From: Dmitry Osipenko <digetx@gmail.com> To: Viresh Kumar <viresh.kumar@linaro.org> Cc: "Thierry Reding" <thierry.reding@gmail.com>, "Jonathan Hunter" <jonathanh@nvidia.com>, "Ulf Hansson" <ulf.hansson@linaro.org>, "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>, "Mark Brown" <broonie@kernel.org>, "Lee Jones" <lee.jones@linaro.org>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>, "Nishanth Menon" <nm@ti.com>, "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>, "Adrian Hunter" <adrian.hunter@intel.com>, "Mauro Carvalho Chehab" <mchehab@kernel.org>, "Rob Herring" <robh+dt@kernel.org>, "Michael Turquette" <mturquette@baylibre.com>, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org Subject: Re: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper Date: Wed, 18 Aug 2021 08:21:30 +0300 [thread overview] Message-ID: <080469b3-612b-3a34-86e5-7037a64de2fe@gmail.com> (raw) In-Reply-To: <20210818045307.4brb6cafkh3adjth@vireshk-i7> 18.08.2021 07:53, Viresh Kumar пишет: > On 18-08-21, 07:37, Dmitry Osipenko wrote: >> This will set voltage level without having an actively used hardware. >> Take a 3d driver for example, if you set the rate on probe and >> rpm-resume will never be called, then the voltage will be set high, >> while hardware is kept suspended if userspace will never wake it up by >> executing a 3d job. > > What exactly are we looking to achieve with this stuff ? Cache the > current performance state with genpd (based on the state bootloader's > has set) ? Yes, GENPD will cache the perf state across suspend/resume and initially cached value is out of sync with h/w. > Or anything else as well ? Nothing else. But let me clarify it all again. Initially the performance state of all GENPDs is 0 for all devices. The clock rate is preinitialized for all devices to a some default rate by clk driver, or by bootloader or by assigned-clocks in DT. When device is rpm-resumed, the resume callback of a device driver enables the clock. Before clock is enabled, the voltage needs to be configured in accordance to the clk rate. So now we have a GENPD with pstate=0 on a first rpm-resume, which doesn't match the h/w configuration. Calling dev_pm_opp_sync() sets the pstate in accordance to the h/w config. In a previous v7 I proposed to preset the rpm_pstate of GENPD (perf level that is restored before device is rpm-resumed) from PD's attach_dev callback, but Ulf didn't like that because it requires to use and modify GENPD 'private' variables from a PD driver. We decided that will be better to make device drivers to explicitly sync the perf state, which I implemented in this v8.
WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Osipenko <digetx@gmail.com> To: Viresh Kumar <viresh.kumar@linaro.org> Cc: "Thierry Reding" <thierry.reding@gmail.com>, "Jonathan Hunter" <jonathanh@nvidia.com>, "Ulf Hansson" <ulf.hansson@linaro.org>, "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>, "Mark Brown" <broonie@kernel.org>, "Lee Jones" <lee.jones@linaro.org>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>, "Nishanth Menon" <nm@ti.com>, "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>, "Adrian Hunter" <adrian.hunter@intel.com>, "Mauro Carvalho Chehab" <mchehab@kernel.org>, "Rob Herring" <robh+dt@kernel.org>, "Michael Turquette" <mturquette@baylibre.com>, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org Subject: Re: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper Date: Wed, 18 Aug 2021 08:21:30 +0300 [thread overview] Message-ID: <080469b3-612b-3a34-86e5-7037a64de2fe@gmail.com> (raw) In-Reply-To: <20210818045307.4brb6cafkh3adjth@vireshk-i7> 18.08.2021 07:53, Viresh Kumar пишет: > On 18-08-21, 07:37, Dmitry Osipenko wrote: >> This will set voltage