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path: root/drivers/devfreq/exynos-bus.c
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2020-12-15Merge branches 'pm-devfreq' and 'pm-tools'Rafael J. Wysocki
* pm-devfreq: PM / devfreq: tegra30: Separate configurations per-SoC generation PM / devfreq: tegra30: Support interconnect and OPPs from device-tree PM / devfreq: tegra20: Deprecate in a favor of emc-stat based driver PM / devfreq: exynos-bus: Add registration of interconnect child device dt-bindings: devfreq: Add documentation for the interconnect properties soc/tegra: fuse: Add stub for tegra_sku_info soc/tegra: fuse: Export tegra_read_ram_code() clk: tegra: Export Tegra20 EMC kernel symbols PM / devfreq: tegra30: Silence deferred probe error PM / devfreq: tegra20: Relax Kconfig dependency PM / devfreq: tegra20: Silence deferred probe error PM / devfreq: Remove redundant governor_name from struct devfreq PM / devfreq: Add governor attribute flag for specifc sysfs nodes PM / devfreq: Add governor feature flag PM / devfreq: Add tracepoint for frequency changes PM / devfreq: Unify frequency change to devfreq_update_target func trace: events: devfreq: Use fixed indentation size to improve readability * pm-tools: pm-graph v5.8 cpupower: Provide online and offline CPU information
2020-12-09PM / devfreq: exynos: dev_pm_opp_put_*() accepts NULL argumentViresh Kumar
The dev_pm_opp_put_*() APIs now accepts a NULL opp_table pointer and so there is no need for us to carry the extra check. Drop them. Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-11-13PM / devfreq: exynos-bus: Add registration of interconnect child deviceSylwester Nawrocki
This patch adds registration of a child platform device for the exynos interconnect driver. It is assumed that the interconnect provider will only be needed when #interconnect-cells property is present in the bus DT node, hence the child device will be created only when such a property is present. Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2020-09-29PM / devfreq: event: Change prototype of devfreq_event_get_edev_by_phandle ↵Chanwoo Choi
function Previously, devfreq core support 'devfreq-events' property in order to get the devfreq-event device by phandle. But, 'devfreq-events' property name is not proper on devicetree binding because this name doesn't mean the any h/w attribute. The devfreq-event core hand over the rights to decide the property name for getting the devfreq-event device on devicetree. Each devfreq-event driver will decide the property name on devicetree binding and then pass the their own property name to devfreq_event_get_edev_by_phandle function. And change the prototype of devfreq_event_get_edev_count function because of used deprecated 'devfreq-events' property. Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2020-09-29PM / devfreq: Change prototype of devfreq_get_devfreq_by_phandle functionChanwoo Choi
Previously, devfreq core support 'devfreq' property in order to get the devfreq device by phandle. But, 'devfreq' property name is not proper on devicetree binding because this name doesn't mean the any h/w attribute. The devfreq core hand over the right to decide the property name for getting the devfreq device on devicetree. Each devfreq driver will decide the property name on devicetree binding and pass the their own property name to devfreq_get_devfreq_by_phandle function. Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-12-30PM / devfreq: exynos-bus: Add error log when fail to get devfreq-eventYangtao Li
Adding an error log makes it easier to trace the function's error path. Because the error code may be rewritten on return, print error code here. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-12-30PM / devfreq: exynos-bus: Disable devfreq-event device when failsYangtao Li
The exynos_bus_profile_init process may fail, but the devfreq event device remains enabled. Call devfreq_event_disable_edev on the error return path. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-12-30PM / devfreq: exynos-bus: Reduce goto statements and remove unused headersArtur Świgoń
Improve code readability by changing the goto statements as well as eliminating a few more goto statements (related to return paths). Moreover, remove unused header file and adds a missing <linux/of.h>. Signed-off-by: Artur Świgoń <a.swigon@samsung.com> [cw00.choi: Edit patch title and description] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-12-30PM / devfreq: exynos-bus: Extract exynos_bus_profile_init_passive()Artur Świgoń
