From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965606AbcAURFz (ORCPT ); Thu, 21 Jan 2016 12:05:55 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:48693 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965302AbcAURFw (ORCPT ); Thu, 21 Jan 2016 12:05:52 -0500 From: Colin King To: Jonathan Corbet , "Rafael J . Wysocki" , linux-doc@vger.kernel.org, linux-acpi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH] ACPI / tables: Add acpi_force_32bit_fadt_addr option to force 32 bit FADT addresses Date: Thu, 21 Jan 2016 17:05:47 +0000 Message-Id: <1453395947-1567-1-git-send-email-colin.king@canonical.com> X-Mailer: git-send-email 2.7.0.rc3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King BugLink: https://bugs.launchpad.net/bugs/1529381 Some HP laptops seem to have invalid 64 bit FADT X_PM* addresses which are causing various boot issues. In these cases, it would be useful to force ACPI to use the valid legacy 32 bit equivalent PM addresses. Add a acpi_force_32bit_fadt_addr to set the ACPICA acpi_gbl_use32_bit_fadt_addresses to TRUE to force this override. Signed-off-by: Colin Ian King --- Documentation/kernel-parameters.txt | 6 ++++++ drivers/acpi/tables.c | 10 ++++++++++ 2 files changed, 16 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 3ea869d..3782024 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -193,6 +193,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver. + acpi_force_32bit_fadt_addr + force FADT to use 32 bit addresses rather than the + 64 bit X_* addresses. Some firmware have broken 64 + bit addresses for force ACPI ignore these and use + the older legacy 32 bit addresses. + acpica_no_return_repair [HW, ACPI] Disable AML predefined validation mechanism This mechanism can repair the evaluation result to make diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index 6c0f079..ebdf564 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -484,3 +484,13 @@ static int __init acpi_force_table_verification_setup(char *s) } early_param("acpi_force_table_verification", acpi_force_table_verification_setup); + +static int __init acpi_force_32bit_fadt_addr(char *s) +{ + pr_info("Forcing 32 Bit FADT addresses\n"); + acpi_gbl_use32_bit_fadt_addresses = TRUE; + + return 0; +} + +early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); -- 1.9.1