tree 98616ac3fbf2353f77081d2bf036e19c669c911e
parent b8cb40c5664df563442f2b97485f1eaaf0378a66
author Nicholas Troast <ntroast@codeaurora.org> 1499717668 -0700
committer Subbaraman Narayanamurthy <subbaram@codeaurora.org> 1503000828 -0700

power: qpnp-fg-gen3: make TTF monotonic by limiting slope

Currently if there is a spike in system load or a thermal event which
causes the battery current to change dramatically then the TTF can jump.

While a battery is charging the TTF should be monotonically decreasing.

Track the TTF starting with the first estimate and set hard bounds of -2
and -0.1 on the slope. The negative slope ensures the TTF is
monotonically decreasing and the hard bounds on the slope smooth out
significant changes in the TTF.

Change-Id: I68a934599ff25bc5a9eb67b372b28a723532a540
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>