From: Ulf Hansson <ulf.hansson@linaro.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Mark Brown <broonie@kernel.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Peter Geis <pgwipeout@gmail.com>,
Nicolas Chauvet <kwizart@gmail.com>,
Krzysztof Kozlowski <krzk@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Kevin Hilman <khilman@kernel.org>,
Peter De Schrijver <pdeschrijver@nvidia.com>,
Viresh Kumar <vireshk@kernel.org>,
Stephen Boyd <sboyd@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
driverdevel <devel@driverdev.osuosl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
DTML <devicetree@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Linux Media Mailing List <linux-media@vger.kernel.org>,
linux-tegra <linux-tegra@vger.kernel.org>,
linux-clk <linux-clk@vger.kernel.org>
Subject: Re: [PATCH v2 28/48] soc/tegra: Introduce core power domain driver
Date: Tue, 12 Jan 2021 14:57:32 +0100 [thread overview]
Message-ID: <CAPDyKFpQFyO_Qfoy0-_=+e3Lp8vRx8yaYjmPReT_5WJZSLet-w@mail.gmail.com> (raw)
In-Reply-To: <20201217180638.22748-29-digetx@gmail.com>
On Thu, 17 Dec 2020 at 19:07, Dmitry Osipenko <digetx@gmail.com> wrote:
>
> NVIDIA Tegra SoCs have multiple power domains, each domain corresponds
> to an external SoC power rail. Core power domain covers vast majority of
> hardware blocks within a Tegra SoC. The voltage of a power domain should
> be set to a value which satisfies all devices within a power domain. Add
> driver for the core power domain in order to manage the voltage state of
> the domain. This allows us to support a system-wide DVFS on Tegra.
>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
FYI: from a genpd provider driver point of view, this looks good to
me. However, withholding my ack for the next version, just to make
sure I take a second look.
Kind regards
Uffe
> ---
> drivers/soc/tegra/Kconfig | 6 ++
> drivers/soc/tegra/Makefile | 1 +
> drivers/soc/tegra/core-power-domain.c | 125 ++++++++++++++++++++++++++
> include/soc/tegra/common.h | 6 ++
> 4 files changed, 138 insertions(+)
> create mode 100644 drivers/soc/tegra/core-power-domain.c
>
> diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
> index bcd61ae59ba3..fccbc168dd87 100644
> --- a/drivers/soc/tegra/Kconfig
> +++ b/drivers/soc/tegra/Kconfig
> @@ -16,6 +16,7 @@ config ARCH_TEGRA_2x_SOC
> select SOC_TEGRA_COMMON
> select SOC_TEGRA_FLOWCTRL
> select SOC_TEGRA_PMC
> + select SOC_TEGRA_CORE_POWER_DOMAIN
> select SOC_TEGRA20_VOLTAGE_COUPLER
> select TEGRA_TIMER
> help
> @@ -31,6 +32,7 @@ config ARCH_TEGRA_3x_SOC
> select SOC_TEGRA_COMMON
> select SOC_TEGRA_FLOWCTRL
> select SOC_TEGRA_PMC
> + select SOC_TEGRA_CORE_POWER_DOMAIN
> select SOC_TEGRA30_VOLTAGE_COUPLER
> select TEGRA_TIMER
> help
> @@ -170,3 +172,7 @@ config SOC_TEGRA20_VOLTAGE_COUPLER
> config SOC_TEGRA30_VOLTAGE_COUPLER
> bool "Voltage scaling support for Tegra30 SoCs"
> depends on ARCH_TEGRA_3x_SOC || COMPILE_TEST
> +
> +config SOC_TEGRA_CORE_POWER_DOMAIN
> + bool
> + select PM_GENERIC_DOMAINS
