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IPS driver: verify BIOS provided limits

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They're optional.  If not present or sane, we should use the CPU
defaults.

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 23:49:29 +02:00 committed by Matthew Garrett
parent 354aeeb1ca
commit eceab272fb
1 changed files with 23 additions and 0 deletions
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23
drivers/platform/x86/intel_ips.c
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@ -664,6 +664,27 @@ static bool mch_exceeded(struct ips_driver *ips)
return ret;
}
/**
* verify_limits - verify BIOS provided limits
* @ips: IPS structure
*
* BIOS can optionally provide non-default limits for power and temp. Check
* them here and use the defaults if the BIOS values are not provided or
* are otherwise unusable.
*/
static void verify_limits(struct ips_driver *ips)
{
if (ips->mcp_power_limit < ips->limits->mcp_power_limit ||
ips->mcp_power_limit > 35000)
ips->mcp_power_limit = ips->limits->mcp_power_limit;
if (ips->mcp_temp_limit < ips->limits->core_temp_limit ||
ips->mcp_temp_limit < ips->limits->mch_temp_limit ||
ips->mcp_temp_limit > 150)
ips->mcp_temp_limit = min(ips->limits->core_temp_limit,
ips->limits->mch_temp_limit);
}
/**
* update_turbo_limits - get various limits & settings from regs
* @ips: IPS driver struct
@ -688,6 +709,7 @@ static void update_turbo_limits(struct ips_driver *ips)
ips->mcp_temp_limit = thm_readw(THM_PTL);
ips->mcp_power_limit = thm_readw(THM_MPPC);
verify_limits(ips);
/* Ignore BIOS CPU vs GPU pref */
}
@ -1156,6 +1178,7 @@ static irqreturn_t ips_irq_handler(int irq, void *arg)
STS_PTL_SHIFT;
ips->mcp_power_limit = (tc1 & STS_PPL_MASK) >>
STS_PPL_SHIFT;
verify_limits(ips);
spin_unlock(&ips->turbo_status_lock);
thm_writeb(THM_SEC, SEC_ACK);