Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=linux-5.3.y 2019-07-16T16:25:04+00:00 2019-07-16T16:25:04+00:00 Linus Torvalds torvalds@linux-foundation.org 2019-07-16T16:25:04+00:00 urn:sha1:50950626414a982c8ed539128c7f69a3d328a970 Pull backlight updates from Lee Jones: "New Functionality: - Provide support for ACPI enumeration; gpio_backlight Fix-ups: - SPDX fixups; pwm_bl - Fix linear brightness levels to include number available; pwm_bl" * tag 'backlight-next-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight: backlight: pwm_bl: Fix heuristic to determine number of brightness levels backlight: gpio_backlight: Enable ACPI enumeration backlight: pwm_bl: Convert to use SPDX identifier 2019-06-27T06:09:05+00:00 Andy Shevchenko andriy.shevchenko@linux.intel.com 2019-06-19T15:21:27+00:00 urn:sha1:98b7404eb7d64e55f8fdd419cb3965a8abf0e217 ACPI allows to enumerate specific devices by using compatible strings. Enable that enumeration for GPIO based backlight devices. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2019-06-19T15:09:55+00:00 Thomas Gleixner tglx@linutronix.de 2019-06-04T08:11:33+00:00 urn:sha1:d2912cb15bdda8ba4a5dd73396ad62641af2f520 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> 2017-08-07T16:11:28+00:00 Linus Walleij linus.walleij@linaro.org 2017-05-30T11:48:22+00:00 urn:sha1:2606706e4d7b89ebf13f35895a7dfe00e394e782 The option to invert the output of the GPIO (active low) is not used by the only platform still using platform data to set up a GPIO backlight (one SH board). Delete the option as we do not expect to expand the use of board files for this driver, and GPIO descriptors intrinsically keep track of any signal inversion. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2017-08-07T16:04:32+00:00 Linus Walleij linus.walleij@linaro.org 2017-05-30T11:48:21+00:00 urn:sha1:de7389003ab77fc63296b2adee4cd9c48dc41d5a This driver is predominantly used by device tree systems, all of which can deal with modern GPIO descriptors. The legacy GPIO API is only used by one SH board so make the GPIO descriptor the default way to deal with it. As an intended side effect we do not need to look around in the device tree for the inversion flag since the GPIO descriptors will intrinsically deal with this. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2016-01-11T07:58:35+00:00 Stefan Agner stefan@agner.ch 2015-10-23T23:44:43+00:00 urn:sha1:2f4647a149943b1f87e46858e9f13e02010347f7 There are situations where the backlight should be on at boot time (e.g. if the boot loader already turned the display on). The DT bindings specify the "default-on" property for that purpose. Currently, the initial state of the GPIO at request time is always set to logical off (high or low depending on whether it is an active high or low GPIO). Since the GPIO is requested as an output, the GPIO will be driven low for a short period of time, which leads to a flickering display in the above use-case. Initialize the GPIO depending on the default-on property to be logical on or off. Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2015-06-23T14:28:46+00:00 Arun Bharadwaj arun@gumstix.com 2015-04-16T00:21:24+00:00 urn:sha1:4d866723d3e4f11b2e4b4f166f115f830bf5e481 The gpio-backlight driver seems to be missing the MODULE_DEVICE_TABLE line which is preventing it from being modprobed during boot time even if the gpio-backlight device exists. This seems to be a bug and this patch attempts to fix that. Signed-off-by: Arun Bharadwaj <arun@gumstix.com> Signed-off-by: Ash Charles <ashcharles@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2014-08-28T13:09:48+00:00 Peter Griffin peter.griffin@linaro.org 2014-08-13T12:38:38+00:00 urn:sha1:6728f2b109392484d38ac9e365496ac5fa1071f1 This patch removes the superflous .owner field for drivers which use the module_platform_driver or platform_driver_register api, as this is overriden in __platform_driver_register. Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2014-06-23T12:24:22+00:00 Andrzej Hajda a.hajda@samsung.com 2014-05-30T10:10:50+00:00 urn:sha1:a5d8e2e73c7f1dcee485d55225628317d8d441c0 Since backlight core returns props.brightness in case get_brightness is not implemented trivial implementations are not needed anymore. Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 2014-06-05T09:00:53+00:00 Tony Lindgren tony@atomide.com 2014-05-09T01:24:55+00:00 urn:sha1:ab1e59b4dc0370734ab3afb8de0c10a6f5a211ad If the GPIO for the backlight is on an I2C chip, we currently get nasty warnings like this during the boot: WARNING: CPU: 0 PID: 6 at drivers/gpio/gpiolib.c:2364 gpiod_set_raw_value+0x40/0x4c() Modules linked in: CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 3.15.0-rc4-12393-gcde9f4e #400 Workqueue: deferwq deferred_probe_work_func [<c0014cbc>] (unwind_backtrace) from [<c001191c>] (show_stack+0x10/0x14) [<c001191c>] (show_stack) from [<c0566ae0>] (dump_stack+0x80/0x9c) [<c0566ae0>] (dump_stack) from [<c003f61c>] (warn_slowpath_common+0x68/0x8c) [<c003f61c>] (warn_slowpath_common) from [<c003f65c>] (warn_slowpath_null+0x1c/0x24) [<c003f65c>] (warn_slowpath_null) from [<c02f7e10>] (gpiod_set_raw_value+0x40/0x4c) [<c02f7e10>] (gpiod_set_raw_value) from [<c0308fbc>] (gpio_backlight_update_status+0x4c/0x74) [<c0308fbc>] (gpio_backlight_update_status) from [<c030914c>] (gpio_backlight_probe+0x168/0x254) [<c030914c>] (gpio_backlight_probe) from [<c0378fa8>] (platform_drv_probe+0x18/0x48) [<c0378fa8>] (platform_drv_probe) from [<c0377c40>] (driver_probe_device+0x10c/0x238) [<c0377c40>] (driver_probe_device) from [<c0376330>] (bus_for_each_drv+0x44/0x8c) [<c0376330>] (bus_for_each_drv) from [<c0377afc>] (device_attach+0x74/0x8c) [<c0377afc>] (device_attach) from [<c03771c4>] (bus_probe_device+0x88/0xb0) [<c03771c4>] (bus_probe_device) from [<c03775c8>] (deferred_probe_work_func+0x64/0x94) [<c03775c8>] (deferred_probe_work_func) from [<c00572e8>] (process_one_work+0x1b4/0x4bc) [<c00572e8>] (process_one_work) from [<c00579d0>] (worker_thread+0x11c/0x398) [<c00579d0>] (worker_thread) from [<c005dfd8>] (kthread+0xc8/0xe4) [<c005dfd8>] (kthread) from [<c000e768>] (ret_from_fork+0x14/0x2c) Fix this by using gpio_set_value_cansleep() as suggested in drivers/gpio/gpiolib.c:2364. This is what the other backlight drivers are also doing. Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>