> diff --git a/drivers/soc/tegra/Makefile b/drivers/soc/tegra/Makefile
> index 9c809c1814bd..8f1294f954b4 100644
> --- a/drivers/soc/tegra/Makefile
> +++ b/drivers/soc/tegra/Makefile
> @@ -7,3 +7,4 @@ obj-$(CONFIG_SOC_TEGRA_PMC) += pmc.o
> obj-$(CONFIG_SOC_TEGRA_POWERGATE_BPMP) += powergate-bpmp.o
> obj-$(CONFIG_SOC_TEGRA20_VOLTAGE_COUPLER) += regulators-tegra20.o
> obj-$(CONFIG_SOC_TEGRA30_VOLTAGE_COUPLER) += regulators-tegra30.o
> +obj-$(CONFIG_SOC_TEGRA_CORE_POWER_DOMAIN) += core-power-domain.o
> diff --git a/drivers/soc/tegra/core-power-domain.c b/drivers/soc/tegra/core-power-domain.c
> new file mode 100644
> index 000000000000..7c0cec8c79fd
> --- /dev/null
> +++ b/drivers/soc/tegra/core-power-domain.c
> @@ -0,0 +1,125 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * NVIDIA Tegra SoC Core Power Domain Driver
> + */
> +
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/pm_opp.h>
> +#include <linux/slab.h>
> +
> +#include <soc/tegra/common.h>
> +
> +static struct lock_class_key tegra_core_domain_lock_class;
> +static bool tegra_core_domain_state_synced;
> +
> +static int tegra_genpd_set_performance_state(struct generic_pm_domain *genpd,
> + unsigned int level)
> +{
> + struct dev_pm_opp *opp;
> + int err;
> +
> + opp = dev_pm_opp_find_level_ceil(&genpd->dev, &level);
> + if (IS_ERR(opp)) {
> + dev_err(&genpd->dev, "failed to find OPP for level %u: %pe\n",
> + level, opp);
> + return PTR_ERR(opp);
> + }
> +
> + err = dev_pm_opp_set_voltage(&genpd->dev, opp);
> + dev_pm_opp_put(opp);
> +
> + if (err) {
> + dev_err(&genpd->dev, "failed to set voltage to %duV: %d\n",
> + level, err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static unsigned int
> +tegra_genpd_opp_to_performance_state(struct generic_pm_domain *genpd,
> + struct dev_pm_opp *opp)
> +{
> + return dev_pm_opp_get_level(opp);
> +}
> +
> +static int tegra_core_domain_probe(struct platform_device *pdev)
> +{
> + struct generic_pm_domain *genpd;
> + struct opp_table *opp_table;
> + const char *rname = "power";
> + int err;
> +
> + genpd = devm_kzalloc(&pdev->dev, sizeof(*genpd), GFP_KERNEL);
> + if (!genpd)
> + return -ENOMEM;
> +
> + genpd->name = pdev->dev.of_node->name;
> + genpd->set_performance_state = tegra_genpd_set_performance_state;
> + genpd->opp_to_performance_state = tegra_genpd_opp_to_performance_state;
> +
> + opp_table = devm_pm_opp_set_regulators(&pdev->dev, &rname, 1);
> + if (IS_ERR(opp_table))
> + return dev_err_probe(&pdev->dev, PTR_ERR(opp_table),
> + "failed to set OPP regulator\n");
> +
> + err = pm_genpd_init(genpd, NULL, false);
> + if (err) {
> + dev_err(&pdev->dev, "failed to init genpd: %d\n", err);
> + return err;
> + }
> +
> + /*
> + * We have a "PMC -> Core" hierarchy of the power domains where
> + * PMC needs to resume and change performance (voltage) of the
> + * Core domain from the PMC GENPD on/off callbacks, hence we need
> + * to annotate the lock in order to remove confusion from the
> + * lockdep checker when a nested access happens.
