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Commit 82985a4a authored by Ashay Jaiswal's avatar Ashay Jaiswal
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power: vm-bms: use die-temp compensation for VADC readings 



VM-BMS uses VADC to read the battery voltage.
Incorporate die-temp compensation into VADC reading
for better accuracy in SOC calculation.

Change-Id: I91e3ca936da162964c8ebafa09c4a85128ccd2ce
Signed-off-by: default avatarAshay Jaiswal <ashayj@codeaurora.org>
parent 204ea500

drivers/power/qpnp-vm-bms.c

+11 −5
Original line number Diff line number Diff line
@@ -816,7 +816,8 @@ static int calib_vadc(struct qpnp_bms_chip *chip) 
static int convert_vbatt_raw_to_uv(struct qpnp_bms_chip *chip,

				u16 reading, bool is_pon_ocv)

{

	int64_t uv;

	int64_t uv, vbatt;

	int rc;



	uv = vadc_reading_to_uv(reading, true);

	pr_debug("%u raw converted into %lld uv\n", reading, uv);
@@ -824,10 +825,15 @@ static int convert_vbatt_raw_to_uv(struct qpnp_bms_chip *chip, 
	uv = adjust_vbatt_reading(chip, uv);

	pr_debug("adjusted into %lld uv\n", uv);



	/*

	 * TODO: add die-temp compensation once the ADC temp.

	 * coeffs are available

	 */

	vbatt = uv;

	rc = qpnp_vbat_sns_comp_result(chip->vadc_dev, &uv, is_pon_ocv);

	if (rc) {

		pr_debug("Vbatt compensation failed rc = %d\n", rc);

		uv = vbatt;

	} else {

		pr_debug("temp-compensated %lld into %lld uv\n", vbatt, uv);

	}



	return uv;

}