[PATCH] ARM: imx: AHB rate must be set to 132MHz on i.mx6sl

[Shawn Guo]

On Tue, Jan 07, 2014 at 12:46:04PM -0500, Anson Huang wrote:
> The reset value of AHB divider is 3, so current AHB rate
> is 99MHz which is not correct for kernel, need to ensure
> AHB rate is 132MHz in clk driver, as ipg is sourcing from
> AHB, and it should be 66MHz by default.
> 
> Signed-off-by: Anson Huang <b20788 at freescale.com>
> ---
>  arch/arm/mach-imx/clk-imx6sl.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-imx/clk-imx6sl.c b/arch/arm/mach-imx/clk-imx6sl.c
> index a747a7d..e6900e9 100644
> --- a/arch/arm/mach-imx/clk-imx6sl.c
> +++ b/arch/arm/mach-imx/clk-imx6sl.c
> @@ -1,5 +1,5 @@
>  /*
> - * Copyright 2013 Freescale Semiconductor, Inc.
> + * Copyright 2013-2014 Freescale Semiconductor, Inc.
>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as
> @@ -72,6 +72,7 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
>  	void __iomem *base;
>  	int irq;
>  	int i;
> +	int ret;
>  
>  	clks[IMX6SL_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
>  	clks[IMX6SL_CLK_CKIL] = imx_obtain_fixed_clock("ckil", 0);
> @@ -256,6 +257,11 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
>  	clk_register_clkdev(clks[IMX6SL_CLK_GPT], "ipg", "imx-gpt.0");
>  	clk_register_clkdev(clks[IMX6SL_CLK_GPT_SERIAL], "per", "imx-gpt.0");
>  
> +	/* Ensure the AHB clk is at 132MHz. */
> +	ret = clk_set_rate(clks[IMX6SL_CLK_AHB], 132000000);
> +	if (ret)
> +		pr_warn("%s: failed to set AHB clock rate %d!\n", __func__, ret);

I changed it as below to avoid one 'line over 80 characters' warning,
and applied the patch.

		pr_warn("%s: failed to set AHB clock rate %d!\n",
			__func__, ret);

Shawn

> +
>  	if (IS_ENABLED(CONFIG_USB_MXS_PHY)) {
>  		clk_prepare_enable(clks[IMX6SL_CLK_USBPHY1_GATE]);
>  		clk_prepare_enable(clks[IMX6SL_CLK_USBPHY2_GATE]);
> -- 
> 1.7.9.5
> 
>