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clk: renesas: rzg2l: Fix FOUTPOSTDIV clk

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[ 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 <hien.huynh.px@renesas.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20241024134236.315289-1-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Biju Das 2024-10-24 14:42:11 +01:00 committed by Greg Kroah-Hartman
parent 9bc7ccfbd3
commit 1b67ca853a
1 changed files with 6 additions and 5 deletions
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11
drivers/clk/renesas/rzg2l-cpg.c
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@ -289,7 +289,7 @@ static unsigned long
rzg2l_cpg_get_foutpostdiv_rate(struct rzg2l_pll5_param *params, rzg2l_cpg_get_foutpostdiv_rate(struct rzg2l_pll5_param *params,
unsigned long rate) unsigned long rate)
{ {
unsigned long foutpostdiv_rate; unsigned long foutpostdiv_rate, foutvco_rate;
params->pl5_intin = rate / MEGA; params->pl5_intin = rate / MEGA;
params->pl5_fracin = div_u64(((u64)rate % MEGA) << 24, MEGA); params->pl5_fracin = div_u64(((u64)rate % MEGA) << 24, MEGA);
@ -298,10 +298,11 @@ rzg2l_cpg_get_foutpostdiv_rate(struct rzg2l_pll5_param *params,
params->pl5_postdiv2 = 1; params->pl5_postdiv2 = 1;
params->pl5_spread = 0x16; params->pl5_spread = 0x16;
foutpostdiv_rate = foutvco_rate = div_u64(mul_u32_u32(EXTAL_FREQ_IN_MEGA_HZ * MEGA,
EXTAL_FREQ_IN_MEGA_HZ * MEGA / params->pl5_refdiv * (params->pl5_intin << 24) + params->pl5_fracin),
((((params->pl5_intin << 24) + params->pl5_fracin)) >> 24) / params->pl5_refdiv) >> 24;
(params->pl5_postdiv1 * params->pl5_postdiv2); foutpostdiv_rate = DIV_ROUND_CLOSEST_ULL(foutvco_rate,
params->pl5_postdiv1 * params->pl5_postdiv2);
return foutpostdiv_rate; return foutpostdiv_rate;
} }