diff mbox series

[5.13,046/151] interconnect: qcom: icc-rpmh: Add BCMs to commit list in pre_aggregate

Message ID 20210816125445.588155407@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH Aug. 16, 2021, 1:01 p.m. UTC 
From: Mike Tipton <mdtipton@codeaurora.org>

[ Upstream commit f84f5b6f72e68bbaeb850b58ac167e4a3a47532a ]

We're only adding BCMs to the commit list in aggregate(), but there are
cases where pre_aggregate() is called without subsequently calling
aggregate(). In particular, in icc_sync_state() when a node with initial
BW has zero requests. Since BCMs aren't added to the commit list in
these cases, we don't actually send the zero BW request to HW. So the
resources remain on unnecessarily.

Add BCMs to the commit list in pre_aggregate() instead, which is always
called even when there are no requests.

Fixes: 976daac4a1c5 ("interconnect: qcom: Consolidate interconnect RPMh support")
Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>
Link: https://lore.kernel.org/r/20210721175432.2119-5-mdtipton@codeaurora.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/interconnect/qcom/icc-rpmh.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Comments

Georgi Djakov Aug. 16, 2021, 5:17 p.m. UTC | #1 
On 16.08.21 16:01, Greg Kroah-Hartman wrote:
> From: Mike Tipton <mdtipton@codeaurora.org>
> 
> [ Upstream commit f84f5b6f72e68bbaeb850b58ac167e4a3a47532a ]
> 
> We're only adding BCMs to the commit list in aggregate(), but there are
> cases where pre_aggregate() is called without subsequently calling
> aggregate(). In particular, in icc_sync_state() when a node with initial
> BW has zero requests. Since BCMs aren't added to the commit list in
> these cases, we don't actually send the zero BW request to HW. So the
> resources remain on unnecessarily.
> 
> Add BCMs to the commit list in pre_aggregate() instead, which is always
> called even when there are no requests.
> 
> Fixes: 976daac4a1c5 ("interconnect: qcom: Consolidate interconnect RPMh support")
> Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>
> Link: https://lore.kernel.org/r/20210721175432.2119-5-mdtipton@codeaurora.org
> Signed-off-by: Georgi Djakov <djakov@kernel.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>

Hello Greg and Sasha,

Please drop this patch from both 5.10 and 5.13 stable queues. It's
causing issues on some platforms and we are reverting in. Revert is
in linux-next already.

Thanks,
Georgi
diff mbox series

Patch

diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
index f6fae64861ce..27cc5f03611c 100644
--- a/drivers/interconnect/qcom/icc-rpmh.c
+++ b/drivers/interconnect/qcom/icc-rpmh.c
@@ -20,13 +20,18 @@  void qcom_icc_pre_aggregate(struct icc_node *node)
 {
 	size_t i;
 	struct qcom_icc_node *qn;
+	struct qcom_icc_provider *qp;
 
 	qn = node->data;
+	qp = to_qcom_provider(node->provider);
 
 	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
 		qn->sum_avg[i] = 0;
 		qn->max_peak[i] = 0;
 	}
+
+	for (i = 0; i < qn->num_bcms; i++)
+		qcom_icc_bcm_voter_add(qp->voter, qn->bcms[i]);
 }
 EXPORT_SYMBOL_GPL(qcom_icc_pre_aggregate);
 
@@ -44,10 +49,8 @@  int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 {
 	size_t i;
 	struct qcom_icc_node *qn;
-	struct qcom_icc_provider *qp;
 
 	qn = node->data;
-	qp = to_qcom_provider(node->provider);
 
 	if (!tag)
 		tag = QCOM_ICC_TAG_ALWAYS;
@@ -67,9 +70,6 @@  int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 	*agg_avg += avg_bw;
 	*agg_peak = max_t(u32, *agg_peak, peak_bw);
 
-	for (i = 0; i < qn->num_bcms; i++)
-		qcom_icc_bcm_voter_add(qp->voter, qn->bcms[i]);
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(qcom_icc_aggregate);