> + */
> + lockdep_set_class(&genpd->mlock, &tegra_core_domain_lock_class);
> +
> + err = of_genpd_add_provider_simple(pdev->dev.of_node, genpd);
> + if (err) {
> + dev_err(&pdev->dev, "failed to add genpd: %d\n", err);
> + goto remove_genpd;
> + }
> +
> + return 0;
> +
> +remove_genpd:
> + pm_genpd_remove(genpd);
> +
> + return err;
> +}
> +
> +bool tegra_soc_core_domain_state_synced(void)
> +{
> + return tegra_core_domain_state_synced;
> +}
> +
> +static void tegra_core_domain_sync_state(struct device *dev)
> +{
> + tegra_core_domain_state_synced = true;
> +
> + dev_pm_opp_sync_regulators(dev);
> +}
> +
> +static const struct of_device_id tegra_core_domain_match[] = {
> + { .compatible = "nvidia,tegra20-core-domain", },
> + { .compatible = "nvidia,tegra30-core-domain", },
> + { }
> +};
> +
> +static struct platform_driver tegra_core_domain_driver = {
> + .driver = {
> + .name = "tegra-core-power",
> + .of_match_table = tegra_core_domain_match,
> + .suppress_bind_attrs = true,
> + .sync_state = tegra_core_domain_sync_state,
> + },
> + .probe = tegra_core_domain_probe,
> +};
> +builtin_platform_driver(tegra_core_domain_driver);
> diff --git a/include/soc/tegra/common.h b/include/soc/tegra/common.h
> index 57b56793a9e5..6c2ccbbbf073 100644
> --- a/include/soc/tegra/common.h
> +++ b/include/soc/tegra/common.h
> @@ -27,6 +27,7 @@ struct tegra_core_opp_params {
>
> #ifdef CONFIG_ARCH_TEGRA
> bool soc_is_tegra(void);
> +bool tegra_soc_core_domain_state_synced(void);
> int devm_tegra_core_dev_init_opp_table(struct device *dev,
> struct tegra_core_opp_params *cfg);
> #else
> @@ -35,6 +36,11 @@ static inline bool soc_is_tegra(void)
> return false;
> }
>
> +static inline bool tegra_soc_core_domain_state_synced(void)
> +{
> + return false;
> +}
> +
> static inline int
> devm_tegra_core_dev_init_opp_table(struct device *dev,
> struct tegra_core_opp_params *cfg)
> --
> 2.29.2
>
next prev parent reply other threads:[~2021-01-12 13:59 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-17 18:05 [PATCH v2 00/48] Introduce core voltage scaling for NVIDIA Tegra20/30 SoCs Dmitry Osipenko
2020-12-17 18:05 ` [PATCH v2 01/48] dt-bindings: memory: tegra20: emc: Replace core regulator with power domain Dmitry Osipenko
2020-12-21 22:53 ` Rob Herring
2020-12-17 18:05 ` [PATCH v2 02/48] dt-bindings: memory: tegra30: " Dmitry Osipenko
2020-12-21 22:54 ` Rob Herring
2020-12-22 19:16 ` Dmitry Osipenko
2020-12-17 18:05 ` [PATCH v2 03/48] dt-bindings: memory: tegra124: " Dmitry Osipenko
2020-12-17 18:05 ` [PATCH v2 04/48] dt-bindings: host1x: Document OPP and power domain properties Dmitry Osipenko
2020-12-22 0:09 ` Rob Herring
2020-12-17 18:05 ` [PATCH v2 05/48] media: dt: bindings: tegra-vde: " Dmitry Osipenko
2020-12-22 0:09 ` Rob Herring
2020-12-17 18:05 ` [PATCH v2 06/48] dt-bindings: clock: tegra: Document clocks sub-node Dmitry Osipenko
2020-12-22 0:14 ` Rob Herring
2020-12-22 19:16 ` Dmitry Osipenko
2020-12-17 18:05 ` [PATCH v2 07/48] dt-bindings: arm: tegra: Add binding for core power domain Dmitry Osipenko
2020-12-19 10:57 ` Krzysztof Kozlowski
2020-12-20 18:26 ` Dmitry Osipenko
2020-12-17 18:05 ` [PATCH v2 08/48] regulator: Make regulator_sync_voltage() usable by coupled regulators Dmitry Osipenko
2020-12-17 18:05 ` [PATCH v2 09/48] opp: Add dev_pm_opp_sync_regulators() Dmitry Osipenko
2020-12-22 6:41 ` Viresh Kumar
