On 25-01-07, Matthias Fend wrote: > When calculating D-PHY registers, using data rates that are not multiples > of 16 can lead to precision loss in division operations. This can result in > register values that produce timing violations against the MIPI standard. > > An example: > cfg->hs_clk_rate = 294MHz > hf_clk = 18 > > If the desired value in cfg->init is 100us, which is the minimum allowed > value, then the LINEINITCNT register is calculated as 1799. But since the > actual clock is 18.375MHz instead of 18MHz, this setting results in a time > that is shorter than 100us and thus violates the standard. The correct > value for LINEINITCNT would be 1837. > > Improve the precision of calculations by using Hz instead of MHz as unit. > > Signed-off-by: Matthias Fend <matthias.fend@xxxxxxxxx> Reviewed-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
