This is a note to let you know that I've just added the patch titled
hwmon: (fam15h_power) Increase output resolution
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hwmon-fam15h_power-increase-output-resolution.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 941a956b0e387b21f385f486c34ef67576775cfc Mon Sep 17 00:00:00 2001
From: Andre Przywara <[email protected]>
Date: Fri, 23 Mar 2012 10:02:17 +0100
Subject: hwmon: (fam15h_power) Increase output resolution
From: Andre Przywara <[email protected]>
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 <[email protected]>
Signed-off-by: Andreas Herrmann <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
Signed-off-by: Tim Gardner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/hwmon/fam15h_power.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -61,14 +61,14 @@ static ssize_t show_power(struct device
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
* 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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/hwmon-fam15h_power-increase-output-resolution.patch
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