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This reverts commit 70121f7f3725 ("i2c: octeon: thunderx: Limit register access retries").
Using readq_poll_timeout instead of __raw_readq triggers the following
debug warning:
[ 78.871568] ipmi_ssif: Trying hotmod-specified SSIF interface at i2c address 0x12, adapter Cavium ThunderX i2c adapter at 0000:01:09.4, slave address 0x0
[ 78.886107] do not call blocking ops when !TASK_RUNNING; state=2 set at [<fffffc00080e0088>] prepare_to_wait_event+0x58/0x10c
[ 78.897436] ------------[ cut here ]------------
[ 78.902050] WARNING: CPU: 6 PID: 2235 at kernel/sched/core.c:7718 __might_sleep+0x80/0x88
[...]
[ 79.133553] [<fffffc00080c3aac>] __might_sleep+0x80/0x88
[ 79.138862] [<fffffc0000e30138>] octeon_i2c_test_iflg+0x4c/0xbc [i2c_thunderx]
[ 79.146077] [<fffffc0000e30958>] octeon_i2c_test_ready+0x18/0x70 [i2c_thunderx]
[ 79.153379] [<fffffc0000e30b04>] octeon_i2c_wait+0x154/0x1a4 [i2c_thunderx]
[ 79.160334] [<fffffc0000e310bc>] octeon_i2c_xfer+0xf4/0xf60 [i2c_thunderx]
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Acked-by: Steven J. Hill <steven.hill@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Do not infinitely retry register readq and writeq operations
in order to not lock up the CPU in case the TWSI gets stuck.
Return -ETIMEDOUT in case of a failed data read. For all other
cases just return so subsequent operations will fail.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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The register offsets are different between Octeon and ThunderX so move
them into the algorithm struct and get rid of the define.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Add SMBUS alert interrupt support. For now only device tree is
supported for specifying the alert. In case of ACPI an error
is returned.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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The ThunderX SOC uses the same i2c block as the Octeon SOC.
The main difference is that on ThunderX the device is a PCI device
so device probing is done via PCI, interrupts are MSI-X. The
clock rates can be set via device tree or ACPI.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Move common functionality into a separate file in preparation of the
re-use from the ThunderX i2c driver.
Functions are slightly re-ordered but no other changes are included.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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