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From: Jayashree D <jayashree-d@hcl.com>
To: "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: Negative value returns for sensor in tiogapass
Thread-Topic: Negative value returns for sensor in tiogapass
Thread-Index: AdcMHNUlzX6I6Je8Q2WRGNkpWs0ATg==
Date: Fri, 26 Feb 2021 08:55:05 +0000
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Classification: Public
Hi Team,

Recently, I have tested sensors for tiogapass, in which one sensor returns =
negative value.
After analysing the code in the dbus-sensors repo, I found the following is=
sue.

dbus-sensors/IpmbSensor.cpp at master * openbmc/dbus-sensors (github.com)<h=
ttps://github.com/openbmc/dbus-sensors/blob/master/src/IpmbSensor.cpp#L267>

>From the above link, We need only below line in the code to process the HSC=
 sensors value for tiogapass.

int16_t value =3D ((data[4] << 8) | data[3]);

Since the below logic is added, the values get shifted and getting negative=
 values as output.

constexpr const size_t shift =3D 16 - 11; // 11bit into 16bit
value <<=3D shift;
value >>=3D shift;

Could you please suggest any idea to resolve this issue.

Regards,
Jayashree

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<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Classification: <b><s=
pan style=3D"color:green">Public</span></b><span style=3D"font-size:12.0pt"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal">Hi Team,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Recently, I have tested sensors for tiogapass, in wh=
ich one sensor returns negative value.<o:p></o:p></p>
<p class=3D"MsoNormal">After analysing the code in the dbus-sensors repo, I=
 found the following issue.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://github.com/openbmc/dbus-sensors/b=
lob/master/src/IpmbSensor.cpp#L267">dbus-sensors/IpmbSensor.cpp at master &=
middot; openbmc/dbus-sensors (github.com)</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">From the above link, We need only below line in the =
code to process the HSC sensors value for tiogapass.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">int16_t value =3D ((data[4] &lt;&lt; 8) | data[3]);<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Since the below logic is added, the values get shift=
ed and getting negative values as output.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">constexpr const size_t shift =3D 16 - 11; // 11bit i=
nto 16bit<o:p></o:p></p>
<p class=3D"MsoNormal">value &lt;&lt;=3D shift;<o:p></o:p></p>
<p class=3D"MsoNormal">value &gt;&gt;=3D shift;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Could you please suggest any idea to resolve this is=
sue.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Jayashree<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
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nded for the named recipient(s) only. E-mail transmission is not guaranteed=
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 lost, destroyed, arrive late or
 incomplete, or may contain viruses in transmission. The e mail and its con=
tents (with or without referred errors) shall therefore not attach any liab=
ility on the originator or HCL or its affiliates. Views or opinions, if any=
, presented in this email are solely
 those of the author and may not necessarily reflect the views or opinions =
of HCL or its affiliates. Any form of reproduction, dissemination, copying,=
 disclosure, modification, distribution and / or publication of this messag=
e without the prior written consent
 of authorized representative of HCL is strictly prohibited. If you have re=
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