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ba172962 SL |
1 | From 859ec1ddd6a82520744e8c25c3b1611385a1a299 Mon Sep 17 00:00:00 2001 |
2 | From: Erwan Velu <erwanaliasr1@gmail.com> | |
3 | Date: Wed, 20 Feb 2019 11:10:17 +0100 | |
4 | Subject: cpufreq: acpi-cpufreq: Report if CPU doesn't support boost | |
5 | technologies | |
6 | ||
7 | [ Upstream commit 1222d527f314c86a3b59a522115d62facc5a7965 ] | |
8 | ||
9 | There is some rare cases where CPB (and possibly IDA) are missing on | |
10 | processors. | |
11 | ||
12 | This is the case fixed by commit f7f3dc00f612 ("x86/cpu/AMD: Fix | |
13 | erratum 1076 (CPB bit)") and following. | |
14 | ||
15 | In such context, the boost status isn't reported by | |
16 | /sys/devices/system/cpu/cpufreq/boost. | |
17 | ||
18 | This commit is about printing a message to report that the CPU | |
19 | doesn't expose the boost capabilities. | |
20 | ||
21 | This message could help debugging platforms hit by this phenomena. | |
22 | ||
23 | Signed-off-by: Erwan Velu <e.velu@criteo.com> | |
24 | [ rjw: Change the message text somewhat ] | |
25 | Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
26 | Signed-off-by: Sasha Levin <sashal@kernel.org> | |
27 | --- | |
28 | drivers/cpufreq/acpi-cpufreq.c | 4 +++- | |
29 | 1 file changed, 3 insertions(+), 1 deletion(-) | |
30 | ||
31 | diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c | |
32 | index b61f4ec43e06..aca30f45172e 100644 | |
33 | --- a/drivers/cpufreq/acpi-cpufreq.c | |
34 | +++ b/drivers/cpufreq/acpi-cpufreq.c | |
35 | @@ -911,8 +911,10 @@ static void __init acpi_cpufreq_boost_init(void) | |
36 | { | |
37 | int ret; | |
38 | ||
39 | - if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) | |
40 | + if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) { | |
41 | + pr_debug("Boost capabilities not present in the processor\n"); | |
42 | return; | |
43 | + } | |
44 | ||
45 | acpi_cpufreq_driver.set_boost = set_boost; | |
46 | acpi_cpufreq_driver.boost_enabled = boost_state(0); | |
47 | -- | |
48 | 2.19.1 | |
49 |