Merge tag 'acpi-5.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more ACPI updates from Rafael Wysocki:
 "Additional ACPI updates.

  These update the ACPICA code in the kernel to the 20200326 upstream
  revision, fix an ACPI-related CPU hotplug deadlock on x86, update
  Intel Tiger Lake device IDs in some places, add a new ACPI backlight
  blacklist entry, update the "acpi_backlight" kernel command line
  switch documentation and clean up a CPPC library routine.

  Specifics:

   - Update the ACPICA code in the kernel to upstream revision 20200326
     including:
      * Fix for a typo in a comment field (Bob Moore)
      * acpiExec namespace init file fixes (Bob Moore)
      * Addition of NHLT to the known tables list (Cezary Rojewski)
      * Conversion of PlatformCommChannel ASL keyword to PCC (Erik
        Kaneda)
      * acpiexec cleanup (Erik Kaneda)
      * WSMT-related typo fix (Erik Kaneda)
      * sprintf() utility function fix (John Levon)
      * IVRS IVHD type 11h parsing implementation (Michał Żygowski)
      * IVRS IVHD type 10h reserved field name fix (Michał Żygowski)

   - Fix ACPI-related CPU hotplug deadlock on x86 (Qian Cai)

   - Fix Intel Tiger Lake ACPI device IDs in several places (Gayatri
     Kammela)

   - Add ACPI backlight blacklist entry for Acer Aspire 5783z (Hans de
     Goede)

   - Fix documentation of the "acpi_backlight" kernel command line
     switch (Randy Dunlap)

   - Clean up the acpi_get_psd_map() CPPC library routine (Liguang
     Zhang)"

* tag 'acpi-5.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  x86: ACPI: fix CPU hotplug deadlock
  thermal: int340x_thermal: fix: Update Tiger Lake ACPI device IDs
  platform/x86: intel-hid: fix: Update Tiger Lake ACPI device ID
  ACPI: Update Tiger Lake ACPI device IDs
  ACPI: video: Use native backlight on Acer Aspire 5783z
  ACPI: video: Docs update for "acpi_backlight" kernel parameter options
  ACPICA: Update version 20200326
  ACPICA: Fixes for acpiExec namespace init file
  ACPICA: Add NHLT table signature
  ACPICA: WSMT: Fix typo, no functional change
  ACPICA: utilities: fix sprintf()
  ACPICA: acpiexec: remove redeclaration of acpi_gbl_db_opt_no_region_support
  ACPICA: Change PlatformCommChannel ASL keyword to PCC
  ACPICA: Fix IVRS IVHD type 10h reserved field name
  ACPICA: Implement IVRS IVHD type 11h parsing
  ACPICA: Fix a typo in a comment field
  ACPI: CPPC: clean up acpi_get_psd_map()

1 files changed, 5 insertions, 3 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index c78b463f5f79..2d31d811a52d 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -22,11 +22,13 @@
 			default: 0
 
 	acpi_backlight=	[HW,ACPI]
-			acpi_backlight=vendor
-			acpi_backlight=video
-			If set to vendor, prefer vendor specific driver
+			{ vendor | video | native | none }
+			If set to vendor, prefer vendor-specific driver
 			(e.g. thinkpad_acpi, sony_acpi, etc.) instead
 			of the ACPI video.ko driver.
+			If set to video, use the ACPI video.ko driver.
+			If set to native, use the device's native backlight mode.
+			If set to none, disable the ACPI backlight interface.
 
 	acpi_force_32bit_fadt_addr
 			force FADT to use 32 bit addresses rather than the