Patch "interconnect: qcom: bcm-voter: Improve enable_mask handling" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    interconnect: qcom: bcm-voter: Improve enable_mask handling

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     interconnect-qcom-bcm-voter-improve-enable_mask-hand.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4133d6a8ceb4577eb3e57ab30941a35b243fc91d
Author: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Date:   Sat Aug 12 01:16:15 2023 +0200

    interconnect: qcom: bcm-voter: Improve enable_mask handling
    
    [ Upstream commit a1f4170dec440f023601d57e49227b784074d218 ]
    
    We don't need all the complex arithmetic for BCMs utilizing enable_mask,
    as all we need to do is to determine whether there's any user (or
    keepalive) asking for it to be on.
    
    Separate the logic for such BCMs for a small speed boost.
    
    Suggested-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
    Reviewed-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
    Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230811-topic-icc_fix_1he-v2-1-0620af8ac133@xxxxxxxxxx
    Signed-off-by: Georgi Djakov <djakov@xxxxxxxxxx>
    Stable-dep-of: 1a70ca71547b ("interconnect: qcom: bcm-voter: Use enable_maks for keepalive voting")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/interconnect/qcom/bcm-voter.c b/drivers/interconnect/qcom/bcm-voter.c
index d5f2a6b5376bd..d857eb8838b95 100644
--- a/drivers/interconnect/qcom/bcm-voter.c
+++ b/drivers/interconnect/qcom/bcm-voter.c
@@ -58,6 +58,36 @@ static u64 bcm_div(u64 num, u32 base)
 	return num;
 }
 
+/* BCMs with enable_mask use one-hot-encoding for on/off signaling */
+static void bcm_aggregate_mask(struct qcom_icc_bcm *bcm)
+{
+	struct qcom_icc_node *node;
+	int bucket, i;
+
+	for (bucket = 0; bucket < QCOM_ICC_NUM_BUCKETS; bucket++) {
+		bcm->vote_x[bucket] = 0;
+		bcm->vote_y[bucket] = 0;
+
+		for (i = 0; i < bcm->num_nodes; i++) {
+			node = bcm->nodes[i];
+
+			/* If any vote in this bucket exists, keep the BCM enabled */
+			if (node->sum_avg[bucket] || node->max_peak[bucket]) {
+				bcm->vote_x[bucket] = 0;
+				bcm->vote_y[bucket] = bcm->enable_mask;
+				break;
+			}
+		}
+	}
+
+	if (bcm->keepalive) {
+		bcm->vote_x[QCOM_ICC_BUCKET_AMC] = 1;
+		bcm->vote_x[QCOM_ICC_BUCKET_WAKE] = 1;
+		bcm->vote_y[QCOM_ICC_BUCKET_AMC] = 1;
+		bcm->vote_y[QCOM_ICC_BUCKET_WAKE] = 1;
+	}
+}
+
 static void bcm_aggregate(struct qcom_icc_bcm *bcm)
 {
 	struct qcom_icc_node *node;
@@ -83,11 +113,6 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm)
 
 		temp = agg_peak[bucket] * bcm->vote_scale;
 		bcm->vote_y[bucket] = bcm_div(temp, bcm->aux_data.unit);
-
-		if (bcm->enable_mask && (bcm->vote_x[bucket] || bcm->vote_y[bucket])) {
-			bcm->vote_x[bucket] = 0;
-			bcm->vote_y[bucket] = bcm->enable_mask;
-		}
 	}
 
 	if (bcm->keepalive && bcm->vote_x[QCOM_ICC_BUCKET_AMC] == 0 &&
@@ -260,8 +285,12 @@ int qcom_icc_bcm_voter_commit(struct bcm_voter *voter)
 		return 0;
 
 	mutex_lock(&voter->lock);
-	list_for_each_entry(bcm, &voter->commit_list, list)
-		bcm_aggregate(bcm);
+	list_for_each_entry(bcm, &voter->commit_list, list) {
+		if (bcm->enable_mask)
+			bcm_aggregate_mask(bcm);
+		else
+			bcm_aggregate(bcm);
+	}
 
 	/*
 	 * Pre sort the BCMs based on VCD for ease of generating a command list



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