From: Mike Tipton <mdtipton@codeaurora.org>
To: georgi.djakov@linaro.org
Cc: bjorn.andersson@linaro.org, agross@kernel.org,
linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Mike Tipton <mdtipton@codeaurora.org>
Subject: [PATCH v4 1/6] interconnect: qcom: Fix small BW votes being truncated to zero
Date: Thu, 3 Sep 2020 12:21:44 -0700 [thread overview]
Message-ID: <20200903192149.30385-2-mdtipton@codeaurora.org> (raw)
In-Reply-To: <20200903192149.30385-1-mdtipton@codeaurora.org>
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@codeaurora.org>
---
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 a3d2ef1d9903..609db9c95fd7 100644
--- a/drivers/interconnect/qcom/bcm-voter.c
+++ b/drivers/interconnect/qcom/bcm-voter.c
@@ -52,8 +52,20 @@ static int cmp_vcd(void *priv, struct list_head *a, struct list_head *b)
return 1;
}
+static u64 bcm_div(u64 num, u32 base)
+{
+ /* Ensure that small votes aren't lost. */
+ if (num && num < base)
+ return 1;
+
+ do_div(num, base);
+
+ 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};
@@ -61,22 +73,21 @@ 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] * 1000ULL;
- 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] * 1000ULL;
- 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 Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-09-03 19:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 19:21 [PATCH v4 0/6] interconnect: qcom: Misc bcm-voter changes and fixes Mike Tipton
2020-09-03 19:21 ` Mike Tipton [this message]
2020-09-03 19:21 ` [PATCH v4 2/6] dt-bindings: interconnect: Add generic qcom bindings Mike Tipton
2020-09-03 19:21 ` [PATCH v4 3/6] dt-bindings: interconnect: Add property to set BCM TCS wait behavior Mike Tipton
2020-09-03 19:21 ` [PATCH v4 4/6] interconnect: qcom: Support bcm-voter-specific " Mike Tipton
2020-09-03 19:21 ` [PATCH v4 5/6] interconnect: qcom: Only wait for completion in AMC/WAKE by default Mike Tipton
2020-09-03 19:21 ` [PATCH v4 6/6] interconnect: qcom: Add support for per-BCM scaling factors Mike Tipton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200903192149.30385-2-mdtipton@codeaurora.org \
--to=mdtipton@codeaurora.org \
--cc=agross@kernel.org \
--cc=bjorn.andersson@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=georgi.djakov@linaro.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).