level without having an actively used hardware. >> Take a 3d driver for example, if you set the rate on probe and >> rpm-resume will never be called, then the voltage will be set high, >> while hardware is kept suspended if userspace will never wake it up by >> executing a 3d job. > > What exactly are we looking to achieve with this stuff ? Cache the > current performance state with genpd (based on the state bootloader's > has set) ? Yes, GENPD will cache the perf state across suspend/resume and initially cached value is out of sync with h/w. > Or anything else as well ? Nothing else. But let me clarify it all again. Initially the performance state of all GENPDs is 0 for all devices. The clock rate is preinitialized for all devices to a some default rate by clk driver, or by bootloader or by assigned-clocks in DT. When device is rpm-resumed, the resume callback of a device driver enables the clock. Before clock is enabled, the voltage needs to be configured in accordance to the clk rate. So now we have a GENPD with pstate=0 on a first rpm-resume, which doesn't match the h/w configuration. Calling dev_pm_opp_sync() sets the pstate in accordance to the h/w config. In a previous v7 I proposed to preset the rpm_pstate of GENPD (perf level that is restored before device is rpm-resumed) from PD's attach_dev callback, but Ulf didn't like that because it requires to use and modify GENPD 'private' variables from a PD driver. We decided that will be better to make device drivers to explicitly sync the perf state, which I implemented in this v8. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2021-08-18 5:21 UTC|newest] Thread overview: 238+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-17 1:27 [PATCH v8 00/34] NVIDIA Tegra power management patches for 5.16 Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 7:55 ` Viresh Kumar 2021-08-17 7:55 ` Viresh Kumar 2021-08-17 15:49 ` Dmitry Osipenko 2021-08-17 15:49 ` Dmitry Osipenko 2021-08-18 3:55 ` Viresh Kumar 2021-08-18 3:55 ` Viresh Kumar 2021-08-18 4:12 ` Dmitry Osipenko 2021-08-18 4:12 ` Dmitry Osipenko 2021-08-18 4:29 ` Dmitry Osipenko 2021-08-18 4:29 ` Dmitry Osipenko 2021-08-18 4:30 ` Dmitry Osipenko 2021-08-18 4:30 ` Dmitry Osipenko 2021-08-18 4:34 ` Viresh Kumar 2021-08-18 4:34 ` Viresh Kumar 2021-08-18 4:31 ` Viresh Kumar 2021-08-18 4:31 ` Viresh Kumar 2021-08-18 4:37 ` Dmitry Osipenko 2021-08-18 4:37 ` Dmitry Osipenko 2021-08-18 4:53 ` Viresh Kumar 2021-08-18 4:53 ` Viresh Kumar 2021-08-18 5:21 ` Dmitry Osipenko [this message] 2021-08-18 5:21 ` Dmitry Osipenko 2021-08-18 5:58 ` Viresh Kumar 2021-08-18 5:58 ` Viresh Kumar 2021-08-18 6:00 ` Viresh Kumar 2021-08-18 6:00 ` Viresh Kumar 2021-08-18 6:22 ` Dmitry Osipenko 2021-08-18 6:22 ` Dmitry Osipenko 2021-08-18 6:27 ` Viresh Kumar 2021-08-18 6:27 ` Viresh Kumar 2021-08-18 8:29 ` Ulf Hansson 2021-08-18 8:29 ` Ulf Hansson 2021-08-18 9:14 ` Viresh Kumar 2021-08-18 9:14 ` Viresh Kumar 2021-08-18 9:41 ` Ulf Hansson 2021-08-18 9:41 ` Ulf Hansson 2021-08-18 9:42 ` Ulf Hansson 2021-08-18 9:42 ` Ulf Hansson 2021-08-18 9:50 ` Viresh Kumar 2021-08-18 9:50 ` Viresh Kumar 2021-08-18 10:08 ` Ulf Hansson 2021-08-18 10:08 ` Ulf Hansson 2021-08-18 15:43 ` Dmitry Osipenko 2021-08-18 15:43 ` Dmitry Osipenko 2021-08-18 15:46 ` Dmitry Osipenko 2021-08-18 15:46 ` Dmitry Osipenko 2021-08-19 13:07 ` Ulf Hansson 2021-08-19 13:07 ` Ulf Hansson 2021-08-19 19:35 ` Dmitry Osipenko 2021-08-19 19:35 ` Dmitry Osipenko 2021-08-20 5:07 ` Viresh Kumar 2021-08-20 5:07 ` Viresh Kumar 2021-08-20 12:42 ` Ulf Hansson 2021-08-20 12:42 ` Ulf Hansson 2021-08-21 17:34 ` Dmitry Osipenko 2021-08-21 17:34 ` Dmitry Osipenko 2021-08-23 10:46 ` Ulf Hansson 2021-08-23 10:46 ` Ulf Hansson 2021-08-23 15:54 ` Dmitry Osipenko 