Commit a1f4170d authored by Konrad Dybcio's avatar Konrad Dybcio Committed by Georgi Djakov
Browse files

interconnect: qcom: bcm-voter: Improve enable_mask handling 



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: default avatarBjorn Andersson <quic_bjorande@quicinc.com>
Reviewed-by: default avatarBjorn Andersson <quic_bjorande@quicinc.com>
Signed-off-by: default avatarKonrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230811-topic-icc_fix_1he-v2-1-0620af8ac133@linaro.org


Signed-off-by: default avatarGeorgi Djakov <djakov@kernel.org>
parent 2ccdd1b1

drivers/interconnect/qcom/bcm-voter.c

+36 −7
Original line number Diff line number Diff line
@@ -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)

	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