AngeloGioacchino Del Regno 1cccf7c5c7 pwm: mtk-disp: Configure double buffering before reading in .get_state() ... [ Upstream commit b16c310115 ] The DISP_PWM controller's default behavior is to always use register double buffering: all reads/writes are then performed on shadow registers instead of working registers and this becomes an issue in case our chosen configuration in Linux is different from the default (or from the one that was pre-applied by the bootloader). An example of broken behavior is when the controller is configured to use shadow registers, but this driver wants to configure it otherwise: what happens is that the .get_state() callback is called right after registering the pwmchip and checks whether the PWM is enabled by reading the DISP_PWM_EN register; At this point, if shadow registers are enabled but their content was not committed before booting Linux, we are *not* reading the current PWM enablement status, leading to the kernel knowing that the hardware is actually enabled when, in reality, it's not. The aforementioned issue emerged since this driver was fixed with commit 0b5ef3429d ("pwm: mtk-disp: Fix the parameters calculated by the enabled flag of disp_pwm") making it to read the enablement status from the right register. Configure the controller in the .get_state() callback to avoid this desync issue and get the backlight properly working again. Fixes: 3f2b167349 ("pwm: mtk-disp: Implement atomic API .get_state()") Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com> Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com> Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com> Tested-by: Alexandre Mergnat <amergnat@baylibre.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-05-11 23:00:38 +09:00
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Kconfig	…
Makefile	…
core.c	…
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: cros-ec: Explicitly set .polarity in .get_state()	2023-04-13 16:48:17 +02:00
pwm-dwc.c	…
pwm-ep93xx.c	…
pwm-fsl-ftm.c	…
pwm-hibvt.c	pwm: hibvt: Explicitly set .polarity in .get_state()	2023-04-26 13:51:55 +02:00
pwm-img.c	…
pwm-imx-tpm.c	…
pwm-imx1.c	…
pwm-imx27.c	…
pwm-intel-lgm.c	…
pwm-iqs620a.c	pwm: iqs620a: Explicitly set .polarity in .get_state()	2023-04-26 13:51:55 +02:00
pwm-jz4740.c	…
pwm-keembay.c	…
pwm-lp3943.c	…
pwm-lpc18xx-sct.c	pwm: lpc18xx: Fix period handling	2022-08-17 14:23:16 +02:00
pwm-lpc32xx.c	…
pwm-lpss-pci.c	…
pwm-lpss-platform.c	…
pwm-lpss.c	…
pwm-lpss.h	…
pwm-mediatek.c	pwm: mediatek: always use bus clock for PWM on MT7622	2022-12-31 13:14:36 +01:00
pwm-meson.c	pwm: meson: Fix g12a ao clk81 name	2023-05-11 23:00:17 +09:00
pwm-mtk-disp.c	pwm: mtk-disp: Configure double buffering before reading in .get_state()	2023-05-11 23:00:38 +09:00
pwm-mxs.c	…
pwm-ntxec.c	…
pwm-omap-dmtimer.c	…
pwm-pca9685.c	…
pwm-pxa.c	…
pwm-raspberrypi-poe.c	…
pwm-rcar.c	…
pwm-renesas-tpu.c	…
pwm-rockchip.c	…
pwm-samsung.c	…
pwm-sifive.c	pwm: sifive: Always let the first pwm_apply_state succeed	2023-03-11 13:57:23 +01:00
pwm-sl28cpld.c	…
pwm-spear.c	…
pwm-sprd.c	pwm: sprd: Explicitly set .polarity in .get_state()	2023-04-13 16:48:17 +02:00
pwm-sti.c	…
pwm-stm32-lp.c	pwm: stm32-lp: fix the check on arr and cmp registers update	2023-03-11 13:57:23 +01:00
pwm-stm32.c	…
pwm-stmpe.c	…
pwm-sun4i.c	…
pwm-tegra.c	pwm: tegra: Fix 32 bit build	2022-12-31 13:14:48 +01:00
pwm-tiecap.c	…
pwm-tiehrpwm.c	…
pwm-twl-led.c	…
pwm-twl.c	…
pwm-visconti.c	…
pwm-vt8500.c	…
sysfs.c	…