[PATCH 5.18 0696/1095] clk: qcom: clk-krait: unlock spin after mux completion

Greg Kroah-Hartman
2022-08-15T21:54:46Z

From: Ansuel Smith <ansuelsmth@gmail.com>

[ Upstream commit df83d2c9e72910416f650ade1e07cc314ff02731 ]

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>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220430054458.31321-3-ansuelsmth@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.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)
--
2.35.1