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From: Dmitry Osipenko <digetx@gmail.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
	"Jonathan Hunter" <jonathanh@nvidia.com>,
	"Viresh Kumar" <vireshk@kernel.org>,
	"Stephen Boyd" <sboyd@kernel.org>,
	"Peter De Schrijver" <pdeschrijver@nvidia.com>,
	"Mikko Perttunen" <mperttunen@nvidia.com>,
	"Peter Chen" <peter.chen@kernel.org>,
	"Lee Jones" <lee.jones@linaro.org>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Nishanth Menon" <nm@ti.com>,
	"Adrian Hunter" <adrian.hunter@intel.com>,
	"Michael Turquette" <mturquette@baylibre.com>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	linux-tegra <linux-tegra@vger.kernel.org>,
	"Linux PM" <linux-pm@vger.kernel.org>,
	"Linux USB List" <linux-usb@vger.kernel.org>,
	linux-staging@lists.linux.dev, linux-pwm@vger.kernel.org,
	linux-mmc <linux-mmc@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	DTML <devicetree@vger.kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	"Mark Brown" <broonie@kernel.org>,
	"Vignesh Raghavendra" <vigneshr@ti.com>,
	"Richard Weinberger" <richard@nod.at>,
	"Miquel Raynal" <miquel.raynal@bootlin.com>,
	"Lucas Stach" <dev@lynxeye.de>, "Stefan Agner" <stefan@agner.ch>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	"David Heidelberg" <david@ixit.cz>
Subject: Re: [PATCH v13 06/35] clk: tegra: Support runtime PM and power domain
Date: Thu, 7 Oct 2021 01:01:37 +0300	[thread overview]
Message-ID: <4c7b1a4c-c136-3650-8f77-9f98caa506f7@gmail.com> (raw)
In-Reply-To: <b06bf794-b8b3-417b-58ef-4d815ca86c95@gmail.com>

07.10.2021 00:14, Dmitry Osipenko пишет:
> 06.10.2021 15:43, Ulf Hansson пишет:
>> On Wed, 6 Oct 2021 at 00:43, Dmitry Osipenko <digetx@gmail.com> wrote:
>>>
>>> 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.
>>
>> Yes, that sounds reasonable.
>>
>> You would then need a similar patch for the tegra clock driver as I
>> suggested for tegra I2C driver. That should solve the problem, I
>> think.
>>
>>>
>>> [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.
>>
>> Alright. In any case, as long as the devices gets suspended in the
>> correct order, I think it should be fine to cook a patch along the
>> lines of what I suggest for the I2C driver as well.
>>
>> It should work, I think. Although, maybe you want to avoid runtime
>> resuming the I2C device, unless it's the device belonging to the PMIC
>> interface, if there is a way to distinguish that for the driver.
> 
> Ulf, thank you very much for the suggestions! I was thinking about this
> all once again and concluded that the simplest variant will be to just
> remove the suspend ops from the clk driver since neither of PLLs require
> high voltage. We now have voltage bumped to a nominal level during
> suspend by Tegra's regulator-coupler driver and it's much higher than
> voltage needed by PLLs. So the problem I was trying to work around
> doesn't really exist anymore.

I hurried a bit with the conclusion, keep forgetting that I need to
change the clock tree in order to test it all properly :/ It's not fixed
yet.

