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author | Thorsten Leemhuis <fedora@leemhuis.info> | 2019-07-09 21:08:25 +0200 |
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committer | Thorsten Leemhuis <fedora@leemhuis.info> | 2019-07-09 21:08:25 +0200 |
commit | 959cd3ad26748801b73a3025b9c2835dc70e644c (patch) | |
tree | f0207748ce26b75a2e277846574a98924acf7eac /arm64-acpi-ignore-5.1-fadts-reported-as-5.0.patch | |
parent | bb30288ad29d581b4c12c1daf39cd1b265bf254d (diff) | |
parent | 5c2ab4e801af208f640dc06a07e6a55cca2c1d74 (diff) | |
download | kernel-959cd3ad26748801b73a3025b9c2835dc70e644c.tar.gz kernel-959cd3ad26748801b73a3025b9c2835dc70e644c.tar.xz kernel-959cd3ad26748801b73a3025b9c2835dc70e644c.zip |
merge origin, 5.2.0
Diffstat (limited to 'arm64-acpi-ignore-5.1-fadts-reported-as-5.0.patch')
-rw-r--r-- | arm64-acpi-ignore-5.1-fadts-reported-as-5.0.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arm64-acpi-ignore-5.1-fadts-reported-as-5.0.patch b/arm64-acpi-ignore-5.1-fadts-reported-as-5.0.patch new file mode 100644 index 000000000..6cf0ba926 --- /dev/null +++ b/arm64-acpi-ignore-5.1-fadts-reported-as-5.0.patch @@ -0,0 +1,41 @@ +From a7edc17544709d20f800dc0898096365a3d68613 Mon Sep 17 00:00:00 2001 +From: Ard Biesheuvel <ard.biesheuvel@linaro.org> +Date: Sun, 2 Jun 2019 16:36:15 +0200 +Subject: [PATCH] acpi/arm64: ignore 5.1 FADTs that are reported as 5.0 + +Some Qualcomm Snapdragon based laptops built to run Microsoft Windows +are clearly ACPI 5.1 based, given that that is the first ACPI revision +that supports ARM, and introduced the FADT 'arm_boot_flags' field, +which has a non-zero field on those systems. + +So in these cases, infer from the ARM boot flags that the FADT must be +5.1 or later, and treat it as 5.1. + +Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> +--- + arch/arm64/kernel/acpi.c | 10 +++++++--- + 1 file changed, 7 insertions(+), 3 deletions(-) + +diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c +index 803f0494dd3e3..7722e85fb69c3 100644 +--- a/arch/arm64/kernel/acpi.c ++++ b/arch/arm64/kernel/acpi.c +@@ -155,10 +155,14 @@ static int __init acpi_fadt_sanity_check(void) + */ + if (table->revision < 5 || + (table->revision == 5 && fadt->minor_revision < 1)) { +- pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n", ++ pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 5.1+\n", + table->revision, fadt->minor_revision); +- ret = -EINVAL; +- goto out; ++ ++ if (!fadt->arm_boot_flags) { ++ ret = -EINVAL; ++ goto out; ++ } ++ pr_err("FADT has ARM boot flags set, assuming 5.1\n"); + } + + if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) { + |