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
