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[PATCH 2/2] IPS driver: disable CPU turbo 

The undocumented interface we're using for reading CPU power seems to be
overreporting power.  Until we figure out how to correct it, disable CPU
turbo and power reporting to be safe.  This will keep the CPU within default
limits and still allow us to increase GPU frequency as needed.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Jesse Barnes 2010-10-05 14:50:59 -04:00 committed by Matthew Garrett
parent 4fd07ac00d
commit 96f3823f53
1 changed files with 15 additions and 3 deletions
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18
drivers/platform/x86/intel_ips.c
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@ -715,8 +715,15 @@ static void update_turbo_limits(struct ips_driver *ips)
u32 hts = thm_readl(THM_HTS);
ips->cpu_turbo_enabled = !(hts & HTS_PCTD_DIS);
/*
* Disable turbo for now, until we can figure out why the power figures
* are wrong
*/
ips->cpu_turbo_enabled = false;
if (ips->gpu_busy)
ips->gpu_turbo_enabled = !(hts & HTS_GTD_DIS);
ips->core_power_limit = thm_readw(THM_MPCPC);
ips->mch_power_limit = thm_readw(THM_MMGPC);
ips->mcp_temp_limit = thm_readw(THM_PTL);
@ -895,7 +902,7 @@ static u32 get_cpu_power(struct ips_driver *ips, u32 *last, int period)
ret = (ret * 1000) / 65535;
*last = val;
return ret;
return 0;
}
static const u16 temp_decay_factor = 2;
@ -1186,6 +1193,11 @@ static irqreturn_t ips_irq_handler(int irq, void *arg)
STS_GPL_SHIFT;
/* ignore EC CPU vs GPU pref */
ips->cpu_turbo_enabled = !(sts & STS_PCTD_DIS);
/*
* Disable turbo for now, until we can figure
* out why the power figures are wrong
*/
ips->cpu_turbo_enabled = false;
if (ips->gpu_busy)
ips->gpu_turbo_enabled = !(sts & STS_GTD_DIS);
ips->mcp_temp_limit = (sts & STS_PTL_MASK) >>
@ -1573,8 +1585,8 @@ static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id)
/* Save turbo limits & ratios */
rdmsrl(TURBO_POWER_CURRENT_LIMIT, ips->orig_turbo_limit);
ips_enable_cpu_turbo(ips);
ips->cpu_turbo_enabled = true;
ips_disable_cpu_turbo(ips);
ips->cpu_turbo_enabled = false;
/* Create thermal adjust thread */
ips->adjust = kthread_create(ips_adjust, ips, "ips-adjust");