If the i2c device is already runtime suspended, if qup_i2c_suspend is
executed during suspend-to-idle or suspend-to-ram it will result in the
following splat:
WARNING: CPU: 3 PID: 1593 at drivers/clk/clk.c:476 clk_core_unprepare+0x80/0x90
Modules linked in:
CPU: 3 PID: 1593 Comm: bash Tainted: G W 4.8.0-rc3 #14
Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
PC is at clk_core_unprepare+0x80/0x90
LR is at clk_unprepare+0x28/0x40
pc : [<ffff0000086eecf0>] lr : [<ffff0000086f0c58>] pstate: 60000145
Call trace:
clk_core_unprepare+0x80/0x90
qup_i2c_disable_clocks+0x2c/0x68
qup_i2c_suspend+0x10/0x20
platform_pm_suspend+0x24/0x68
dpm_run_callback.isra.7+0x1c/0x70
__device_suspend+0xf4/0x298
dpm_suspend+0x10c/0x228
dpm_suspend_start+0x68/0x78
suspend_devices_and_enter+0xb8/0x460
pm_suspend+0x1ec/0x240
state_store+0x84/0xf8
kobj_attr_store+0x14/0x28
sysfs_kf_write+0x48/0x58
kernfs_fop_write+0x15c/0x1f8
__vfs_write+0x1c/0x100
vfs_write+0x9c/0x1b8
SyS_write+0x44/0xa0
el0_svc_naked+0x24/0x28
This patch fixes the issue by executing qup_i2c_pm_suspend_runtime
conditionally in qup_i2c_suspend.
Cc: Andy Gross <andy.gross@xxxxxxxxxx>
Cc: David Brown <david.brown@xxxxxxxxxx>
Cc: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
---
drivers/i2c/busses/i2c-qup.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 501bd15cb78e..a8497cfdae6f 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -1599,7 +1599,8 @@ static int qup_i2c_pm_resume_runtime(struct device *device)
#ifdef CONFIG_PM_SLEEP
static int qup_i2c_suspend(struct device *device)
{
- qup_i2c_pm_suspend_runtime(device);
+ if (!pm_runtime_suspended(device))
+ return qup_i2c_pm_suspend_runtime(device);
return 0;
}
--
2.7.4
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