[PATCH v5 6/8] scsi: ufs: core: Check if scaling up is required when disable clkscale

[Ziqi Chen]

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.

Signed-off-by: Ziqi Chen <quic_ziqichen@xxxxxxxxxxx>
Co-developed-by: Can Guo <quic_cang@xxxxxxxxxxx>
Signed-off-by: Can Guo <quic_cang@xxxxxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Tested-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Reviewed-by: Bean Huo <beanhuo@xxxxxxxxxx>
Reviewed-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
---
 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 9908c0d6a1e1..727ca930c2ef 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -1770,6 +1770,10 @@ 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