This patch adds a new exynos_bus_profile_init_passive() extracted from exynos_bus_probe() for devfreq device using passive governor. Signed-off-by: Artur Świgoń <a.swigon@samsung.com> [cw00.choi: Edit description to indicate that function is for devfreq device using passive governor] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-12-30PM / devfreq: exynos-bus: Extract exynos_bus_profile_init()Artur Świgoń
This patch adds a new exynos_bus_profile_init() extracted from exynos_bus_probe() for devfreq device using simple_ondemand governor like parent devfreq device. Signed-off-by: Artur Świgoń <a.swigon@samsung.com> [cw00.choi: Edit description to indicate that new function is for parent devfreq device] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-08-25PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()Kamil Konieczny
Reuse opp core code for setting bus clock and voltage. As a side effect this allow usage of coupled regulators feature (required for boards using Exynos5422/5800 SoCs) because dev_pm_opp_set_rate() uses regulator_set_voltage_triplet() for setting regulator voltage while the old code used regulator_set_voltage_tol() with fixed tolerance. This patch also removes no longer needed parsing of DT property "exynos,voltage-tolerance" (no Exynos devfreq DT node uses it). After applying changes both functions exynos_bus_passive_target() and exynos_bus_target() have the same code, so remove exynos_bus_passive_target(). In exynos_bus_probe() replace it with exynos_bus_target. Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2019-08-25PM / devfreq: exynos-bus: Correct clock enable sequenceKamil Konieczny
Regulators should be enabled before clocks to avoid h/w hang. This require change in exynos_bus_probe() to move exynos_bus_parse_of() after exynos_bus_parent_parse_of() and change in error handling. Similar change is needed in exynos_bus_exit() where clock should be disabled before regulators. Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Thomas Gleixner
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-16PM / devfreq: exynos-bus: Suspend all devices on system shutdownMarek Szyprowski
Force all Exynos buses to safe operation points before doing the system reboot operation. There are board on which some aggressive power saving operation points are behind the capabilities of the bootloader to properly reset the hardware and boot the board. This way one can avoid board crash early after reboot. This fixes reboot issue on OdroidU3 board both with eMMC and SD boot. Reported-by: Markus Reichl <m.reichl@fivetechno.de> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2017-10-26PM / devfreq: Define the constant governor nameChanwoo Choi
Prior to that, the devfreq device uses the governor name when adding the itself. In order to prevent the mistake used the wrong governor name, this patch defines the governor name as a constant and then uses them instead of using the string directly. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: linux-samsung-soc@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org
2017-02-20Merge branch 'pm-devfreq'Rafael J. Wysocki
* pm-devfreq: PM / devfreq: Modify the device name as devfreq(X) for sysfs PM / devfreq: Simplify the sysfs name of devfreq-event device PM / devfreq: Remove unnecessary separate _remove_devfreq() PM / devfreq: Fix wrong trans_stat of passive devfreq device PM / devfreq: Fix available_governor sysfs PM / devfreq: exynos-ppmu: Show the registred device for ppmu device PM / devfreq: Fix the wrong description for userspace governor PM / devfreq: Fix the checkpatch warnings PM / devfreq: exynos-bus: Print the real clock rate of bus PM / devfreq: exynos-ppmu: Use the regmap interface to handle the registers PM / devfreq: exynos-bus: Add the detailed correlation for Exynos5433 PM / devfreq: Don't delete sysfs group twice
2017-01-31PM / devfreq: exynos-bus: Print the real clock rate of busChanwoo Choi
This patch shows the real clock rate after calling clk_set_rate() to debug it. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2017-01-30PM / OPP: Update OPP users to put referenceViresh Kumar
This patch updates dev_pm_opp_find_freq_*() routines to get a reference to the OPPs returned by them. Also updates the users of dev_pm_opp_find_freq_*() routines to call dev_pm_opp_put() after they are done using the OPPs. As it is guaranteed the that OPPs wouldn't get freed while being used, the RCU read side locking present with the users isn't required anymore. Drop it as well. This patch also updates all users of devfreq_recommended_opp() which was returning an OPP received from the OPP core. Note that some of the OPP core routines have gained rcu_read_{lock|unlock}() calls, as those still use RCU specific APIs within them. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> [Devfreq] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-01-03PM / devfreq: exynos-bus: Fix the wrong return valueChanwoo Choi
