:a1f5:7569 with SMTP id 71dfb90a1353d-5c8148141a8mr3923741e0c.1.1788961056058; Wed, 09 Sep 2026 06:37:36 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b7673bd6e5sm438764e87.22.2026.09.09.06.37.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Sep 2026 06:37:35 -0700 (PDT) Message-ID: Date: Wed, 9 Sep 2026 15:37:32 +0200 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] clk: qcom: ipq-cmn-pll: keep the CMN block bus clocks enabled To: Stanislaw Pal , Jie Luo , Kathiravan Thirumoorthy Cc: Mieczyslaw Nalewaj , Bjorn Andersson , Stephen Boyd , Michael Turquette , Georg Seema , Brian Masney , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260909132049.37611-1-kuncy7@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260909132049.37611-1-kuncy7@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDE1MiBTYWx0ZWRfXzJPNB3hBUjdk Dm4t93qA5Sd+vbjjzdYb3sjW9DEiCX1nn/zXkkSu5EPnYIMI1A8BcKLb2S/VA33X20jXnMLRrnm yBztGmq1chlzvv6fmy9GLJS0ArF/wAo= X-Authority-Analysis: v=2.4 cv=J52aKgnS c=1 sm=1 tr=0 ts=6aa16126 cx=c_pps a=JIY1xp/sjQ9K5JH4t62bdg==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=oVlbBDgyKwfZh0hzoKgA:9 a=QEXdDO2ut3YA:10 a=tNoRWFLymzeba-QzToBc:22 X-Proofpoint-ORIG-GUID: tqtyFnmHVtldi9HaA58q9hOLd3ooorLJ X-Proofpoint-GUID: tqtyFnmHVtldi9HaA58q9hOLd3ooorLJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDE1MiBTYWx0ZWRfX4sZDyw8kWzt3 /S8zQckcWI+dbMnVxi5Y2j6fRpyHmbPsgN4jxNzO72x/4w4X2kB6/eS9Ho0KvXvFU6aBtVJA0ea 1Fwabaq9lYNN6KMQt8nY72vHeSqNwfg7D/nIawjyBI3Ay3OSqqtytFj5kmWfGMuewC6MwUb9uqE TfJfUwf62Tb/aOSzG65TCj9it4qOc0FBWVSLqRwNYisZ+6xh1jI9dG0HsE8+9fAfrplHuulhI/1 1esiPDQ8lP6WopMvVjSm9wD23TdcrWamI2FsFrWPMv2pdSPTiAtsKqBGaQl0XSyfkA/woTdHm07 bd+7S4l+2hLGACJU2vJpv5I40qZUAxVamPSP3NoUemFwZyUT1laKzDCXpDTF0P27eYri4UySZao G02fU3yNce87S/t1YhpviQ6jfRFnw4Q5fLSCYPdQXA+p1xk3Fsaz+8B0jC4xubbpvY2G3JFI+rp g1AfppTn/tDLMlcE/ow== 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=2026-09-08_03,2026-09-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 adultscore=0 malwarescore=0 suspectscore=0 impostorscore=0 bulkscore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609090152 On 9/9/26 3:20 PM, Stanislaw Pal wrote: > On 9/9/26 2:12 PM, Konrad Dybcio wrote: >> Is it only the UNIPHY consuming the 50 MHz one? >> >> What consumes the XO clock? What consumes the sleep clock? > > Nothing in Linux consumes any of the three today. Yes, that's more than clear :) I'm trying to ask Jie about the platform details, to which I unfortunately don't have access at the moment.. or maybe +Kathiravan? [...] > I would rather this did not decide the patch, though, because the > failure it fixes is not a later register access to the CMN block. > Mieczyslaw's summary in the v4 thread put it that way; the mechanism I > measured is narrower, and it is what the v4 commit message describes: > > - gating those same two clocks on an idle, fully booted GL-B3000 > (runtime PM autosuspend, gate landing ~75 s after probe) is > harmless - runtime_status "suspended", both radios still serving > clients; > - with UNIPHY0 disabled in the device tree, so that no uniphy driver > exists in that boot at all, the board still dies in 6 of 7 boots; > - stretching the end of probe by 15 ms, or by a full 2 s, still ends > in a watchdog reset, 8 of 8 boots each. > > So what hangs the SoC is the gate transition landing amid early-boot > bus activity, not any consumer's access afterwards. I would be more inclined to believe it's racing against some other driver enabling/disabling something else, perhaps a register that depends on a clock derived from these two. When that crash occurs does the device enter crashdump mode (USB PID 0x900e)? Konrad