clk_get_rate() takes a mutex, hence cannot be used while IRQ's been disabled. Replace it with a locked version.
[ 3.430853] [<c0850fcc>] (dump_stack) from [<c00411f8>] (__schedule_bug+0x50/0x64) [ 3.431079] [<c00411f8>] (__schedule_bug) from [<c08553a8>] (__schedule+0x5c8/0x688) [ 3.431453] [<c08553a8>] (__schedule) from [<c08558f4>] (schedule_preempt_disabled+0x24/0x34) [ 3.431835] [<c08558f4>] (schedule_preempt_disabled) from [<c0856f24>] (__mutex_lock_slowpath+0xbc/0x170) [ 3.432204] [<c0856f24>] (__mutex_lock_slowpath) from [<c0857024>] (mutex_lock+0x4c/0x50) [ 3.432427] [<c0857024>] (mutex_lock) from [<c0610368>] (clk_prepare_lock+0x88/0xfc) [ 3.432800] [<c0610368>] (clk_prepare_lock) from [<c0611034>] (clk_get_rate+0xc/0x60) [ 3.433177] [<c0611034>] (clk_get_rate) from [<c034f10c>] (tegra_pmc_enter_suspend_mode+0x188/0x20c) [ 3.433580] [<c034f10c>] (tegra_pmc_enter_suspend_mode) from [<c0020d48>] (tegra_idle_lp2_last+0xc/0x40) [ 3.433795] [<c0020d48>] (tegra_idle_lp2_last) from [<c0021e1c>] (tegra20_idle_lp2_coupled+0x118/0x1fc) [ 3.434171] [<c0021e1c>] (tegra20_idle_lp2_coupled) from [<c055ec24>] (cpuidle_enter_state+0x3c/0x160) [ 3.434551] [<c055ec24>] (cpuidle_enter_state) from [<c0560ce8>] (cpuidle_enter_state_coupled+0x3dc/0x3f4) [ 3.434959] [<c0560ce8>] (cpuidle_enter_state_coupled) from [<c0055f1c>] (cpu_startup_entry+0x240/0x288) [ 3.435340] [<c0055f1c>] (cpu_startup_entry) from [<c0b29c84>] (start_kernel+0x3b4/0x3c0) [ 3.435557] [<c0b29c84>] (start_kernel) from [<00008074>] (0x8074) Signed-off-by: Dmitry Osipenko <[email protected]> --- drivers/clk/tegra/clk-tegra-pmc.c | 9 +++++++++ drivers/soc/tegra/pmc.c | 2 +- include/linux/clk/tegra.h | 2 ++ 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/clk/tegra/clk-tegra-pmc.c b/drivers/clk/tegra/clk-tegra-pmc.c index 91377ab..1ccf414 100644 --- a/drivers/clk/tegra/clk-tegra-pmc.c +++ b/drivers/clk/tegra/clk-tegra-pmc.c @@ -78,6 +78,8 @@ static struct pmc_clk_init_data pmc_clks[] = { PMC_CLK(3, 22, 18), }; +static struct clk_hw *pclk_hw; + void __init tegra_pmc_clk_init(void __iomem *pmc_base, struct tegra_clk *tegra_clks) { @@ -112,6 +114,9 @@ void __init tegra_pmc_clk_init(void __iomem *pmc_base, clk_register_clkdev(clk, data->dev_name, data->gate_name); } + dt_clk = tegra_lookup_dt_id(tegra_clk_pclk, tegra_clks); + pclk_hw = __clk_get_hw(*dt_clk); + /* blink */ writel_relaxed(0, pmc_base + PMC_BLINK_TIMER); clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0, @@ -129,3 +134,7 @@ void __init tegra_pmc_clk_init(void __iomem *pmc_base, *dt_clk = clk; } +unsigned long tegra_pmc_get_pclk_rate(void) +{ + return clk_hw_get_rate(pclk_hw); +} diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c index 08966c2..6752714 100644 --- a/drivers/soc/tegra/pmc.c +++ b/drivers/soc/tegra/pmc.c @@ -638,7 +638,7 @@ void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode) break; case TEGRA_SUSPEND_LP2: - rate = clk_get_rate(pmc->clk); + rate = tegra_pmc_get_pclk_rate(); break; default: diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h index 57bf7aa..717d71d 100644 --- a/include/linux/clk/tegra.h +++ b/include/linux/clk/tegra.h @@ -121,4 +121,6 @@ static inline void tegra_cpu_clock_resume(void) } #endif +unsigned long tegra_pmc_get_pclk_rate(void); + #endif /* __LINUX_CLK_TEGRA_H_ */ -- 2.8.1
