[PATCH v3 6/8] scsi: ufs: core: Check if scaling up is required when disable clkscale

Ziqi Chen
2025-02-03T08:13:07Z

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@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Ziqi Chen <quic_ziqichen@quicinc.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 ebab897080a6..bd93119a177d 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -1777,6 +1777,10 @@ 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