clk: renesas: rcar-gen3: Increase Z clock accuracy
Improve accuracy in the .determine_rate() callback for Z and Z2 clocks by using rounded divisions. This is similar to the calculation of rates and multipliers in the .recalc_rate() resp. set_rate() callbacks. Sample impact for a few requested clock rates: - R-Car H3: - Z 500 MHz: 468 MHz => 515 MHz - Z2 1000 MHz: 973 MHz => 1011 MHz - R-Car M3-W: - Z 500 MHz: 422 MHz => 516 MHz - Z2 800 MHz: 750 MHz => 788 MHz Signed-off-by:Geert Uytterhoeven <geert+renesas@glider.be> Acked-by:
Stephen Boyd <sboyd@kernel.org> Reviewed-by:
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Tested-by:
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/20210326120100.1577596-6-geert+renesas@glider.be
parent
67a1b9b6
Please register or sign in to comment