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author | Peng Fan <Peng.Fan@freescale.com> | 2015-05-06 14:39:46 +0800 |
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committer | Peng Fan <Peng.Fan@freescale.com> | 2015-05-06 14:39:46 +0800 |
commit | 87723f903454aaf17336e0fe9098ea7911c19f3c (patch) | |
tree | 568b6a99fe0adb7d4e3cebddb3ea701a5abc794a /board | |
parent | 120e8a6f2e32291c126063de588194db937f1da3 (diff) | |
download | u-boot-imx-87723f903454aaf17336e0fe9098ea7911c19f3c.zip u-boot-imx-87723f903454aaf17336e0fe9098ea7911c19f3c.tar.gz u-boot-imx-87723f903454aaf17336e0fe9098ea7911c19f3c.tar.bz2 |
MLK-10827 imx: mx6 update thermal driver according new equation
From IC guys:
"
After a thorough accuracy study of the Temp sense circuit,
we found that with our current equation, an average part can
read 7 degrees lower than a known forced temperature.
We also found out that the standard variance was around 2C;
which is the tightest distribution that we could create.
We need to change the temp sense equation to center the average
part around the target temperature.
Old Equation:
Temp = Troom,cal – slope*(Count measured – Count room fuse)
Where
Troom,cal = 25C and
Slope = 0.4297157 – (0.0015974 * Count room fuse)
New Equation:
Temp = Troom,cal – slope*(Count measured – Count room fuse) +offset
Where
Troom,cal = 25C and
Slope = 0.4445388 – (0.0016549 * Count room fuse)
Offset = 3.580661
"
According the new equation, update the thermal driver.
c1 and c2 changed to u64 type and update comments.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Diffstat (limited to 'board')
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