diff options
| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-09-23 23:49:28 +0200 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2010-10-05 20:59:09 +0200 |
| commit | 354aeeb1ca8f82ea133ede21987034addc75057a (patch) | |
| tree | dd398a9bc263ecd2cfe10dfecaa18aec87abab4c /drivers | |
| parent | NULL pointer might be used in ips_monitor() (diff) | |
| download | linux-354aeeb1ca8f82ea133ede21987034addc75057a.tar.xz linux-354aeeb1ca8f82ea133ede21987034addc75057a.zip | |
IPS driver: don't toggle CPU turbo on unsupported CPUs
If the CPU doesn't support turbo, don't try to enable/disable it.
http://bugzilla.kernel.org/show_bug.cgi?id=18742
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/intel_ips.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c index bfa9c726054a..71d04ef47b8c 100644 --- a/drivers/platform/x86/intel_ips.c +++ b/drivers/platform/x86/intel_ips.c @@ -51,7 +51,6 @@ * TODO: * - handle CPU hotplug * - provide turbo enable/disable api - * - make sure we can write turbo enable/disable reg based on MISC_EN * * Related documents: * - CDI 403777, 403778 - Auburndale EDS vol 1 & 2 @@ -325,6 +324,7 @@ struct ips_driver { bool gpu_preferred; bool poll_turbo_status; bool second_cpu; + bool turbo_toggle_allowed; struct ips_mcp_limits *limits; /* Optional MCH interfaces for if i915 is in use */ @@ -461,7 +461,8 @@ static void ips_enable_cpu_turbo(struct ips_driver *ips) if (ips->__cpu_turbo_on) return; - on_each_cpu(do_enable_cpu_turbo, ips, 1); + if (ips->turbo_toggle_allowed) + on_each_cpu(do_enable_cpu_turbo, ips, 1); ips->__cpu_turbo_on = true; } @@ -498,7 +499,8 @@ static void ips_disable_cpu_turbo(struct ips_driver *ips) if (!ips->__cpu_turbo_on) return; - on_each_cpu(do_disable_cpu_turbo, ips, 1); + if (ips->turbo_toggle_allowed) + on_each_cpu(do_disable_cpu_turbo, ips, 1); ips->__cpu_turbo_on = false; } @@ -1332,8 +1334,10 @@ static struct ips_mcp_limits *ips_detect_cpu(struct ips_driver *ips) * turbo manually or we'll get an illegal MSR access, even though * turbo will still be available. */ - if (!(misc_en & IA32_MISC_TURBO_EN)) - ; /* add turbo MSR write allowed flag if necessary */ + if (misc_en & IA32_MISC_TURBO_EN) + ips->turbo_toggle_allowed = true; + else + ips->turbo_toggle_allowed = false; if (strstr(boot_cpu_data.x86_model_id, "CPU M")) limits = &ips_sv_limits; |