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[79.139.163.57]) by smtp.googlemail.com with ESMTPSA id q30sm2086817lfb.108.2021.10.05.15.43.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Oct 2021 15:43:21 -0700 (PDT) Subject: Re: [PATCH v13 06/35] clk: tegra: Support runtime PM and power domain From: Dmitry Osipenko To: Ulf Hansson Cc: Thierry Reding , Jonathan Hunter , Viresh Kumar , Stephen Boyd , Peter De Schrijver , Mikko Perttunen , Peter Chen , Lee Jones , =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Nishanth Menon , Adrian Hunter , Michael Turquette , Linux Kernel Mailing List , linux-tegra , Linux PM , Linux USB List , linux-staging@lists.linux.dev, linux-pwm@vger.kernel.org, linux-mmc , dri-devel , DTML , linux-clk , Mark Brown , Vignesh Raghavendra , Richard Weinberger , Miquel Raynal , Lucas Stach , Stefan Agner , Mauro Carvalho Chehab , David Heidelberg References: <20210926224058.1252-1-digetx@gmail.com> <20210926224058.1252-7-digetx@gmail.com> <24101cd6-d3f5-1e74-db39-145ecd30418b@gmail.com> <4bdba8a2-4b9b-ed7d-e6ca-9218d8200a85@gmail.com> Message-ID: <74a47158-e2e4-5fd0-3f37-0b50d4ead4d9@gmail.com> Date: Wed, 6 Oct 2021 01:43:20 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <4bdba8a2-4b9b-ed7d-e6ca-9218d8200a85@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 06.10.2021 01:19, Dmitry Osipenko пишет: ... > I reproduced the OFF problem by removing the clk prepare/unprepare from > the suspend/resume of the clk driver and making some extra changes to > clock tree topology and etc to trigger the problem on Nexus 7. > > tegra-pmc 7000e400.pmc: failed to turn off PM domain heg: -13 > > It happens from genpd_suspend_noirq() -> tegra_genpd_power_off() -> clk > -> GENPD -> I2C -> runtime-pm. > > -13 is EACCES, it comes from the runtime PM of I2C device. RPM is > prohibited/disabled during late (NOIRQ) suspend by the drivers core. My bad, I double-checked and it's not I2C RPM that is failing now, but the clock's RPM [1], which is also unavailable during NOIRQ. [1] https://elixir.free-electrons.com/linux/v5.15-rc4/source/drivers/clk/clk.c#L116 Previously it was I2C RPM that was failing in a similar way, but code changed a tad since that time.