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interconnect: qcom: Fix small BW votes being truncated to zero

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Small BW votes that translate to less than a single BCM unit are
currently truncated to zero. Ensure that non-zero BW requests always
result in at least a vote of 1 to BCM.

Change-Id: I144b22c11d19e29bebd19685b4d1a0e2b14a6abd
Signed-off-by: Mike Tipton <[email protected]>
This commit is contained in:
Mike Tipton 2020-04-30 19:56:33 -07:00
commit a07b8d59fd
1 changed files with 21 additions and 11 deletions
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32
drivers/interconnect/qcom/bcm-voter.c
View file

@ -55,34 +55,44 @@ static int cmp_vcd(void *priv, struct list_head *a, struct list_head *b)
return 1;
}
static u64 bcm_div(u64 num, u64 base)
{
/* Ensure that small votes aren't lost. */
if (num && num < base)
return 1;
return num / base;
}
static void bcm_aggregate(struct qcom_icc_bcm *bcm, bool init)
{
struct qcom_icc_node *node;
size_t i, bucket;
u64 agg_avg[QCOM_ICC_NUM_BUCKETS] = {0};
u64 agg_peak[QCOM_ICC_NUM_BUCKETS] = {0};
u64 temp;
u32 bcm_width, bcm_unit;
bcm_width = le16_to_cpu(bcm->aux_data.width);
bcm_unit = le32_to_cpu(bcm->aux_data.unit);
for (bucket = 0; bucket < QCOM_ICC_NUM_BUCKETS; bucket++) {
for (i = 0; i < bcm->num_nodes; i++) {
temp = bcm->nodes[i]->sum_avg[bucket] *
le16_to_cpu(bcm->aux_data.width);
do_div(temp, bcm->nodes[i]->buswidth *
bcm->nodes[i]->channels);
node = bcm->nodes[i];
temp = bcm_div(node->sum_avg[bucket] * bcm_width,
node->buswidth * node->channels);
agg_avg[bucket] = max(agg_avg[bucket], temp);
temp = bcm->nodes[i]->max_peak[bucket] *
le16_to_cpu(bcm->aux_data.width);
do_div(temp, bcm->nodes[i]->buswidth);
temp = bcm_div(node->max_peak[bucket] * bcm_width,
node->buswidth);
agg_peak[bucket] = max(agg_peak[bucket], temp);
}
temp = agg_avg[bucket] * bcm->vote_scale;
do_div(temp, le32_to_cpu(bcm->aux_data.unit));
bcm->vote_x[bucket] = temp;
bcm->vote_x[bucket] = bcm_div(temp, bcm_unit);
temp = agg_peak[bucket] * bcm->vote_scale;
do_div(temp, le32_to_cpu(bcm->aux_data.unit));
bcm->vote_y[bucket] = temp;
bcm->vote_y[bucket] = bcm_div(temp, bcm_unit);
}
if (bcm->keepalive) {