linux-kernel - [PATCH 2/4] clk: qcom: clk-krait: unlock spin after mux completion

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Message-Id: <20220429120108.9396-3-ansuelsmth@gmail.com>
Date:   Fri, 29 Apr 2022 14:01:06 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sricharan R <sricharan@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [PATCH 2/4] clk: qcom: clk-krait: unlock spin after mux completion

Unlock spinlock after the mux switch is completed to prevent any corner
case of mux request while the switch still needs to be done.

Fixes: 4d7dc77babfe ("clk: qcom: Add support for Krait clocks")
Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/clk/qcom/clk-krait.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-krait.c b/drivers/clk/qcom/clk-krait.c
index 59f1af415b58..90046428693c 100644
--- a/drivers/clk/qcom/clk-krait.c
+++ b/drivers/clk/qcom/clk-krait.c
@@ -32,11 +32,16 @@ static void __krait_mux_set_sel(struct krait_mux_clk *mux, int sel)
 		regval |= (sel & mux->mask) << (mux->shift + LPL_SHIFT);
 	}
 	krait_set_l2_indirect_reg(mux->offset, regval);
-	spin_unlock_irqrestore(&krait_clock_reg_lock, flags);
 
 	/* Wait for switch to complete. */
 	mb();
 	udelay(1);
+
+	/*
+	 * Unlock now to make sure the mux register is not
+	 * modified while switching to the new parent.
+	 */
+	spin_unlock_irqrestore(&krait_clock_reg_lock, flags);
 }
 
 static int krait_mux_set_parent(struct clk_hw *hw, u8 index)
-- 
2.34.1