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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-24 21:24:00 +08:00
linux-next/drivers/clk
Nicolas Pitre 0bfa0820c2 PM: clk: make PM clock layer compatible with clocks that must sleep
The clock API splits its interface into sleepable ant atomic contexts:

 - clk_prepare/clk_unprepare for stuff that might sleep

 - clk_enable_clk_disable for anything that may be done in atomic context

The code handling runtime PM for clocks only calls clk_disable() on
suspend requests, and clk_enable on resume requests. This means that
runtime PM with clock providers that only have the prepare/unprepare
methods implemented is basically useless.

Many clock implementations can't accommodate atomic contexts. This is
often the case when communication with the clock happens through another
subsystem like I2C or SCMI.

Let's make the clock PM code useful with such clocks by safely invoking
clk_prepare/clk_unprepare upon resume/suspend requests. Of course, when
such clocks are registered with the PM layer then pm_runtime_irq_safe()
can't be used, and neither pm_runtime_suspend() nor pm_runtime_resume()
may be invoked in atomic context.

For clocks that do implement the enable and disable methods then
everything just works as before.

A note on sparse:
According to https://lwn.net/Articles/109066/ there are things
that sparse can't cope with. In particular, pm_clk_op_lock() and
pm_clk_op_unlock() may or may not lock/unlock psd->lock depending on
some runtime condition. To work around that we tell it the lock is
always untaken for the purpose of static analisys.

