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Hermes SMTP Server) with ESMTPA ID 8051616196a71b1caf318bbe8a22d6b1; Mon, 24 Aug 2026 19:06:23 +0000 (UTC) Message-ID: <8a3f22a7-43ec-469a-a1a7-3a073c24854c@yahoo.com> Date: Mon, 24 Aug 2026 21:06:19 +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: Jie Luo , Konrad Dybcio , Stanislaw Pal Cc: Bjorn Andersson , Stephen Boyd , Michael Turquette , Brian Masney , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260730191353.557494-1-kuncy7@gmail.com> <20260803091003.15285-1-kuncy7@gmail.com> <8af46926-fecc-4396-973e-2290ae285998@oss.qualcomm.com> <181944c2-2484-4384-9c91-45cc87f31955@oss.qualcomm.com> <8286b42e-0314-477b-ac2e-4b410a97d833@yahoo.com> Content-Language: pl From: Mieczyslaw Nalewaj In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Mailer: WebService/1.1.26380 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo On Thu, Aug 20, 2026 at 01:39:52PM +0800, Jie Luo wrote: > As far as I understand, there is no expectation that the CMN PLL > registers need to be accessed after the CMN PLL driver has finished > loading on IPQ5018. > > Could we identify which module is blocked after the CMN PLL driver probe > completes? I don't have a captured trace to point to — this was found through code inspection, not a reproduced hang on hardware, and I'd rather say that plainly than overstate it. That said, "no expectation of post-probe access" isn't something CCF enforces. debugfs (clk_summary and similar) can read back rate/state for any registered clk at any time regardless of whether a formal consumer exists, and nothing stops a future driver — including a possible upstream UNIPHY driver — from calling clk_get_rate() or clk_round_rate() on this provider later. Leaving the AHB/SYS interface gated while the provider is still registered and advertised as active seems fragile on those grounds alone, even without a concrete stack trace in hand today. If anyone on this thread has access to IPQ5018 hardware and can force autosuspend then read back clk_summary for this provider, that would settle it either way — I don't currently have access to test this myself. Reviewed-by: Mieczyslaw Nalewaj