linux-kernel - [PATCH] clk: rk3399: Allow to set rate of clk_i2s0

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Date: Sat, 17 Feb 2024 20:34:38 +0100
From: Ondřej Jirman <megi@....cz>
To: linux-kernel@...r.kernel.org
Cc: Ondrej Jirman <megi@....cz>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-clk@...r.kernel.org (open list:COMMON CLK FRAMEWORK),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Rockchip SoC support),
	linux-rockchip@...ts.infradead.org (open list:ARM/Rockchip SoC support)
Subject: [PATCH] clk: rk3399: Allow to set rate of clk_i2s0_frac's parent

From: Ondrej Jirman <megi@....cz>

Otherwise when when clk_i2s0 muxes to clk_i2s0_div which requires
setting high divider value on clk_i2s0_div, and then muxes back to
clk_i2s0_frac, clk_i2s0_frac would have no way to change the
clk_i2s0_div's divider ratio back to 1 so that it can satisfy the
condition for m/n > 20 for fractional division to work correctly.

Bug is reproducible by playing 44.1k audio, then 48k audio, and then
44.1k audio again. This results in clk_i2s0_div being set to 49 and
clk_i2s0_frac not being able to cope with such a low input clock rate
and audio playing extremely slowly.

The identical issue is on i2s1 and i2s2 clocks, too.

Signed-off-by: Ondrej Jirman <megi@....cz>
---
 drivers/clk/rockchip/clk-rk3399.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/rockchip/clk-rk3399.c b/drivers/clk/rockchip/clk-rk3399.c
index 5efac2ca3048..a17996acd065 100644
--- a/drivers/clk/rockchip/clk-rk3399.c
+++ b/drivers/clk/rockchip/clk-rk3399.c
@@ -597,7 +597,7 @@ static struct rockchip_clk_branch rk3399_clk_branches[] __initdata = {
 	COMPOSITE(0, "clk_i2s0_div", mux_pll_src_cpll_gpll_p, 0,
 			RK3399_CLKSEL_CON(28), 7, 1, MFLAGS, 0, 7, DFLAGS,
 			RK3399_CLKGATE_CON(8), 3, GFLAGS),
-	COMPOSITE_FRACMUX(0, "clk_i2s0_frac", "clk_i2s0_div", 0,
+	COMPOSITE_FRACMUX(0, "clk_i2s0_frac", "clk_i2s0_div", CLK_SET_RATE_PARENT,
 			RK3399_CLKSEL_CON(96), 0,
 			RK3399_CLKGATE_CON(8), 4, GFLAGS,
 			&rk3399_i2s0_fracmux),
@@ -607,7 +607,7 @@ static struct rockchip_clk_branch rk3399_clk_branches[] __initdata = {
 	COMPOSITE(0, "clk_i2s1_div", mux_pll_src_cpll_gpll_p, 0,
 			RK3399_CLKSEL_CON(29), 7, 1, MFLAGS, 0, 7, DFLAGS,
 			RK3399_CLKGATE_CON(8), 6, GFLAGS),
-	COMPOSITE_FRACMUX(0, "clk_i2s1_frac", "clk_i2s1_div", 0,
+	COMPOSITE_FRACMUX(0, "clk_i2s1_frac", "clk_i2s1_div", CLK_SET_RATE_PARENT,
 			RK3399_CLKSEL_CON(97), 0,
 			RK3399_CLKGATE_CON(8), 7, GFLAGS,
 			&rk3399_i2s1_fracmux),
@@ -617,7 +617,7 @@ static struct rockchip_clk_branch rk3399_clk_branches[] __initdata = {
 	COMPOSITE(0, "clk_i2s2_div", mux_pll_src_cpll_gpll_p, 0,
 			RK3399_CLKSEL_CON(30), 7, 1, MFLAGS, 0, 7, DFLAGS,
 			RK3399_CLKGATE_CON(8), 9, GFLAGS),
-	COMPOSITE_FRACMUX(0, "clk_i2s2_frac", "clk_i2s2_div", 0,
+	COMPOSITE_FRACMUX(0, "clk_i2s2_frac", "clk_i2s2_div", CLK_SET_RATE_PARENT,
 			RK3399_CLKSEL_CON(98), 0,
 			RK3399_CLKGATE_CON(8), 10, GFLAGS,
 			&rk3399_i2s2_fracmux),
-- 
2.43.0