smb-lib: Add support for thermal daemon throttling fcc

Add support to configure the reduced fcc as per thermal mitigation
levels.
At the max level disable charging and at the lowest level (zero)
remove all the mitigation. The intermediate levels would
end up configuring a reduced fcc.

Note that between the profile and Qnovo, the driver needs to
choose the maximum fcc. However, if thermal mitigation is active i.e.
it is at any level above zero, this needs to reduced to the fcc at
that thermal level. Use cascaded votables for this, where profile and
qnovo usecase vote for FCC_MAX and the result of FCC_MAX and thermal
levels vote for fcc.

Change-Id: I4f72857557222cbd719da7bd177511951ef7f1ff
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/power/qcom-charger/qpnp-qnovo.c b/drivers/power/qcom-charger/qpnp-qnovo.c
index d50188a5efbf..2418b112d670 100644
--- a/drivers/power/qcom-charger/qpnp-qnovo.c
+++ b/drivers/power/qcom-charger/qpnp-qnovo.c
@@ -153,7 +153,7 @@ struct qnovo {
 	struct work_struct	status_change_work;
 	int			fv_uV_request;
 	int			fcc_uA_request;
-	struct votable		*fcc_votable;
+	struct votable		*fcc_max_votable;
 	struct votable		*fv_votable;
 };
 
@@ -243,8 +243,9 @@ static int qnovo_disable_cb(struct votable *votable, void *data, int disable,
 				vote(chip->fv_votable, QNOVO_VOTER, false, 0);
 		}
 		if (chip->fcc_uA_request != -EINVAL) {
-			if (chip->fcc_votable)
-				vote(chip->fcc_votable, QNOVO_VOTER, false, 0);
+			if (chip->fcc_max_votable)
+				vote(chip->fcc_max_votable, QNOVO_VOTER,
+						false, 0);
 		}
 	}
 
@@ -265,10 +266,10 @@ static int qnovo_disable_cb(struct votable *votable, void *data, int disable,
 						true, chip->fv_uV_request);
 		}
 		if (chip->fcc_uA_request != -EINVAL) {
-			if (!chip->fcc_votable)
-				chip->fcc_votable = find_votable("FCC");
-			if (chip->fcc_votable)
-				vote(chip->fcc_votable, QNOVO_VOTER,
+			if (!chip->fcc_max_votable)
+				chip->fcc_max_votable = find_votable("FCC_MAX");
+			if (chip->fcc_max_votable)
+				vote(chip->fcc_max_votable, QNOVO_VOTER,
 						true, chip->fcc_uA_request);
 		}
 	}