linux-kernel - [PATCH 6/8] scsi: ufs: core: Check if scaling up is required when disable clkscale

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Message-Id: <20250116091150.1167739-7-quic_ziqichen@quicinc.com>
Date: Thu, 16 Jan 2025 17:11:47 +0800
From: Ziqi Chen <quic_ziqichen@...cinc.com>
To: quic_cang@...cinc.com, bvanassche@....org, mani@...nel.org,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, quic_ziqichen@...cinc.com,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com
Cc: linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Peter Wang <peter.wang@...iatek.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Maramaina Naresh <quic_mnaresh@...cinc.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 6/8] scsi: ufs: core: Check if scaling up is required when disable clkscale

When disabling clkscale via the clkscale_enable sysfs entry, UFS driver
shall perform scaling up once regardless. Check if scaling up is required
or not first to avoid repetitive work.

Co-developed-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
---
 drivers/ufs/core/ufshcd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 839bc23aeda0..721bf9d1a356 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -1772,6 +1772,10 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
 	freq = clki->max_freq;
 
 	ufshcd_suspend_clkscaling(hba);
+
+	if (!ufshcd_is_devfreq_scaling_required(hba, freq, true))
+		goto out_rel;
+
 	err = ufshcd_devfreq_scale(hba, freq, true);
 	if (err)
 		dev_err(hba->dev, "%s: failed to scale clocks up %d\n",
-- 
2.34.1