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Lareine Khawaly 2f29d780bd i2c: designware: use casting of u64 in clock multiplication to avoid overflow

[ Upstream commit c8c37bc514514999e62a17e95160ed9ebf75ca8d ]

In functions i2c_dw_scl_lcnt() and i2c_dw_scl_hcnt() may have overflow
by depending on the values of the given parameters including the ic_clk.
For example in our use case where ic_clk is larger than one million,
multiplication of ic_clk * 4700 will result in 32 bit overflow.

Add cast of u64 to the calculation to avoid multiplication overflow, and
use the corresponding define for divide.

Fixes: 2373f6b9744d ("i2c-designware: split of i2c-designware.c into core and bus specific parts")
Signed-off-by: Lareine Khawaly <lareine@amazon.com>
Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2023-02-01 08:27:26 +01:00

algos

i2c: algo: bit: use new macro to specifiy capabilities

2021-01-22 09:59:21 +01:00

busses

i2c: designware: use casting of u64 in clock multiplication to avoid overflow

2023-02-01 08:27:26 +01:00

muxes

i2c: mux: reg: check return value after calling platform_get_resource()

2022-12-31 13:14:31 +01:00

i2c-boardinfo.c

i2c: Remove support for dangling device properties