2021-08-23 15:54 ` Dmitry Osipenko 2021-08-18 15:55 ` Dmitry Osipenko 2021-08-18 15:55 ` Dmitry Osipenko 2021-08-19 6:16 ` Viresh Kumar 2021-08-19 6:16 ` Viresh Kumar 2021-08-19 14:55 ` Ulf Hansson 2021-08-19 14:55 ` Ulf Hansson 2021-08-20 5:18 ` Viresh Kumar 2021-08-20 5:18 ` Viresh Kumar 2021-08-20 12:57 ` Ulf Hansson 2021-08-20 12:57 ` Ulf Hansson 2021-08-23 20:24 ` Dmitry Osipenko 2021-08-23 20:24 ` Dmitry Osipenko 2021-08-24 3:04 ` Viresh Kumar 2021-08-24 3:04 ` Viresh Kumar 2021-08-22 18:35 ` Dmitry Osipenko 2021-08-22 18:35 ` Dmitry Osipenko 2021-08-25 15:41 ` Dmitry Osipenko 2021-08-25 15:41 ` Dmitry Osipenko 2021-08-26 2:54 ` Viresh Kumar 2021-08-26 2:54 ` Viresh Kumar 2021-08-26 2:55 ` Viresh Kumar 2021-08-26 2:55 ` Viresh Kumar 2021-08-17 1:27 ` [PATCH v8 02/34] soc/tegra: pmc: Disable PMC state syncing Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 03/34] soc/tegra: Don't print error message when OPPs not available Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 04/34] soc/tegra: Add devm_tegra_core_dev_init_opp_table_simple() Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 05/34] soc/tegra: Use dev_pm_opp_sync() Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 06/34] dt-bindings: clock: tegra-car: Document new tegra-clocks sub-node Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-18 1:15 ` Rob Herring 2021-08-18 1:15 ` Rob Herring 2021-08-18 1:44 ` Dmitry Osipenko 2021-08-18 1:44 ` Dmitry Osipenko 2021-08-18 13:52 ` Thierry Reding 2021-08-18 13:52 ` Thierry Reding 2021-08-18 15:04 ` Dmitry Osipenko 2021-08-18 15:04 ` Dmitry Osipenko 2021-08-18 13:59 ` Thierry Reding 2021-08-18 13:59 ` Thierry Reding 2021-08-18 15:05 ` Dmitry Osipenko 2021-08-18 15:05 ` Dmitry Osipenko 2021-08-18 16:39 ` Thierry Reding 2021-08-18 16:39 ` Thierry Reding 2021-08-18 16:57 ` Dmitry Osipenko 2021-08-18 16:57 ` Dmitry Osipenko 2021-08-18 17:16 ` Dmitry Osipenko 2021-08-18 17:16 ` Dmitry Osipenko 2021-08-19 16:31 ` Thierry Reding 2021-08-19 16:31 ` Thierry Reding 2021-08-19 22:20 ` Dmitry Osipenko 2021-08-19 22:20 ` Dmitry Osipenko 2021-08-20 2:51 ` Dmitry Osipenko 2021-08-20 2:51 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 07/34] clk: tegra: Support runtime PM and power domain Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-18 14:07 ` Thierry Reding 2021-08-18 14:07 ` Thierry Reding 2021-08-18 15:05 ` Dmitry Osipenko 2021-08-18 15:05 ` Dmitry Osipenko 2021-08-18 16:42 ` Thierry Reding 2021-08-18 16:42 ` Thierry Reding 2021-08-18 17:11 ` Dmitry Osipenko 2021-08-18 17:11 ` Dmitry Osipenko 2021-08-19 16:54 ` Thierry Reding 2021-08-19 16:54 ` Thierry Reding 2021-08-19 22:09 ` Dmitry Osipenko 2021-08-19 22:09 ` Dmitry Osipenko 2021-08-20 11:42 ` Thierry Reding 2021-08-20 11:42 ` Thierry Reding 2021-08-20 13:08 ` Ulf Hansson 2021-08-20 13:08 ` Ulf Hansson 2021-08-21 17:45 ` Dmitry Osipenko 2021-08-21 17:45 ` Dmitry Osipenko 2021-08-23 14:33 ` Thierry Reding 2021-08-23 14:33 ` Thierry Reding 2021-08-23 18:54 ` Dmitry Osipenko 2021-08-23 18:54 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 08/34] dt-bindings: host1x: Document OPP and power domain properties Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 09/34] dt-bindings: host1x: Document Memory Client resets of Host1x, GR2D and GR3D Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-18 1:16 ` Rob Herring 2021-08-18 1:16 ` Rob Herring 2021-08-18 1:37 ` Dmitry Osipenko 2021-08-18 1:37 ` Dmitry Osipenko 2021-08-18 2:04 ` Dmitry Osipenko 2021-08-18 2:04 ` Dmitry Osipenko 2021-08-18 2:07 ` Dmitry Osipenko 2021-08-18 2:07 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 10/34] gpu: host1x: Add host1x_channel_stop() Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 11/34] gpu: host1x: