kernel/git/stable/linux.git/drivers/video/backlight, branch linux-7.2.y

backlight: ktd2801: Fix unmet dependency on GPIOLIB

2026-09-14T11:40:42+00:00

[ Upstream commit 5859fa79c7d85d0c242a9a1ffb40bab9732d4ef1 ] LEDS_EXPRESSWIRE depends on GPIOLIB, so its selector, BACKLIGHT_KTD2801 also needs to ensure GPIOLIB is enabled. Otherwise: WARNING: unmet direct dependencies detected for LEDS_EXPRESSWIRE Depends on [n]: NEW_LEDS [=n] && GPIOLIB [=n] Selected by [y]: - BACKLIGHT_KTD2801 [=y] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE [=y] This unmet dependency was found by kconfirm, a static analysis tool for Kconfig. Fixes: d95963e309bc ("backlight: ktd2801: Depend on GPIOLIB") Signed-off-by: Julian Braha Reviewed-by: Daniel Thompson (RISCstar) Acked-by: Duje Mihanović Tested-by: Randy Dunlap Acked-by: Randy Dunlap Link: https://patch.msgid.link/20260719024902.151710-1-julianbraha@gmail.com Signed-off-by: Lee Jones Signed-off-by: Sasha Levin

backlight: aw99706: Validate all DT property values consistently

2026-09-14T11:40:42+00:00

[ Upstream commit 3d142b19b09ea62d6e9a33d46d1b858b3ad05707 ] The lookup helpers for dim-mode and ramp-ctl take a shortcut when lookup_tbl is NULL: they accept any u32 value without range-checking and return success unconditionally. Out-of-range values get silently truncated by regmap_update_bits instead of triggering the dev_warn + default-fallback path that the other properties use. Add a field-width check for the NULL-table case so that values exceeding the register field maximum are rejected the same way a table-lookup miss is. The switching frequency table has a second hole: reserved slots use 0 as their marker, so "awinic,sw-freq-hz = <0>" matches slot 0 and programs a reserved encoding. Make the reserved marker U32_MAX and skip such slots during lookup. While here, also switch the error returns to -EINVAL for consistency. Fixes: 147b38a5ad06 ("backlight: aw99706: Add support for Awinic AW99706 backlight") Signed-off-by: Junjie Cao Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260804030255.1934470-3-junjie.cao@intel.com Signed-off-by: Lee Jones Signed-off-by: Sasha Levin

backlight: aw99706: Honor the core blank state in update_status()

2026-09-07T15:36:55+00:00

commit fbf8b5d251e8b4e1b01c591be313c63cb9e1526a upstream. update_status() passes props.brightness straight to the hardware and ignores the power/blank state tracked by the core. Writing 4 to the bl_power sysfs attribute or blanking the framebuffer therefore leaves the backlight lit. Use backlight_get_brightness(), which returns 0 while the device is blanked. Fixes: 147b38a5ad06 ("backlight: aw99706: Add support for Awinic AW99706 backlight") Cc: stable@vger.kernel.org Signed-off-by: Junjie Cao Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260804030255.1934470-4-junjie.cao@intel.com Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman

backlight: aw99706: Fix DT property names to match binding

2026-09-07T15:36:55+00:00

commit daf120e464386f750b3870dc04d5bc6a786f0000 upstream. The driver reads four tuning properties without the unit suffixes that the binding mandates: "awinic,sw-freq" instead of "awinic,sw-freq-hz", "awinic,sw-ilmt" instead of "awinic,sw-ilmt-microamp", "awinic,iled-max" instead of "awinic,iled-max-microamp", and "awinic,uvlo-thres" instead of "awinic,uvlo-thres-microvolt". As a result, device_property_read_u32() never finds these properties in a binding-conformant device tree and silently falls back to the compiled-in defaults for switching frequency, switching current limit, max LED current, and UVLO threshold. Fix by aligning the property name strings in aw99706_dt_props[] with the binding. No value/range changes are needed since both sides already use the same units and enumerations. Fixes: 147b38a5ad06 ("backlight: aw99706: Add support for Awinic AW99706 backlight") Cc: stable@vger.kernel.org Signed-off-by: Junjie Cao Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260804030255.1934470-2-junjie.cao@intel.com Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman

Replace by more specific (c files)

2026-07-03T05:38:17+00:00

Replace the #include of by the more specific where applicable. For most cases the include can be dropped completely, only a few drivers need one or two headers added. Acked-by: Danilo Krummrich Acked-by: Takashi Sakamoto Acked-by: Bjorn Helgaas Link: https://patch.msgid.link/1a3f2007c5c5dcf555c09a4035ce3ae8ef1b6c49.1782808461.git.u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König (The Capable Hub)

backlight: Use named initializers for arrays of i2c_device_data

2026-06-11T14:12:12+00:00

While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. While touching all these arrays, unify usage of whitespace in the list terminator. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260518111203.639603-2-u.kleine-koenig@baylibre.com Signed-off-by: Lee Jones

backlight: cgbc: Remove redundant X86 dependency

2026-05-07T13:25:19+00:00

The backlight driver depends on the MFD cgbc-core driver, which already depends on X86. The explicit X86 dependency for the backlight driver is redundant and can be safely removed. Signed-off-by: Thomas Richard Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260427-backlight-cgbc-remove-x86-dependency-v2-1-da9f2375a34a@bootlin.com Signed-off-by: Lee Jones

backlight: Add max25014atg backlight

2026-04-30T13:54:34+00:00

The Maxim MAX25014 is a 4-channel automotive grade backlight driver IC with integrated boost controller. Signed-off-by: Maud Spierings Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260407-max25014-v8-2-14eac7ed673a@gocontroll.com Signed-off-by: Lee Jones

backlight: ktd2801: Enable BL_CORE_SUSPENDRESUME

2026-04-30T13:34:38+00:00

Boards using this backlight chip do not power the backlight off on suspend. Enable BL_CORE_SUSPENDRESUME so the chip gets powered off by the backlight core on suspend. Tested on samsung,coreprimevelte. Cc: stable@vger.kernel.org # v6.19 Signed-off-by: Duje Mihanović Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260328-ktd2801-pm-fix-v1-1-007cb103faeb@dujemihanovic.xyz Signed-off-by: Lee Jones

backlight: apple_bl: Convert to a platform driver

2026-03-31T10:48:10+00:00

In all cases in which a struct acpi_driver is used for binding a driver to an ACPI device object, a corresponding platform device is created by the ACPI core and that device is regarded as a proper representation of underlying hardware. Accordingly, a struct platform_driver should be used by driver code to bind to that device. There are multiple reasons why drivers should not bind directly to ACPI device objects [1]. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the Apple Backlight ACPI driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Link: https://lore.kernel.org/all/2396510.ElGaqSPkdT@rafael.j.wysocki/ [1] Signed-off-by: Rafael J. Wysocki Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/5084777.GXAFRqVoOG@rafael.j.wysocki Signed-off-by: Lee Jones