linux-kernel - [PATCH V3] scsi: ufs: ufs-qcom: Change UFS devfreq timer to delayed

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Message-Id: <20230720093446.30697-1-quic_nitirawa@quicinc.com>
Date:   Thu, 20 Jul 2023 15:04:46 +0530
From:   Nitin Rawat <quic_nitirawa@...cinc.com>
To:     mani@...nel.org, quic_cang@...cinc.com, stanley.chu@...iatek.com,
        bvanassche@....org, quic_asutoshd@...cinc.com, avri.altman@....com,
        martin.petersen@...cle.com, beanhuo@...ron.com,
        konrad.dybcio@...aro.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        agross@...nel.org, andersson@...nel.org, jejb@...ux.ibm.com,
        linux-arm-msm@...r.kernel.org, quic_ziqichen@...cinc.com,
        Nitin Rawat <quic_nitirawa@...cinc.com>
Subject: [PATCH V3] scsi: ufs: ufs-qcom: Change UFS devfreq timer to delayed

Devfreq uses the default DEVFREQ_TIMER_DEFERRABLE mode which uses
the deferred timer for scheduling the devfreq load monitor function.
This causes the load monitoring to be done only with non-idle CPUs
and not making use of the idle CPUs.

Hence, use the DEVFREQ_TIMER_DELAYED mode which uses the delayed
timer thereby making use of idle CPUs as well for load monitoring.

Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
---

changes from v2:
- Modified commit message as per mani's suggestion
- removed threshold change

Changes from v1:
- Realigned the commit text

 drivers/ufs/host/ufs-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index df9161cb9825..07e5050dae77 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1619,6 +1619,7 @@ static void ufs_qcom_config_scaling_param(struct ufs_hba *hba,
 					struct devfreq_simple_ondemand_data *d)
 {
 	p->polling_ms = 60;
+	p->timer = DEVFREQ_TIMER_DELAYED;
 	d->upthreshold = 70;
 	d->downdifferential = 5;
 }
--
2.17.1