Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19;
From:   Ansuel Smith <ansuelsmth@gmail.com>
To:     Bjorn Andersson <bjorn.andersson@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Sricharan R <sricharan@codeaurora.org>,
        linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Ansuel Smith <ansuelsmth@gmail.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Subject: [PATCH v2 2/3] clk: qcom: clk-krait: unlock spin after mux completion
Date:   Sat, 30 Apr 2022 07:44:57 +0200
Message-Id: <20220430054458.31321-3-ansuelsmth@gmail.com>
In-Reply-To: <20220430054458.31321-1-ansuelsmth@gmail.com>
References: <20220430054458.31321-1-ansuelsmth@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 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