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clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()

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[ Upstream commit 22ef01a203 ]

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@gmail.com>
Acked-By: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolin Chen
2017-09-15 12:10:13 -07:00
committed by Greg Kroah-Hartman
parent 85dcb3c850
commit a23c8c70b5
1 changed files with 2 additions and 2 deletions
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4
drivers/clk/tegra/clk-tegra210.c
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@@ -2566,8 +2566,8 @@ 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;