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i2c: mpc: Fix timeout calculations

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At first glance the harmless cleanup of the driver does nothing bad.
However, as the operator precedence list states the '*' (multiplication)
and '/' division operators have order 5 with left-to-right associativity
the *= has order 17 and associativity right-to-left. It wouldn't be
a problem to replace

	foo = foo * HZ / 1000000;

with

	foo *= HZ / 1000000;

if HZ constant is in Hertz. The problem is that in the Linux kernel HZ is
defined in jiffy units, which is order of magnitude smaller than a million.
That's why operator precedence has a crucial role here. Fix the regression
by reverting pre-optimized calculations.

Fixes: be40a3ae71 ("i2c: mpc: Use of_property_read_u32 instead of of_get_property")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: <stable@vger.kernel.org> # v6.4+
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260618144934.3249950-1-andriy.shevchenko@linux.intel.com
This commit is contained in:
Andy Shevchenko 2026-06-18 16:49:34 +02:00 committed by Andi Shyti
parent 1dc18801be
commit 2e9a7f6832
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1 changed files with 1 additions and 1 deletions
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drivers/i2c/busses/i2c-mpc.c
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@ -844,7 +844,7 @@ static int fsl_i2c_probe(struct platform_device *op)
"fsl,timeout", &mpc_ops.timeout);
if (!result) {
mpc_ops.timeout *= HZ / 1000000;
mpc_ops.timeout = mpc_ops.timeout * HZ / 1000000;
if (mpc_ops.timeout < 5)
mpc_ops.timeout = 5;
} else {