2020-12-17 18:06 ` [PATCH v2 10/48] opp: Add dev_pm_opp_set_voltage() Dmitry Osipenko
2020-12-22 6:41 ` Viresh Kumar
2020-12-17 18:06 ` [PATCH v2 11/48] opp: Add dev_pm_opp_find_level_ceil() Dmitry Osipenko
2020-12-22 6:42 ` Viresh Kumar
2020-12-22 19:15 ` Dmitry Osipenko
2020-12-23 4:19 ` Viresh Kumar
2020-12-23 20:37 ` Dmitry Osipenko
2020-12-24 6:43 ` Viresh Kumar
2020-12-24 13:00 ` Dmitry Osipenko
2020-12-28 6:22 ` Viresh Kumar
2020-12-28 14:03 ` Dmitry Osipenko
2020-12-30 4:46 ` Viresh Kumar
2020-12-30 14:02 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 12/48] opp: Add dev_pm_opp_get_required_pstate() Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 13/48] opp: Add resource-managed versions of OPP API functions Dmitry Osipenko
2020-12-22 8:55 ` Viresh Kumar
2020-12-22 19:14 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 14/48] opp: Filter out OPPs based on availability of a required-OPP Dmitry Osipenko
2020-12-22 8:59 ` Viresh Kumar
2020-12-22 19:17 ` Dmitry Osipenko
2020-12-23 4:22 ` Viresh Kumar
2020-12-23 20:48 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 15/48] opp: Support set_opp() customization without requiring to use regulators Dmitry Osipenko
2020-12-22 9:01 ` Viresh Kumar
2020-12-22 19:18 ` Dmitry Osipenko
2020-12-23 6:01 ` Viresh Kumar
2020-12-23 20:38 ` Dmitry Osipenko
2020-12-24 4:10 ` Viresh Kumar
2020-12-24 12:16 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 16/48] opp: Handle missing OPP table in dev_pm_opp_xlate_performance_state() Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 17/48] opp: Correct debug message in _opp_add_static_v2() Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 18/48] opp: Print OPP level in debug message of _opp_add_static_v2() Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 19/48] opp: Fix adding OPP entries in a wrong order if rate is unavailable Dmitry Osipenko
2020-12-22 9:12 ` Viresh Kumar
2020-12-22 19:19 ` Dmitry Osipenko
2020-12-23 4:34 ` Viresh Kumar
2020-12-23 20:36 ` Dmitry Osipenko
2020-12-24 6:28 ` Viresh Kumar
2020-12-24 12:14 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 20/48] PM: domains: Make set_performance_state() callback optional Dmitry Osipenko
2021-01-11 9:10 ` Ulf Hansson
2020-12-17 18:06 ` [PATCH v2 21/48] PM: domains: Add "performance" column to debug summary Dmitry Osipenko
2021-01-11 9:13 ` Ulf Hansson
2021-01-11 11:28 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 22/48] soc/tegra: pmc: Fix imbalanced clock disabling in error code path Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 23/48] soc/tegra: pmc: Pulse resets after removing power clamp Dmitry Osipenko
2020-12-30 14:56 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 24/48] soc/tegra: pmc: Ensure that clock rates aren't too high Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 25/48] soc/tegra: pmc: Print out domain name when reset fails to acquire Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 26/48] soc/tegra: Add devm_tegra_core_dev_init_opp_table() Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 27/48] soc/tegra: Add CONFIG_SOC_TEGRA_COMMON and select PM_OPP by default Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 28/48] soc/tegra: Introduce core power domain driver Dmitry Osipenko
2020-12-22 6:40 ` Viresh Kumar
2020-12-22 19:21 ` Dmitry Osipenko
2020-12-22 19:39 ` Dmitry Osipenko
