From: Guillermo Rodríguez Date: Thu, 11 Jun 2026 10:48:56 +0000 (+0200) Subject: i2c: stm32f7: truncate clock period instead of rounding it X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=111bb7f9f4a90b32e495d70a607c67b137f3074a;p=thirdparty%2Flinux.git i2c: stm32f7: truncate clock period instead of rounding it stm32f7_i2c_compute_timing() derives the I2C clock source period (i2cclk) with DIV_ROUND_CLOSEST, which may round it up. When the period is overestimated, all timings computed from it (SCLDEL, SDADEL, SCLL, SCLH) come out shorter on the wire than calculated, and the resulting bus rate can exceed the requested speed, violating the I2C specification minimums for tLOW and tHIGH. For example, with a 104.45 MHz clock source (e.g. PCLK1, the reset-default I2C clock source on STM32MP1), i2cclk is rounded from 9.574 ns up to 10 ns. Requesting a 400 kHz fast mode bus with 72/27 ns rise/fall times and no analog/digital filters then produces an actual bus rate of 415.6 kHz with tLOW = 1254 ns, violating both the 400 kHz maximum rate and the 1300 ns tLOW minimum of the specification. Truncate the period instead, so that it can only be underestimated. The error then falls on the safe side: the programmed timings come out slightly longer than computed and the bus runs marginally below the target rate (375.3 kHz in the example above) while meeting the specification. i2cbus is left rounded-to-closest: it is only used as the target of the clk_error comparison and is never multiplied into the programmed timings, so nearest rounding remains accurate there. Fixes: aeb068c57214 ("i2c: i2c-stm32f7: add driver") Signed-off-by: Guillermo Rodríguez Cc: # v4.14+ Acked-by: Alain Volmat Reviewed-by: Pierre-Yves MORDRET Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/20260611104857.242153-1-guille.rodriguez@gmail.com --- diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c index 16c6e61c7e119..d6d993b436cb7 100644 --- a/drivers/i2c/busses/i2c-stm32f7.c +++ b/drivers/i2c/busses/i2c-stm32f7.c @@ -464,8 +464,13 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev, { struct stm32f7_i2c_spec *specs; u32 p_prev = STM32F7_PRESC_MAX; - u32 i2cclk = DIV_ROUND_CLOSEST(NSEC_PER_SEC, - setup->clock_src); + /* + * Truncate instead of rounding to closest: if the clock period is + * overestimated, the computed SCL timings will come out shorter on + * the wire, which can push the bus above the target rate and below + * the spec's tLOW/tHIGH minimums. + */ + u32 i2cclk = NSEC_PER_SEC / setup->clock_src; u32 i2cbus = DIV_ROUND_CLOSEST(NSEC_PER_SEC, setup->speed_freq); u32 clk_error_prev = i2cbus;