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9dd42d019e
linux-stable/drivers/pwm
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Uwe Kleine-König 9dd42d019e pwm: Allow pwm state transitions from an invalid state 
While driving a PWM via the sysfs API it's hard to determine the right
order of writes to the pseudo files "period" and "duty_cycle":

If you want to go from duty_cycle/period = 50/100 to 150/300 you have to
write period first (because 150/100 is invalid). If however you start at
400/500 the duty_cycle must be configured first. The rule that works is:
If you increase period write period first, otherwise write duty_cycle
first. A complication however is that it's usually sensible to configure
the polarity before both period and duty_cycle. This can only be done if
the current state's duty_cycle and period configuration isn't bogus
though. It is still worse (but I think only theoretic) if you have a PWM
that only supports inverted polarity and you start with period = 0 and
polarity = normal. Then you can change neither period (because polarity
= normal is refused) nor polarity (because there is still period = 0).

To simplify the corner cases for userspace, let invalid target states
pass if the current state is invalid already.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20240628103519.105020-2-u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2024-07-10 17:53:52 +02:00
..
core.c pwm: Allow pwm state transitions from an invalid state 2024-07-10 17:53:52 +02:00
Kconfig pwm: Add GPIO PWM driver 2024-07-10 17:52:47 +02:00
Makefile pwm: Add GPIO PWM driver 2024-07-10 17:52:47 +02:00
pwm-ab8500.c pwm: ab8500: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-apple.c pwm: apple: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-atmel-hlcdc.c pwm: atmel-hlcdc: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-atmel-tcb.c pwm: atmel-tcb: Fix race condition and convert to guards 2024-07-10 17:51:04 +02:00
pwm-atmel.c pwm: atmel: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-axi-pwmgen.c pwm: axi-pwmgen: Make use of regmap_clear_bits() 2024-07-10 17:52:46 +02:00
pwm-bcm2835.c pwm: bcm2835: Drop open coded variant of devm_clk_rate_exclusive_get() 2024-04-30 18:57:08 +02:00
pwm-bcm-iproc.c pwm: bcm-iproc: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-bcm-kona.c pwm: bcm-kona: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-berlin.c pwm: berlin: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-brcmstb.c pwm: brcmstb: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-clk.c pwm: clk: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-clps711x.c pwm: clps711x: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:21 +01:00
pwm-crc.c pwm: crc: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:21 +01:00
pwm-cros-ec.c pwm: cros-ec: Simplify device tree xlation 2024-07-10 17:52:47 +02:00
pwm-dwc-core.c pwm: dwc: allow suspend/resume for 16 channels 2024-04-15 17:28:13 +02:00
pwm-dwc.c pwm: dwc: allow suspend/resume for 16 channels 2024-04-15 17:28:13 +02:00
pwm-dwc.h pwm: dwc: allow suspend/resume for 16 channels 2024-04-15 17:28:13 +02:00
pwm-ep93xx.c pwm: ep93xx: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:08 +01:00
pwm-fsl-ftm.c pwm: fsl-ftm: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:09 +01:00
pwm-gpio.c pwm: Add GPIO PWM driver 2024-07-10 17:52:47 +02:00
pwm-hibvt.c pwm: hibvt: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:09 +01:00
pwm-img.c pwm: img: fix pwm clock lookup 2024-03-25 07:31:26 +01:00
pwm-imx1.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-imx27.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-imx-tpm.c pwm: imx-tpm: Enable pinctrl setting for sleep state 2024-07-10 17:53:51 +02:00
pwm-intel-lgm.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-iqs620a.c pwm: iqs620a: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:10 +01:00
pwm-jz4740.c pwm: jz4740: Another few conversions to regmap_{set,clear}_bits() 2024-07-10 17:52:46 +02:00
pwm-keembay.c pwm: keembay: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:10 +01:00
pwm-lp3943.c pwm: lp3943: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:10 +01:00
pwm-lpc18xx-sct.c pwm: lpc18xx-sct: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:11 +01:00
pwm-lpc32xx.c pwm: lpc32xx: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:11 +01:00
pwm-lpss-pci.c pwm: lpss: drop redundant runtime PM handles 2024-07-10 17:53:51 +02:00
pwm-lpss-platform.c pwm: lpss: use devm_pm_runtime_enable() helper 2024-07-10 17:53:51 +02:00
pwm-lpss.c pwm: lpss-*: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:11 +01:00
pwm-lpss.h pwm: lpss-*: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:11 +01:00
pwm-mediatek.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-meson.c pwm: meson: Add support for Amlogic S4 PWM 2024-07-10 17:52:47 +02:00
pwm-microchip-core.c pwm: microchip-core: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-mtk-disp.c pwm: mtk-disp: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-mxs.c pwm: mxs: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-ntxec.c pwm: ntxec: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-omap-dmtimer.c pwm: omap-dmtimer: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-pca9685.c pwm: pca9685: Drop explicit initialization of struct i2c_device_id::driver_data to 0 2024-05-10 07:30:27 +02:00
pwm-pxa.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-raspberrypi-poe.c pwm: raspberrypi-poe: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:13 +01:00
pwm-rcar.c pwm: rcar: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:13 +01:00
pwm-renesas-tpu.c pwm: renesas-tpu: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:13 +01:00
pwm-rockchip.c pwm: rockchip: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:14 +01:00
pwm-rz-mtu3.c pwm: rz-mtu3: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:14 +01:00
pwm-samsung.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-sifive.c pwm: sifive: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:15 +01:00
pwm-sl28cpld.c pwm: sl28cpld: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:15 +01:00
pwm-spear.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-sprd.c pwm: sprd: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:10 +01:00
pwm-sti.c pwm: sti: Prefer local variable over pointer dereference 2024-04-26 21:29:17 +02:00
pwm-stm32-lp.c pwm: stm32-lp: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:25 +01:00
pwm-stm32.c pwm-stm32: Make use of parametrised register definitions 2024-07-10 17:53:51 +02:00
pwm-stmpe.c pwm: stmpe: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:25 +01:00
pwm-sun4i.c pwm: sun4i: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:25 +01:00
pwm-sunplus.c pwm: sunplus: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:25 +01:00
pwm-tegra.c pwm: tegra: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:26 +01:00
pwm-tiecap.c pwm: tiecap: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:26 +01:00
pwm-tiehrpwm.c pwm: tiehrpwm: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:26 +01:00
pwm-twl-led.c pwm: twl-led: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:27 +01:00
pwm-twl.c pwm: twl: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:27 +01:00
pwm-visconti.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-vt8500.c pwm: vt8500: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:27 +01:00
pwm-xilinx.c pwm: xilinx: Simplify using devm_ functions 2024-07-10 17:53:52 +02:00