MLK-14679-1: ARM: clk: spdif clock rate is too high for asrc

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).

Reviewed-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
(cherry picked from commit 31c28c8fd66bfee7107f8161133cc8f97ea00a31)
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>

drivers/clk/imx/clk-imx6sx.c

@@ -609,7 +609,7 @@ 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);