Thanks to Naresh Kamboju for reporting issues with the initial patch.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-01-27 19:29:32 +01:00
..
actions clk: actions: Add Actions S500 SoC Reset Management Unit support 2020-07-21 01:50:47 -07:00
analogbits
at91 clk: at91: sam9x60: remove atmel,osc-bypass support 2020-12-19 15:33:00 -08:00
axis treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
axs10x clk: axs10x: use devm_platform_ioremap_resource() to simplify code 2019-10-16 16:17:50 -07:00
baikal-t1 clk: baikal-t1: Mark Ethernet PLL as critical 2020-10-13 19:48:34 -07:00
bcm clk: bcm: dvp: Add MODULE_DEVICE_TABLE() 2020-12-19 11:48:29 -08:00
berlin
davinci This pull request contains zero diff to the core framework. It is a collection 2020-10-22 12:53:28 -07:00
h8300
hisilicon Merge branches 'clk-hisi', 'clk-amlogic', 'clk-samsung', 'clk-renesas' and 'clk-imx' into clk-next 2019-11-27 08:14:17 -08:00
imgtec treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
imx The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
ingenic clk: ingenic: Fix divider calculation with div tables 2020-12-19 16:04:58 -08:00
keystone clk: keystone: sci-clk: add 10% slack to set_rate 2020-09-22 12:58:52 -07:00
loongson1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mediatek clk: mediatek: Make mtk_clk_register_mux() a static function 2020-12-17 00:41:54 -08:00
meson The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
microchip clk: let init callback return an error code 2019-12-23 18:53:13 -08:00
mmp Merge branches 'clk-semicolon', 'clk-axi-clkgen', 'clk-qoriq', 'clk-baikal', 'clk-const' and 'clk-mmp2' into clk-next 2020-10-20 11:47:02 -07:00
mvebu clk: mvebu: a3700: fix the XTAL MODE pin to MPP1_9 2020-12-19 15:51:18 -08:00
mxs treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 159 2019-05-30 11:26:37 -07:00
nxp treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 159 2019-05-30 11:26:37 -07:00
pistachio treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 422 2019-06-05 17:37:15 +02:00
pxa clk: pxa: Constify static struct clk_ops 2020-10-13 19:49:11 -07:00
qcom The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
renesas The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
rockchip clk: rockchip: fix i2s gate bits on rk3066 and rk3188 2020-11-29 20:10:45 +01:00
samsung The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
sifive clk: sifive: Add clock enable and disable ops 2020-12-16 12:23:13 -08:00
sirf clk: clk-prima2: fix return value check in prima2_clk_init() 2020-10-13 19:54:30 -07:00
socfpga This pull request contains zero diff to the core framework. It is a collection 2020-10-22 12:53:28 -07:00
spear clk: spear: Remove uninitialized_var() usage 2020-07-16 12:32:26 -07:00
sprd This time around we have 4 lines of diff in the core framework, removing a 2020-06-10 11:42:19 -07:00
st clk: st: Remove uninitialized_var() usage 2020-07-16 12:32:25 -07:00
sunxi clk: sunxi: Fix incorrect usage of round_down() 2020-04-14 09:21:05 +02:00
sunxi-ng clk: sunxi-ng: Make sure divider tables have sentinel 2020-12-19 15:54:02 -08:00
tegra clk: tegra30: Add hda clock default rates to clock driver 2021-01-12 14:43:53 +01:00
ti The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
uniphier clk: uniphier: use semicolons rather than commas to separate statements 2020-10-13 17:43:03 -07:00
ux500 clk: ux500: Fix up the SGA clock for some variants 2020-01-04 23:27:15 -08:00
versatile clk: versatile: Add of_node_put() before return statement 2020-09-10 00:57:42 -07:00
x86 More ACPI updates for 5.9-rc1 2020-08-15 08:18:22 -07:00
zte clk: zx296718: Don't reference clk_init_data after registration 2019-08-16 10:20:15 -07:00
zynq treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 401 2019-06-05 17:37:13 +02:00
zynqmp This time around we have 4 lines of diff in the core framework, removing a 2020-06-10 11:42:19 -07:00
clk-asm9260.c clk: asm9260: fix __clk_hw_register_fixed_rate_with_accuracy typo 2020-04-13 12:20:06 -07:00
clk-aspeed.c clk: aspeed: Add RMII RCLK gates for both AST2500 MACs 2019-11-26 10:02:48 -08:00
clk-aspeed.h clk: aspeed: Move structures to header 2019-09-06 15:17:02 -07:00
clk-ast2600.c clk: AST2600: Add mux for EMMC clock 2020-07-11 09:15:33 -07:00
clk-axi-clkgen.c clk: axi-clkgen: move the OF table at the bottom of the file 2020-12-17 01:52:54 -08:00
clk-axm5516.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
clk-bd718x7.c clk: bd718x7: Support ROHM BD71828 clk block 2020-01-24 07:22:47 +00:00
clk-bm1880.c clk: bm1800: Remove set but not used variable 'fref' 2019-12-24 00:10:33 -08:00
clk-bulk.c clk: Make clk_bulk_get_all() return a valid "id" 2019-09-17 13:26:31 -07:00
clk-cdce706.c Replace HTTP links with HTTPS ones: Common CLK framework 2020-07-10 17:15:34 -07:00
clk-cdce925.c clk: clk-cdce925: Add regulator support 2019-09-06 10:31:16 -07:00
clk-clps711x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
clk-composite.c clk: composite: add devm_clk_hw_register_composite_pdata() 2020-12-07 14:06:16 -08:00
clk-conf.c
clk-cs2000-cp.c
clk-devres.c clk: Add devm_clk_bulk_get_optional() function 2019-06-25 14:28:01 -07:00
clk-divider.c clk: divider: add devm_clk_hw_register_divider_table() 2020-12-07 16:53:39 -08:00
clk-efm32gg.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
clk-fixed-factor.c clk: fixed: add missing kerneldoc 2020-09-22 12:44:14 -07:00
clk-fixed-mmio.c
clk-fixed-rate.c clk: fixed: add missing kerneldoc 2020-09-22 12:44:14 -07:00
clk-fractional-divider.c
clk-fsl-flexspi.c clk: fsl-flexspi: new driver 2020-12-07 16:56:41 -08:00
clk-fsl-sai.c clk: fsl-sai: use devm_clk_hw_register_composite_pdata() 2020-12-07 14:06:16 -08:00
clk-gate.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
clk-gemini.c
clk-gpio.c Replace HTTP links with HTTPS ones: Common CLK framework 2020-07-10 17:15:34 -07:00
clk-hi655x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
clk-highbank.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
clk-hsdk-pll.c CLK: HSDK: CGU: add support for 148.5MHz clock 2020-05-28 21:06:39 -07:00
clk-lochnagar.c clk: lochnagar: Don't reference clk_init_data after registration 2019-08-16 10:20:07 -07:00
clk-max9485.c
clk-max77686.c
clk-milbeaut.c clk: milbeaut: Don't reference clk_init_data after registration 2019-08-16 10:20:15 -07:00
clk-moxart.c
clk-multiplier.c
clk-mux.c clk: mux: Add support for specifying parents via DT/pointers 2020-01-06 23:10:05 -08:00
clk-nomadik.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
clk-npcm7xx.c
clk-nspire.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
clk-oxnas.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
clk-palmas.c
clk-plldig.c clk: ls1028a: fix a dereference of pointer 'parent' before a null check 2020-02-03 23:03:49 -08:00
clk-pwm.c clk: pwm: drop of_match_ptr from of_device_id table 2020-12-10 12:24:18 -08:00
clk-qoriq.c clk: qoriq: provide constants for the type 2020-12-07 16:53:30 -08:00
clk-rk808.c - Core Frameworks 2019-07-15 20:18:40 -07:00
clk-s2mps11.c clk: s2mps11: Fix a resource leak in error handling paths in the probe function 2020-12-19 15:53:31 -08:00
clk-scmi.c clk: scmi: Fix min and max rate when registering clocks with discrete rates 2020-07-13 09:40:21 +01:00
clk-scpi.c clk: scpi: mark scpi_clk_match as maybe unused 2020-12-10 12:24:40 -08:00
clk-si514.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
clk-si544.c clk: clk-si544: Implement small frequency change support 2019-06-27 13:45:38 -07:00
clk-si570.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
clk-si5341.c clk: si5341: drop unused 'err' variable 2020-09-22 12:44:41 -07:00
clk-si5351.c clk: si5351: Wait for bit clear after PLL reset 2020-12-19 15:49:54 -08:00
clk-si5351.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
clk-sparx5.c clk: sparx5: Add Sparx5 SoC DPLL clock driver 2020-07-28 18:17:56 -07:00
clk-stm32f4.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
clk-stm32h7.c
clk-stm32mp1.c
clk-tango4.c
clk-twl6040.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 336 2019-06-05 17:37:07 +02:00
clk-u300.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
clk-versaclock5.c clk: vc5: Use "idt,voltage-microvolt" instead of "idt,voltage-microvolts" 2020-12-19 16:08:51 -08:00
clk-vt8500.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-wm831x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
clk-xgene.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
clk.c PM: clk: make PM clock layer compatible with clocks that must sleep 2021-01-27 19:29:32 +01:00
clk.h clk: consoldiate the __clk_get_hw() declarations 2019-07-12 11:00:14 -07:00
clkdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
Kconfig clk: fsl-flexspi: new driver 2020-12-07 16:56:41 -08:00
Makefile clk: fsl-flexspi: new driver 2020-12-07 16:56:41 -08:00