Uwe Kleine-König e47685ec4c pwm: iqs620a: Fix overflow and optimize calculations ... [ Upstream commit 72d6b2459dbd539c1369149e501fdc3dc8ddef16 ] If state->duty_cycle is 0x100000000000000, the previous calculation of duty_scale overflows and yields a duty cycle ratio of 0% instead of 100%. Fix this by clamping the requested duty cycle to the maximal possible duty cycle first. This way it is possible to use a native integer division instead of a (depending on the architecture) more expensive 64bit division. With this change in place duty_scale cannot be bigger than 256 which allows to simplify the calculation of duty_val. Fixes: 6f0841a819 ("pwm: Add support for Azoteq IQS620A PWM generator") Tested-by: Jeff LaBundy <jeff@labundy.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-03-04 11:38:17 +01:00
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core.c
Kconfig
Makefile
pwm-ab8500.c
pwm-atmel-hlcdc.c
pwm-atmel-tcb.c
pwm-atmel.c
pwm-bcm-iproc.c
pwm-bcm-kona.c
pwm-bcm2835.c
pwm-berlin.c
pwm-brcmstb.c
pwm-clps711x.c
pwm-crc.c
pwm-cros-ec.c
pwm-ep93xx.c
pwm-fsl-ftm.c
pwm-hibvt.c
pwm-img.c
pwm-imx-tpm.c
pwm-imx1.c
pwm-imx27.c
pwm-iqs620a.c	pwm: iqs620a: Fix overflow and optimize calculations	2021-03-04 11:38:17 +01:00
pwm-jz4740.c
pwm-lp3943.c
pwm-lpc18xx-sct.c
pwm-lpc32xx.c
pwm-lpss-pci.c
pwm-lpss-platform.c
pwm-lpss.c
pwm-lpss.h
pwm-mediatek.c
pwm-meson.c
pwm-mtk-disp.c
pwm-mxs.c
pwm-omap-dmtimer.c
pwm-pca9685.c
pwm-pxa.c
pwm-rcar.c
pwm-renesas-tpu.c
pwm-rockchip.c
pwm-samsung.c
pwm-sifive.c
pwm-sl28cpld.c
pwm-spear.c
pwm-sprd.c
pwm-sti.c
pwm-stm32-lp.c
pwm-stm32.c
pwm-stmpe.c
pwm-sun4i.c
pwm-tegra.c
pwm-tiecap.c
pwm-tiehrpwm.c
pwm-twl-led.c
pwm-twl.c
pwm-vt8500.c
pwm-zx.c
sysfs.c