Below is the call trace of tegra210_init_pllu() function:
start_kernel()
-> time_init()
--> of_clk_init()
---> tegra210_clock_init()
----> tegra210_pll_init()
-----> tegra210_init_pllu()
Because the preemption is disabled in the start_kernel before calling
time_init, tegra210_init_pllu is actually in an atomic context while
it includes a readl_relaxed_poll_timeout that might sleep.
So this patch just changes this readl_relaxed_poll_timeout() to its
atomic version.
Signed-off-by: Nicolin Chen <nicoleotsuka@xxxxxxxxx>
Acked-By: Peter De Schrijver <pdeschrijver@xxxxxxxxxx>
---
Changelog
v2:
* Corrected a typo in the commit log
* Added Peter's Acked-by.
drivers/clk/tegra/clk-tegra210.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index 0b9789a..ea695c4 100644
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -2587,8 +2587,8 @@ static int tegra210_enable_pllu(void)
reg |= PLL_ENABLE;
writel(reg, clk_base + PLLU_BASE);
- readl_relaxed_poll_timeout(clk_base + PLLU_BASE, reg,
- reg & PLL_BASE_LOCK, 2, 1000);
+ readl_relaxed_poll_timeout_atomic(clk_base + PLLU_BASE, reg,
+ reg & PLL_BASE_LOCK, 2, 1000);
if (!(reg & PLL_BASE_LOCK)) {
pr_err("Timed out waiting for PLL_U to lock\n");
return -ETIMEDOUT;
--
2.1.4
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