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authorAndre Przywara <andre.przywara@amd.com>2012-03-23 10:02:17 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-06-17 11:23:11 -0700
commit18f63bf60d507b4588f33ecfd8657f5d5e2a7b45 (patch)
treeb7dae3898ad23958ff143652610c8d76d960b2b7 /drivers/hwmon
parent4286e566ff410a64f5a329fb42f2d44193c52945 (diff)
hwmon: (fam15h_power) Increase output resolution
commit 941a956b0e387b21f385f486c34ef67576775cfc upstream. On high CPU load the accumulating values in the running_avg_cap register are very low (below 10), so averaging them too early leads to unnecessary poor output resolution. Since we pretend to output micro-Watt we better keep all the bits we have as long as possible. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Tim Gardner <tim.gardner@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/fam15h_power.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
index 9a4c3abc9d92..e8e18cab1fb8 100644
--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -61,14 +61,14 @@ static ssize_t show_power(struct device *dev,
REG_TDP_RUNNING_AVERAGE, &val);
running_avg_capture = (val >> 4) & 0x3fffff;
running_avg_capture = sign_extend32(running_avg_capture, 21);
- running_avg_range = val & 0xf;
+ running_avg_range = (val & 0xf) + 1;
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
REG_TDP_LIMIT3, &val);
tdp_limit = val >> 16;
- curr_pwr_watts = tdp_limit + data->base_tdp -
- (s32)(running_avg_capture >> (running_avg_range + 1));
+ curr_pwr_watts = (tdp_limit + data->base_tdp) << running_avg_range;
+ curr_pwr_watts -= running_avg_capture;
curr_pwr_watts *= data->tdp_to_watts;
/*
@@ -78,7 +78,7 @@ static ssize_t show_power(struct device *dev,
* scaling factor 1/(2^16). For conversion we use
* (10^6)/(2^16) = 15625/(2^10)
*/
- curr_pwr_watts = (curr_pwr_watts * 15625) >> 10;
+ curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
}
static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);