This patch fixes the wrong return value. If devfreq driver requires the wrong and non-available governor, it is fail. So, this patch returns the error insead of -EPROBE_DEFER. Fixes: 403e0689d2a9 (PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor) Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-12-08devfreq: exynos: Don't use OPP structures outside of RCU locksViresh Kumar
The OPP structures are abused to the best here, without understanding how the OPP core and RCU locks work. In short, the OPP pointer saved 'struct exynos_bus' can become invalid under your nose, as the OPP core may free it. Fix various abuses around OPP structures and calls. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-07-06PM / devfreq: exynos-bus: add missing of_node_put after calling of_parse_phandlePeter Chen
of_node_put needs to be called when the device node which is got from of_parse_phandle has finished using. [Commit updated to fix an error by MyungJoo] Cc: Chanwoo Choi <cw00.choi@samsung.com> Cc: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Peter Chen <peter.chen@nxp.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-07-06PM / devfreq: exynos: fix error path in exynos_bus_probe()Bartlomiej Zolnierkiewicz
In case of exynos_bus_parse_of() failure the code shouldn't try to remove the OPP table and disable+unprepare bus->clk as it has been already handled in exynos_bus_parse_of(). Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-05-03PM / devfreq: style/typo fixesMyungJoo Ham
- Typo in comments fixed - Unnecessary return statement removed Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-05-03PM / devfreq: exynos: Add support of bus frequency of sub-blocks using ↵Chanwoo Choi
passive governor This patch adds the support of bus frequency feature for sub-blocks which share the one power line. If each bus depends on the power line, each bus is not able to change the voltage by oneself. To optimize the power-consumption on runtime, some buses using the same power line should change the source clock and regulator at the same time. So, this patch uses the passive governor to support the bus frequency for all buses which sharing the one power line. For example, Exynos3250 include the two power line for AXI buses as following: : VDD_MIF : MIF (Memory Interface) provide the DMC (Dynamic Memory Controller) with the power (regulator). : VDD_INT : INT (Internal) provide the various sub-blocks with the power (regulator). Each bus is included in as follwoing block. In the case of VDD_MIF, only DMC bus use the power line. So, there is no any depencency between buese. But, in the case of VDD_INT, various buses share the one power line of VDD_INT. We need to make the depenency between buses. When using passive governor, there is no problem to support the bus frequency as DVFS for all buses. One bus should be operated as the parent bus device which gathering the current load of INT block and then decides the new frequency with some governors except of passive governor. After deciding the new frequency by the parent bus device, the rest bus devices will change the each source clock according to new frequency of the parent bus device. - MIF (Memory Interface) block : VDD_MIF |--- DMC - INT (Internal) block : VDD_INT |--- LEFTBUS (parent) |--- PERIL |--- MFC |--- G3D |--- RIGHTBUS |--- FSYS |--- LCD0 |--- PERIR |--- ISP |--- CAM Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported debugfs error during booting and cw00.choi fix it.] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-05-03PM / devfreq: exynos: Add generic exynos bus frequency driverChanwoo Choi
This patch adds the generic exynos bus frequency driver for AMBA AXI bus of sub-blocks in exynos SoC with DEVFREQ framework. The Samsung Exynos SoC have the common architecture for bus between DRAM and sub-blocks in SoC. This driver can support the generic bus frequency driver for Exynos SoCs. In devicetree, Each bus block has a bus clock, regulator, operation-point and devfreq-event devices which measure the utilization of each bus block. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board] Tested-by: Markus Reichl <m.reichl@fivetechno.de> Tested-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>