linux-kernel - [PATCH] clk: imx: imx6sx: spdif clock rate is too high for asrc

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Message-Id: <20230331072058.2483975-1-peng.fan@oss.nxp.com>
Date:   Fri, 31 Mar 2023 15:20:58 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     abelvesa@...nel.org, abel.vesa@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com
Cc:     linux-imx@....com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Shengjiu Wang <shengjiu.wang@....com>,
        Peng Fan <peng.fan@....com>
Subject: [PATCH] clk: imx: imx6sx: spdif clock rate is too high for asrc

From: Shengjiu Wang <shengjiu.wang@....com>

spdif clock is one of the asrc clock source, which is used
for ideal ratio mode. when set to 98.304MHz, it cause the
divider of asrc input clock and output clock exceed the
maximum value, and asrc driver saturate the value to maximum
value, which will cause the ASRC's performance very bad.
So we need to set spdif clock to a proper rate. which make asrc
divider not exceed maximum value, at least one of divider not
exceed maximum value.
The target is spdif clock rate / output(or input) sample rate
less than 1024(which is maximum divider).

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/clk/imx/clk-imx6sx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx6sx.c b/drivers/clk/imx/clk-imx6sx.c
index 7cf86707bc39..3face052527d 100644
--- a/drivers/clk/imx/clk-imx6sx.c
+++ b/drivers/clk/imx/clk-imx6sx.c
@@ -520,7 +520,7 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
 	clk_set_rate(hws[IMX6SX_CLK_PLL4_AUDIO_DIV]->clk, 393216000);
 
 	clk_set_parent(hws[IMX6SX_CLK_SPDIF_SEL]->clk, hws[IMX6SX_CLK_PLL4_AUDIO_DIV]->clk);
-	clk_set_rate(hws[IMX6SX_CLK_SPDIF_PODF]->clk, 98304000);
+	clk_set_rate(hws[IMX6SX_CLK_SPDIF_PODF]->clk, 24576000);
 
 	clk_set_parent(hws[IMX6SX_CLK_AUDIO_SEL]->clk, hws[IMX6SX_CLK_PLL3_USB_OTG]->clk);
 	clk_set_rate(hws[IMX6SX_CLK_AUDIO_PODF]->clk, 24000000);
-- 
2.37.1