Messages in this thread Patch in this message |  | | From | Stefan Agner <> | | Subject | [PATCH 1/2] clk: imx: do not sleep if IRQ's are still disabled | | Date | Fri, 29 Jan 2016 14:49:23 -0800 |
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If a clock gets enabled early during boot time, it can lead to a PLL startup. The wait_lock function makes sure that the PLL is really stareted up before it gets used. However, the function sleeps which leads to scheduling and an error: bad: scheduling from the idle thread! ...
Use udelay in case IRQ's are still disabled.
Signed-off-by: Stefan Agner <stefan@agner.ch> --- drivers/clk/imx/clk-pllv3.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c index c05c43d..b5ff561 100644 --- a/drivers/clk/imx/clk-pllv3.c +++ b/drivers/clk/imx/clk-pllv3.c @@ -63,7 +63,10 @@ static int clk_pllv3_wait_lock(struct clk_pllv3 *pll) break; if (time_after(jiffies, timeout)) break; - usleep_range(50, 500); + if (unlikely(irqs_disabled())) + udelay(50); + else + usleep_range(50, 500); } while (1); return readl_relaxed(pll->base) & BM_PLL_LOCK ? 0 : -ETIMEDOUT; -- 2.7.0
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