From 71a46d2ae0b22672f3a4c29c761b7942e96aa490 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Tue, 11 Mar 2025 08:51:19 +0900 Subject: [PATCH] clk: renesas: rzg2l: Fix FOUTPOSTDIV clk BugLink: https://bugs.launchpad.net/bugs/2101915 [ Upstream commit dabf72b85f298970e86891b5218459c17b57b26a ] 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 Signed-off-by: Sasha Levin Signed-off-by: Koichiro Den Signed-off-by: Stefan Bader --- drivers/clk/renesas/rzg2l-cpg.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index 3d2daa4ba2a4..41050f62db19 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -555,7 +555,7 @@ 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); @@ -564,10 +564,11 @@ 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; }