From: Biju Das Date: Thu, 24 Oct 2024 13:42:11 +0000 (+0100) Subject: clk: renesas: rzg2l: Fix FOUTPOSTDIV clk X-Git-Tag: v6.13-rc1~110^2~2^5^2~3 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=dabf72b85f298970e86891b5218459c17b57b26a;p=thirdparty%2Flinux.git clk: renesas: rzg2l: Fix FOUTPOSTDIV clk While computing foutpostdiv_rate, the value of params->pl5_fracin is discarded, which results in the wrong refresh rate. Fix the formula for computing foutpostdiv_rate. Fixes: 1561380ee72f ("clk: renesas: rzg2l: Add FOUTPOSTDIV clk support") Signed-off-by: Hien Huynh Signed-off-by: Biju Das Reviewed-by: Geert Uytterhoeven Link: https://lore.kernel.org/20241024134236.315289-1-biju.das.jz@bp.renesas.com Signed-off-by: Geert Uytterhoeven --- diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index 85dad87f2318b..ddf722ca79eb0 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -548,7 +548,7 @@ static unsigned long rzg2l_cpg_get_foutpostdiv_rate(struct rzg2l_pll5_param *params, unsigned long rate) { - unsigned long foutpostdiv_rate; + unsigned long foutpostdiv_rate, foutvco_rate; params->pl5_intin = rate / MEGA; params->pl5_fracin = div_u64(((u64)rate % MEGA) << 24, MEGA); @@ -557,10 +557,11 @@ rzg2l_cpg_get_foutpostdiv_rate(struct rzg2l_pll5_param *params, params->pl5_postdiv2 = 1; params->pl5_spread = 0x16; - foutpostdiv_rate = - EXTAL_FREQ_IN_MEGA_HZ * MEGA / params->pl5_refdiv * - ((((params->pl5_intin << 24) + params->pl5_fracin)) >> 24) / - (params->pl5_postdiv1 * params->pl5_postdiv2); + foutvco_rate = div_u64(mul_u32_u32(EXTAL_FREQ_IN_MEGA_HZ * MEGA, + (params->pl5_intin << 24) + params->pl5_fracin), + params->pl5_refdiv) >> 24; + foutpostdiv_rate = DIV_ROUND_CLOSEST_ULL(foutvco_rate, + params->pl5_postdiv1 * params->pl5_postdiv2); return foutpostdiv_rate; }