drv: disable temperature compensation

We are not able to properly validate this code, we lack the proper testing environment: - instrumentation to heat/cool the cards; - measurnment algorithms; - stable signals for all channels. We could set it up, but we urgently need to release the v5 version, and this is a minor improvement. Therefore, this feature is disabled by default. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

drv: disable temperature compensation
We are not able to properly validate this code, we lack the proper testing environment: - instrumentation to heat/cool the cards; - measurnment algorithms; - stable signals for all channels. We could set it up, but we urgently need to release the v5 version, and this is a minor improvement. Therefore, this feature is disabled by default. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
d5b13c9a · Federico Vaga · 6ae2773a · d5b13c9a · d5b13c9a
Commit d5b13c9a authored Sep 11, 2020 by Federico Vaga
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Showing with 9 additions and 4 deletions

driver.rst doc/software/driver.rst +8 -3

fa-calibration.c kernel/fa-calibration.c +1 -1

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--- a/doc/software/driver.rst
+++ b/doc/software/driver.rst
@@ -82,9 +82,14 @@ enable_test_data=[0, 1]
     Trigger detection is unaffected by use of test data.

 fa_calib_period_s=NUMBER
-     The ADC has a periodic task that every 60 seconds adjusts the
-     calibration data based on the current temperature. You can use
-     this module parameter to pass your period in seconds.
+     The ADC periodically adjusts the calibration data based on the
+     current temperature. You can use this module parameter to pass
+     your period in seconds. By default the value is 0 (meaning
+     feature disabled).
+
+.. warning::
+   The periodical calibration is by default disabled because we were
+   not able to perform a complete validation. Use it at your own risk.

 .. _zio: https://www.ohwr.org/project/zio
 .. _fmc: https://www.ohwr.org/project/fmc-sw

--- a/kernel/fa-calibration.c
+++ b/kernel/fa-calibration.c
@@ -14,7 +14,7 @@
 #include <linux/jiffies.h>
 #include <fmc-adc-100m14b4cha.h>

-static int fa_calib_period_s = 60;
+static int fa_calib_period_s = 0;
 module_param_named(calib_s, fa_calib_period_s, int, 0444);

 /* This identity calibration is used as default */