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| author | Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org> | 2011-08-27 15:21:12 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-08 21:43:06 +0200 |
| commit | 100aafc992039794d0facb0e7bbd02f8a11fd1d6 (patch) | |
| tree | 23b23fcea74891cf7bdcd028349596582738b529 /arch/arm/mach-mx5 | |
| parent | Linux 3.1-rc9 (diff) | |
| download | linux-100aafc992039794d0facb0e7bbd02f8a11fd1d6.tar.xz linux-100aafc992039794d0facb0e7bbd02f8a11fd1d6.zip | |
ARM: mx5: fix clock usage for suspend
While suspending, we're enabling a clock in ->suspend() but we're in atomic
context, leading to this :
[30803.667305] PM: late suspend of devices complete after 1.237 msecs
[30803.667449] BUG: sleeping function called from invalid context at kernel/mutex.c:271
[30803.667464] in_atomic(): 0, irqs_disabled(): 128, pid: 4941, name: pm-suspend
[30803.667474] INFO: lockdep is turned off.
[30803.667483] irq event stamp: 0
[30803.667489] hardirqs last enabled at (0): [< (null)>] (null)
[30803.667503] hardirqs last disabled at (0): [<c001e4a8>] copy_process.part.48+0x1e0/0xa7c
[30803.667543] softirqs last enabled at (0): [<c001e4a8>] copy_process.part.48+0x1e0/0xa7c
[30803.667562] softirqs last disabled at (0): [< (null)>] (null)
[30803.667574] Backtrace:
[30803.667611] [<c0010e00>] (dump_backtrace+0x0/0x110) from [<c0424c00>] (dump_stack+0x18/0x1c)
[30803.667624] r6:00000000 r5:00000000 r4:d9648000 r3:d9648000
[30803.667652] [<c0424be8>] (dump_stack+0x0/0x1c) from [<c0424eec>] (__might_sleep.part.101+0x90/0xa8)
[30803.667673] [<c0424e5c>] (__might_sleep.part.101+0x0/0xa8) from [<c001a5c4>] (__might_sleep+0x80/0x94)
[30803.667686] r4:c05d58c0
[30803.667705] [<c001a544>] (__might_sleep+0x0/0x94) from [<c043230c>] (mutex_lock_nested+0x2c/0x30c)
[30803.667735] [<c04322e0>] (mutex_lock_nested+0x0/0x30c) from [<c0017834>] (clk_enable+0x28/0x50)
[30803.667747] r8:c0438464 r7:00000003 r6:00000000 r5:00000000 r4:c05d2e98
[30803.667780] [<c001780c>] (clk_enable+0x0/0x50) from [<c0017260>] (mx5_suspend_enter+0x1c/0x98)
[30803.667792] r4:00000003 r3:c060dfe0
[30803.667821] [<c0017244>] (mx5_suspend_enter+0x0/0x98) from [<c0059b48>] (suspend_enter+0xec/0x15c)
[30803.667833] r4:00000003 r3:c0017244
[30803.667856] [<c0059a5c>] (suspend_enter+0x0/0x15c) from [<c0059c4c>] (suspend_devices_and_enter+0x94/0x130)
[30803.667868] r6:00000000 r5:00000003 r4:c0c0af00 r3:00002710
[30803.667897] [<c0059bb8>] (suspend_devices_and_enter+0x0/0x130) from [<c0059db0>] (enter_state+0xc8/0x130)
[30803.667909] r6:00000000 r5:00000003 r4:c05286e4
[30803.667934] [<c0059ce8>] (enter_state+0x0/0x130) from [<c00592d4>] (state_store+0xac/0xc0)
[30803.667945] r6:00000003 r5:00000003 r4:df39d000 r3:00000003
[30803.667978] [<c0059228>] (state_store+0x0/0xc0) from [<c01b0100>] (kobj_attr_store+0x1c/0x28)
[30803.668009] [<c01b00e4>] (kobj_attr_store+0x0/0x28) from [<c00e435c>] (sysfs_write_file+0x88/0xbc)
[30803.668032] [<c00e42d4>] (sysfs_write_file+0x0/0xbc) from [<c0091fa0>] (vfs_write+0xbc/0x138)
[30803.668051] [<c0091ee4>] (vfs_write+0x0/0x138) from [<c0092204>] (sys_write+0x44/0x70)
[30803.668062] r8:00000000 r7:00000004 r6:00000003 r5:002694d0 r4:d966acc0
[30803.668094] [<c00921c0>] (sys_write+0x0/0x70) from [<c000db00>] (ret_fast_syscall+0x0/0x3c)
[30803.668106] r9:d9648000 r8:c000dcc4 r6:00000001 r5:002694d0 r4:00000003
[30803.669927] PM: early resume of devices complete after 0.972 msecs
Just move the clk_enable/disable in ->prepare() and ->finish()
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-mx5')
| -rw-r--r-- | arch/arm/mach-mx5/pm-imx5.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/arm/mach-mx5/pm-imx5.c b/arch/arm/mach-mx5/pm-imx5.c index e4529af0da72..be19e9ce839a 100644 --- a/arch/arm/mach-mx5/pm-imx5.c +++ b/arch/arm/mach-mx5/pm-imx5.c @@ -19,9 +19,13 @@ static struct clk *gpc_dvfs_clk; +static int mx5_suspend_prepare(void) +{ + return clk_enable(gpc_dvfs_clk); +} + static int mx5_suspend_enter(suspend_state_t state) { - clk_enable(gpc_dvfs_clk); switch (state) { case PM_SUSPEND_MEM: mx5_cpu_lp_set(STOP_POWER_OFF); @@ -42,11 +46,14 @@ static int mx5_suspend_enter(suspend_state_t state) __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR); } cpu_do_idle(); - clk_disable(gpc_dvfs_clk); - return 0; } +static void mx5_suspend_finish(void) +{ + clk_disable(gpc_dvfs_clk); +} + static int mx5_pm_valid(suspend_state_t state) { return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX); @@ -54,7 +61,9 @@ static int mx5_pm_valid(suspend_state_t state) static const struct platform_suspend_ops mx5_suspend_ops = { .valid = mx5_pm_valid, + .prepare = mx5_suspend_prepare, .enter = mx5_suspend_enter, + .finish = mx5_suspend_finish, }; static int __init mx5_pm_init(void) |