Add runtime PM and OPP support Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 12:04 ` Ulf Hansson 2021-08-17 12:04 ` Ulf Hansson 2021-08-17 14:02 ` Thierry Reding 2021-08-17 14:02 ` Thierry Reding 2021-08-18 8:35 ` Ulf Hansson 2021-08-18 8:35 ` Ulf Hansson 2021-08-18 17:24 ` Dmitry Osipenko 2021-08-18 17:24 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 12/34] drm/tegra: dc: Support OPP and SoC core voltage scaling Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 13/34] drm/tegra: hdmi: Add OPP support Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 14/34] drm/tegra: gr2d: Support power management Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 15/34] drm/tegra: gr3d: " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 16/34] drm/tegra: vic: Support system suspend Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 17/34] usb: chipidea: tegra: Add runtime PM and OPP support Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 18/34] bus: tegra-gmi: " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 19/34] pwm: tegra: " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-19 13:21 ` Thierry Reding 2021-08-19 13:21 ` Thierry Reding 2021-08-19 14:04 ` Ulf Hansson 2021-08-19 14:04 ` Ulf Hansson 2021-08-19 16:17 ` Thierry Reding 2021-08-19 16:17 ` Thierry Reding 2021-08-17 1:27 ` [PATCH v8 20/34] mmc: sdhci-tegra: " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-19 17:03 ` Thierry Reding 2021-08-19 17:03 ` Thierry Reding 2021-08-19 22:37 ` Dmitry Osipenko 2021-08-19 22:37 ` Dmitry Osipenko 2021-08-20 11:35 ` Thierry Reding 2021-08-20 11:35 ` Thierry Reding 2021-08-25 9:45 ` Dmitry Osipenko 2021-08-25 9:45 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 21/34] mtd: rawnand: tegra: " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 8:41 ` Miquel Raynal 2021-08-17 8:41 ` Miquel Raynal 2021-08-17 1:27 ` [PATCH v8 22/34] spi: tegra20-slink: Add " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 12:22 ` Mark Brown 2021-08-17 12:22 ` Mark Brown 2021-08-17 15:53 ` Dmitry Osipenko 2021-08-17 15:53 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 23/34] media: dt: bindings: tegra-vde: Convert to schema Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-18 1:17 ` Rob Herring 2021-08-18 1:17 ` Rob Herring 2021-08-17 1:27 ` [PATCH v8 24/34] media: dt: bindings: tegra-vde: Document OPP and power domain Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-18 1:17 ` Rob Herring 2021-08-18 1:17 ` Rob Herring 2021-08-17 1:27 ` [PATCH v8 25/34] media: staging: tegra-vde: Support generic power domain and OPP Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 26/34] soc/tegra: fuse: Add OPP support Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 27/34] soc/tegra: fuse: Reset hardware Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 28/34] soc/tegra: regulators: Prepare for suspend Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 29/34] soc/tegra: pmc: Enable core domain support for Tegra20 and Tegra30 Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 30/34] ARM: tegra: Add OPP tables and power domains to Tegra20 device-trees Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 31/34] ARM: tegra: Add OPP tables and power domains to Tegra30 device-trees Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 32/34] ARM: tegra: Add Memory Client resets to Tegra20 GR2D, GR3D and Host1x Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 33/34] ARM: tegra: Add Memory Client resets to Tegra30 " Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko 2021-08-17 1:27 ` [PATCH v8 34/34] ARM: tegra20/30: Disable unused host1x hardware Dmitry Osipenko 2021-08-17 1:27 ` Dmitry Osipenko
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