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IPS driver: don't toggle CPU turbo on unsupported CPUs

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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>
This commit is contained in:
Jesse Barnes 2010-09-23 23:49:28 +02:00 committed by Matthew Garrett
parent a7abda8d72
commit 354aeeb1ca
1 changed files with 9 additions and 5 deletions
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14
drivers/platform/x86/intel_ips.c
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@ -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;