Commits
Jon Hunter committed 8ebf15e9c86
i2c: tegra: Move suspend handling to NOIRQ phase
Commit acc8abcb2a9c ("i2c: tegra: Add suspend-resume support") added
suspend support for the Tegra I2C driver and following this change on
Tegra30 the following WARNING is seen on entering suspend ...
WARNING: CPU: 2 PID: 689 at /dvs/git/dirty/git-master_l4t-upstream/kernel/drivers/i2c/i2c-core.h:54 __i2c_transfer+0x35c/0x70c
i2c i2c-4: Transfer while suspended
Modules linked in: brcmfmac brcmutil
CPU: 2 PID: 689 Comm: rtcwake Not tainted 5.3.0-rc7-g089cf7f6ecb2 #1
Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
[<c0112264>] (unwind_backtrace) from [<c010ca94>] (show_stack+0x10/0x14)
[<c010ca94>] (show_stack) from [<c0a77024>] (dump_stack+0xb4/0xc8)
[<c0a77024>] (dump_stack) from [<c0124198>] (__warn+0xe0/0xf8)
[<c0124198>] (__warn) from [<c01241f8>] (warn_slowpath_fmt+0x48/0x6c)
[<c01241f8>] (warn_slowpath_fmt) from [<c06f6c40>] (__i2c_transfer+0x35c/0x70c)
[<c06f6c40>] (__i2c_transfer) from [<c06f7048>] (i2c_transfer+0x58/0xf4)
[<c06f7048>] (i2c_transfer) from [<c06f7130>] (i2c_transfer_buffer_flags+0x4c/0x70)
[<c06f7130>] (i2c_transfer_buffer_flags) from [<c05bee78>] (regmap_i2c_write+0x14/0x30)
[<c05bee78>] (regmap_i2c_write) from [<c05b9cac>] (_regmap_raw_write_impl+0x35c/0x868)
[<c05b9cac>] (_regmap_raw_write_impl) from [<c05b984c>] (_regmap_update_bits+0xe4/0xec)
[<c05b984c>] (_regmap_update_bits) from [<c05bad04>] (regmap_update_bits_base+0x50/0x74)
[<c05bad04>] (regmap_update_bits_base) from [<c04d453c>] (regulator_disable_regmap+0x44/0x54)
[<c04d453c>] (regulator_disable_regmap) from [<c04cf9d4>] (_regulator_do_disable+0xf8/0x268)
[<c04cf9d4>] (_regulator_do_disable) from [<c04d1694>] (_regulator_disable+0xf4/0x19c)
[<c04d1694>] (_regulator_disable) from [<c04d1770>] (regulator_disable+0x34/0x64)
[<c04d1770>] (regulator_disable) from [<c04d2310>] (regulator_bulk_disable+0x28/0xb4)
[<c04d2310>] (regulator_bulk_disable) from [<c0495cd4>] (tegra_pcie_power_off+0x64/0xa8)
[<c0495cd4>] (tegra_pcie_power_off) from [<c0495f74>] (tegra_pcie_pm_suspend+0x25c/0x3f4)
[<c0495f74>] (tegra_pcie_pm_suspend) from [<c05af48c>] (dpm_run_callback+0x38/0x1d4)
[<c05af48c>] (dpm_run_callback) from [<c05afe30>] (__device_suspend_noirq+0xc0/0x2b8)
[<c05afe30>] (__device_suspend_noirq) from [<c05b1c24>] (dpm_noirq_suspend_devices+0x100/0x37c)
[<c05b1c24>] (dpm_noirq_suspend_devices) from [<c05b1ebc>] (dpm_suspend_noirq+0x1c/0x48)
[<c05b1ebc>] (dpm_suspend_noirq) from [<c017d2c0>] (suspend_devices_and_enter+0x1d0/0xa00)
[<c017d2c0>] (suspend_devices_and_enter) from [<c017dd10>] (pm_suspend+0x220/0x74c)
[<c017dd10>] (pm_suspend) from [<c017c2c8>] (state_store+0x6c/0xc8)
[<c017c2c8>] (state_store) from [<c02ef398>] (kernfs_fop_write+0xe8/0x1c4)
[<c02ef398>] (kernfs_fop_write) from [<c0271e38>] (__vfs_write+0x2c/0x1c4)
[<c0271e38>] (__vfs_write) from [<c02748dc>] (vfs_write+0xa4/0x184)
[<c02748dc>] (vfs_write) from [<c0274b7c>] (ksys_write+0x9c/0xdc)
[<c0274b7c>] (ksys_write) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
Exception stack(0xe9f21fa8 to 0xe9f21ff0)
1fa0: 0000006c 004b2438 00000004 004b2438 00000004 00000000
1fc0: 0000006c 004b2438 004b1228 00000004 00000004 00000004 0049e78c 004b1228
1fe0: 00000004 be9809b8 b6f0bc0b b6e96206
The problem is that the Tegra PCIe driver indirectly uses I2C for
controlling some regulators and the I2C driver is now being suspended
before the PCIe driver causing the PCIe suspend to fail. The Tegra PCIe
driver is suspended during the NOIRQ phase and this cannot be changed
due to other dependencies. Therefore, we also need to move the suspend
handling for the Tegra I2C driver to the NOIRQ phase as well.
In order to move the I2C suspend handling to the NOIRQ phase we also
need to avoid calling pm_runtime_get/put() because per commit
1e2ef05bb8cf ("PM: Limit race conditions between runtime PM and system
sleep (v2)") these cannot be called early in resume. The function
tegra_i2c_init(), called during resume, calls pm_runtime_get/put() and
so move these calls outside of tegra_i2c_init(), so this function can
be used during the NOIRQ resume phase.
Fixes: acc8abcb2a9c ("i2c: tegra: Add suspend-resume support")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>