linux-kernel - [PATCH] scsi: ufs: core: Do clk scaling conditionally in reset and restore

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Message-ID: <20250613103140.1121621-1-anvithdosapati@google.com>
Date: Fri, 13 Jun 2025 10:31:40 +0000
From: Anvith Dosapati <anvithdosapati@...gle.com>
To: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>, 
	Bart Van Assche <bvanassche@....org>
Cc: Manivannan Sadhasivam <mani@...nel.org>, linux-scsi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, manugautam@...gle.com, vamshigajjela@...gle.com, 
	anvithdosapati <anvithdosapati@...gle.com>
Subject: [PATCH] scsi: ufs: core: Do clk scaling conditionally in reset and restore

From: anvithdosapati <anvithdosapati@...gle.com>

In ufshcd_host_reset_and_restore, scale up clocks only when clock
scaling is supported. Without this change cpu latency is voted for 0
(ufshcd_pm_qos_update) during resume unconditionally.

Signed-off-by: anvithdosapati <anvithdosapati@...gle.com>
---
 drivers/ufs/core/ufshcd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 4410e7d93b7d..fac381ea2b3a 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -7802,7 +7802,8 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
 	hba->silence_err_logs = false;
 
 	/* scale up clocks to max frequency before full reinitialization */
-	ufshcd_scale_clks(hba, ULONG_MAX, true);
+	if (ufshcd_is_clkscaling_supported(hba))
+		ufshcd_scale_clks(hba, ULONG_MAX, true);
 
 	err = ufshcd_hba_enable(hba);
 
-- 
2.50.0.rc1.591.g9c95f17f64-goog