On 7/2/2020 4:11 AM, Georgi Djakov wrote:
Hi Mike,
On 6/23/20 07:08, Mike Tipton wrote:
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.
Fixes: 976daac4a1c5 ("interconnect: qcom: Consolidate interconnect RPMh support")
Signed-off-by: Mike Tipton <mdtipton@xxxxxxxxxxxxxx>
---
drivers/interconnect/qcom/bcm-voter.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/interconnect/qcom/bcm-voter.c b/drivers/interconnect/qcom/bcm-voter.c
index a68c858ca6b7..9e2612fe7fad 100644
--- a/drivers/interconnect/qcom/bcm-voter.c
+++ b/drivers/interconnect/qcom/bcm-voter.c
@@ -54,8 +54,20 @@ 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;
+
+ do_div(num, base);
do_div() does a 64-by-32 division, which will truncate these to 32-bit.
I can change base to a u32. It doesn't need anything more than that.
+
+ return num;
+}
+
static void bcm_aggregate(struct qcom_icc_bcm *bcm)
{
+ 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};
@@ -63,22 +75,21 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm)
for (bucket = 0; bucket < QCOM_ICC_NUM_BUCKETS; bucket++) {
for (i = 0; i < bcm->num_nodes; i++) {
- temp = bcm->nodes[i]->sum_avg[bucket] * 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->aux_data.width,
+ node->buswidth * node->channels);
agg_avg[bucket] = max(agg_avg[bucket], temp);
- temp = bcm->nodes[i]->max_peak[bucket] * bcm->aux_data.width;
- do_div(temp, bcm->nodes[i]->buswidth);
+ temp = bcm_div(node->max_peak[bucket] * bcm->aux_data.width,
+ node->buswidth);
agg_peak[bucket] = max(agg_peak[bucket], temp);
}
temp = agg_avg[bucket] * bcm->vote_scale;
- do_div(temp, bcm->aux_data.unit);
- bcm->vote_x[bucket] = temp;
+ bcm->vote_x[bucket] = bcm_div(temp, bcm->aux_data.unit);
temp = agg_peak[bucket] * bcm->vote_scale;
- do_div(temp, bcm->aux_data.unit);
- bcm->vote_y[bucket] = temp;
+ bcm->vote_y[bucket] = bcm_div(temp, bcm->aux_data.unit);
}
if (bcm->keepalive && bcm->vote_x[QCOM_ICC_BUCKET_AMC] == 0 &&
The rest looks good.
Thanks,
Georgi
