UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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

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>
This commit is contained in:
Nicolin Chen 2017-09-15 12:10:13 -07:00 committed by Thierry Reding
parent 1752c9ee23
commit 22ef01a203
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/clk/tegra/clk-tegra210.c
View File

@ -2568,7 +2568,7 @@ static int tegra210_enable_pllu(void)
reg |= PLL_ENABLE;
writel(reg, clk_base + PLLU_BASE);
readl_relaxed_poll_timeout(clk_base + PLLU_BASE, reg,
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");