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Commit 286d5160 authored by Subbaraman Narayanamurthy's avatar Subbaraman Narayanamurthy
Browse files

power: qpnp-fg-gen3: Fine tune the monotonic SOC calculation 



Currently, all the values of raw monotonic SOC (0-255) gets
rounded off to 0-100. This can show up monotonic SOC hitting 0%
earlier when the SOC hadn't really hit zero yet. Improve the
SOC round off calculation so that 0 and 100 % can be shown when
it reaches the exact point.

Change-Id: I5bd9ebc8667a5beed9e1e97ff492aa1350f4d0f7
Signed-off-by: default avatarSubbaraman Narayanamurthy <subbaram@codeaurora.org>
parent ebac0555

drivers/power/supply/qcom/qpnp-fg-gen3.c

+13 −1
Original line number Diff line number Diff line
@@ -762,7 +762,19 @@ static int fg_get_msoc(struct fg_chip *chip, int *msoc) 
	if (rc < 0)

		return rc;



	*msoc = DIV_ROUND_CLOSEST(*msoc * FULL_CAPACITY, FULL_SOC_RAW);

	/*

	 * To have better endpoints for 0 and 100, it is good to tune the

	 * calculation discarding values 0 and 255 while rounding off. Rest

	 * of the values 1-254 will be scaled to 1-99. DIV_ROUND_UP will not

	 * be suitable here as it rounds up any value higher than 252 to 100.

	 */

	if (*msoc == FULL_SOC_RAW)

		*msoc = 100;

	else if (*msoc == 0)

		*msoc = 0;

	else

		*msoc = DIV_ROUND_CLOSEST((*msoc - 1) * (FULL_CAPACITY - 2),

				FULL_SOC_RAW - 2) + 1;

	return 0;

}