  reply	other threads:[~2021-10-06 22:01 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-26 22:40 [PATCH v13 00/35] NVIDIA Tegra power management patches for 5.16 Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 01/35] opp: Change type of dev_pm_opp_attach_genpd(names) argument Dmitry Osipenko
2021-10-04  9:11   ` Viresh Kumar
2021-09-26 22:40 ` [PATCH v13 02/35] soc/tegra: Add devm_tegra_core_dev_init_opp_table_common() Dmitry Osipenko
2021-10-01 12:50   ` Ulf Hansson
2021-10-01 19:15     ` Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 03/35] soc/tegra: pmc: Disable PMC state syncing Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 04/35] soc/tegra: Don't print error message when OPPs not available Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 05/35] dt-bindings: clock: tegra-car: Document new clock sub-nodes Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 06/35] clk: tegra: Support runtime PM and power domain Dmitry Osipenko
2021-10-01 12:32   ` Ulf Hansson
2021-10-01 19:50     ` Dmitry Osipenko
2021-10-02 20:44     ` Dmitry Osipenko
2021-10-05 13:10       ` Ulf Hansson
2021-10-05 22:19         ` Dmitry Osipenko
2021-10-05 22:43           ` Dmitry Osipenko
2021-10-06  2:40             ` Dmitry Osipenko
2021-10-06 12:43             ` Ulf Hansson
2021-10-06 21:14               ` Dmitry Osipenko
2021-10-06 22:01                 ` Dmitry Osipenko [this message]
2021-10-06 23:21                   ` Dmitry Osipenko
2021-10-07  9:18                     ` Ulf Hansson
2021-10-07 10:36                       ` Dmitry Osipenko
2021-10-06 12:38           ` Ulf Hansson
2021-10-06 21:20             ` Dmitry Osipenko
2021-10-06 21:25             ` Dmitry Osipenko
2021-10-06 22:03             ` Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 07/35] dt-bindings: host1x: Document OPP and power domain properties Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 08/35] dt-bindings: host1x: Document Memory Client resets of Host1x, GR2D and GR3D Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 09/35] gpu: host1x: Add runtime PM and OPP support Dmitry Osipenko
2021-10-01 13:24   ` Ulf Hansson
2021-09-26 22:40 ` [PATCH v13 10/35] gpu: host1x: Add host1x_channel_stop() Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 11/35] drm/tegra: dc: Support OPP and SoC core voltage scaling Dmitry Osipenko
2021-10-01 13:27   ` Ulf Hansson
2021-10-16 15:36     ` Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 12/35] drm/tegra: hdmi: Add OPP support Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 13/35] drm/tegra: gr2d: Support generic power domain and runtime PM Dmitry Osipenko
2021-10-01 13:39   ` Ulf Hansson
2021-10-01 14:29     ` Dmitry Osipenko
2021-10-01 14:55       ` Ulf Hansson
2021-10-01 19:00         ` Dmitry Osipenko
2021-10-04 11:01           ` Ulf Hansson
2021-10-04 15:57             ` Dmitry Osipenko
2021-10-05  8:45               ` Ulf Hansson
2021-10-05 17:16                 ` Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 14/35] drm/tegra: gr3d: " Dmitry Osipenko
2021-10-01 14:06   ` Ulf Hansson
2021-10-01 21:25     ` Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 15/35] drm/tegra: vic: Support system suspend Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 16/35] usb: chipidea: tegra: Add runtime PM and OPP support Dmitry Osipenko
2021-09-30  0:40   ` Dmitry Osipenko
2021-09-30 14:06   ` Peter Chen
2021-09-30 14:08     ` Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 17/35] bus: tegra-gmi: " Dmitry Osipenko
2021-10-01 14:18   ` Ulf Hansson
2021-09-26 22:40 ` [PATCH v13 18/35] pwm: tegra: " Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 19/35] mmc: sdhci-tegra: " Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 20/35] mtd: rawnand: tegra: " Dmitry Osipenko
2021-10-01 14:24   ` Ulf Hansson
2021-10-01 14:35     ` Dmitry Osipenko
2021-10-01 15:01       ` Ulf Hansson
2021-10-17  8:38         ` Dmitry Osipenko
2021-10-19 11:40           ` Ulf Hansson
2021-09-26 22:40 ` [PATCH v13 21/35] spi: tegra20-slink: Add " Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 22/35] media: dt: bindings: tegra-vde: Convert to schema Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 23/35] media: dt: bindings: tegra-vde: Document OPP and power domain Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 24/35] media: staging: tegra-vde: Support generic " Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 25/35] soc/tegra: fuse: Reset hardware Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 26/35] soc/tegra: fuse: Use resource-managed helpers Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 27/35] soc/tegra: regulators: Prepare for suspend Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 28/35] soc/tegra: pmc: Rename 3d power domains Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 29/35] soc/tegra: pmc: Rename core power domain Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 30/35] soc/tegra: pmc: Enable core domain support for Tegra20 and Tegra30 Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 31/35] ARM: tegra: Add OPP tables and power domains to Tegra20 device-trees Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 32/35] ARM: tegra: Add OPP tables and power domains to Tegra30 device-trees Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 33/35] ARM: tegra: Add Memory Client resets to Tegra20 GR2D, GR3D and Host1x Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 34/35] ARM: tegra: Add Memory Client resets to Tegra30 " Dmitry Osipenko
2021-09-26 22:40 ` [PATCH v13 35/35] ARM: tegra20/30: Disable unused host1x hardware Dmitry Osipenko
2021-10-01 14:36 ` [PATCH v13 00/35] NVIDIA Tegra power management patches for 5.16 Ulf Hansson
2021-10-01 14:40   ` Dmitry Osipenko
2021-10-01 15:02     ` Ulf Hansson
2021-10-04  9:11 ` Viresh Kumar
2021-10-04 14:52   ` Dmitry Osipenko

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