diff options
| author | Sudeep Holla <Sudeep.Holla@arm.com> | 2016-08-25 12:23:39 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-30 10:12:46 +0200 |
| commit | 4b37b0ca71844614ada140b88dcee7fc2e8d1680 (patch) | |
| tree | 96954460da3888fc8bc07da198dd6e14d17a77ca | |
| parent | 9bdb254d4d7a829a36047780e308e287cea70abb (diff) | |
| download | linux-stable-4b37b0ca71844614ada140b88dcee7fc2e8d1680.tar.gz linux-stable-4b37b0ca71844614ada140b88dcee7fc2e8d1680.tar.bz2 linux-stable-4b37b0ca71844614ada140b88dcee7fc2e8d1680.zip | |
i2c: qup: skip qup_i2c_suspend if the device is already runtime suspended
commit 331dcf421c34d227784d07943eb01e4023a42b0a upstream.
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
...
This patch fixes the issue by executing qup_i2c_pm_suspend_runtime
conditionally in qup_i2c_suspend.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/i2c/busses/i2c-qup.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 041050edd809..57256bb42fcd 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -1610,7 +1610,8 @@ 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; } |