2020-12-23 5:57 ` Viresh Kumar
2020-12-23 20:37 ` Dmitry Osipenko
2020-12-23 20:59 ` Dmitry Osipenko
2020-12-24 6:51 ` Viresh Kumar
2020-12-24 12:14 ` Dmitry Osipenko
2021-01-12 13:57 ` Ulf Hansson [this message]
2020-12-17 18:06 ` [PATCH v2 29/48] soc/tegra: pmc: Link domains to the parent Core domain Dmitry Osipenko
2021-01-12 13:30 ` Ulf Hansson
2021-01-12 16:22 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 30/48] soc/tegra: regulators: Fix locking up when voltage-spread is out of range Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 31/48] soc/tegra: regulators: Support Core domain state syncing Dmitry Osipenko
2021-01-12 13:57 ` Ulf Hansson
2020-12-17 18:06 ` [PATCH v2 32/48] clk: tegra: Support runtime PM, power domain and OPP Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 33/48] gpu: host1x: Add host1x_channel_stop() Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 34/48] gpu: host1x: Support power management Dmitry Osipenko
2020-12-17 18:21 ` Mikko Perttunen
2020-12-17 18:45 ` Dmitry Osipenko
2020-12-17 20:58 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 35/48] drm/tegra: dc: Support OPP and SoC core voltage scaling Dmitry Osipenko
2021-01-12 14:16 ` Ulf Hansson
2020-12-17 18:06 ` [PATCH v2 36/48] drm/tegra: gr2d: Correct swapped device-tree compatibles Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 37/48] drm/tegra: gr2d: Support OPP and power management Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 38/48] drm/tegra: g3d: " Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 39/48] drm/tegra: vic: Stop channel before suspending Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 40/48] media: staging: tegra-vde: Support OPP and generic power domain Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 41/48] memory: tegra20-emc: Use devm_tegra_core_dev_init_opp_table() Dmitry Osipenko
2020-12-19 11:02 ` Krzysztof Kozlowski
2020-12-20 18:34 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 42/48] memory: tegra30-emc: " Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 43/48] ARM: tegra: Add OPP tables and power domains to Tegra20 device-tree Dmitry Osipenko
2020-12-22 5:47 ` Viresh Kumar
2020-12-22 19:24 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 44/48] ARM: tegra: Add OPP tables and power domains to Tegra30 device-tree Dmitry Osipenko
2020-12-22 9:14 ` Viresh Kumar
2020-12-22 19:25 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 45/48] ARM: tegra: acer-a500: Enable core voltage scaling Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 46/48] ARM: tegra: ventana: " Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 47/48] ARM: tegra: ventana: Support CPU voltage scaling and thermal throttling Dmitry Osipenko
2020-12-17 18:28 ` Daniel Lezcano
2020-12-17 19:01 ` Dmitry Osipenko
2020-12-17 19:36 ` Daniel Lezcano
2020-12-17 20:28 ` Dmitry Osipenko
2020-12-17 21:19 ` Daniel Lezcano
2020-12-17 21:56 ` Dmitry Osipenko
2020-12-17 18:06 ` [PATCH v2 48/48] ARM: tegra: cardhu: " Dmitry Osipenko
2020-12-17 18:28 ` Daniel Lezcano
2020-12-18 7:14 ` [PATCH v2 00/48] Introduce core voltage scaling for NVIDIA Tegra20/30 SoCs Viresh Kumar
2020-12-18 13:51 ` Dmitry Osipenko
2020-12-22 9:15 ` Viresh Kumar
2020-12-22 19:14 ` Dmitry Osipenko
2021-01-05 17:11 ` Krzysztof Kozlowski
2021-01-07 19:39 ` Dmitry Osipenko
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