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authorJesse Barnes <jbarnes@virtuousgeek.org>2010-10-05 22:50:59 +0400
committerMatthew Garrett <mjg@redhat.com>2010-10-05 22:59:28 +0400
commit96f3823f537088c13735cfdfbf284436c802352a (patch)
treec9e205e864bc717676a5aa424f2cdb2a2e6f9c86 /drivers/platform
parent4fd07ac00d87b942cc8d8f30a27192fea2fc4ab2 (diff)
downloadlinux-96f3823f537088c13735cfdfbf284436c802352a.tar.xz
[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>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/intel_ips.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
index 50ab1c93e369..4b3ecdefd6e9 100644
--- a/drivers/platform/x86/intel_ips.c
+++ b/drivers/platform/x86/intel_ips.c
@@ -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");