diff options
Diffstat (limited to 'qcom-QDF2432-tmp-errata.patch')
| -rw-r--r-- | qcom-QDF2432-tmp-errata.patch | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/qcom-QDF2432-tmp-errata.patch b/qcom-QDF2432-tmp-errata.patch deleted file mode 100644 index f7ace4787..000000000 --- a/qcom-QDF2432-tmp-errata.patch +++ /dev/null @@ -1,59 +0,0 @@ -From edc7986d4d405daebaf2f66269b353da579fce5f Mon Sep 17 00:00:00 2001 -From: Christopher Covington <cov@codeaurora.org> -Date: Tue, 31 May 2016 16:19:02 -0400 -Subject: arm64: Workaround for QDF2432 ID_AA64 SR accesses - -The ARMv8.0 architecture reserves several system register encodings for -future use. These encodings should behave as read-only and always return -zero on a read. As described in Errata 94, the CPU cores in the QDF2432 -errantly cause an instruction abort if an AArch64 MRS instruction attempts -to read any of the following system register encodings: - - Op0, Op1, CRn, CRm, Op2 - 3, 0, C0, [C4-C7], [2-3, 6-7] - 3, 0, C0, C3, [3-7] - 3, 0, C0, [C4,C6,C7], [4-5] - 3, 0, C0, C2, [6-7] - -Naively projecting ARMv8.0 names, this space includes: - - ID_AA64PFR[2-7]_EL1 - ID_AA64DFR[2-3]_EL1 - ID_AA64AFR[2-3]_EL1 - ID_AA64ISAR[2-7]_EL1 - ID_AA64MMFR[2-7]_EL1 - -As of v4.8-rc2, Linux only attempts to query one register in this space, -ID_AA64MMFR2_EL1. As simple workaround, skip that access when the affected -MIDR is detected. - -Signed-off-by: Christopher Covington <cov@codeaurora.org> ---- - arch/arm64/kernel/cpuinfo.c | 4 +++- - 1 file changed, 3 insertions(+), 1 deletion(-) - -diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c -index ed1b84f..790de6b 100644 ---- a/arch/arm64/kernel/cpuinfo.c -+++ b/arch/arm64/kernel/cpuinfo.c -@@ -325,6 +325,8 @@ static void cpuinfo_detect_icache_policy(struct cpuinfo_arm64 *info) - - static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) - { -+ bool qdf2432_cpu = read_cpuid_id() == 0x510f2811; -+ - info->reg_cntfrq = arch_timer_get_cntfrq(); - info->reg_ctr = read_cpuid_cachetype(); - info->reg_dczid = read_cpuid(DCZID_EL0); -@@ -337,7 +339,7 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) - info->reg_id_aa64isar1 = read_cpuid(ID_AA64ISAR1_EL1); - info->reg_id_aa64mmfr0 = read_cpuid(ID_AA64MMFR0_EL1); - info->reg_id_aa64mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); -- info->reg_id_aa64mmfr2 = read_cpuid(ID_AA64MMFR2_EL1); -+ info->reg_id_aa64mmfr2 = qdf2432_cpu ? 0 : read_cpuid(ID_AA64MMFR2_EL1); - info->reg_id_aa64pfr0 = read_cpuid(ID_AA64PFR0_EL1); - info->reg_id_aa64pfr1 = read_cpuid(ID_AA64PFR1_EL1); - --- -cgit v0.12 - |