[U-Boot] [PATCH] arm: socfpga: set the mpuclk divider in the Altera group register

[Marek Vasut]

On 01/31/2017 07:33 PM, Dinh Nguyen wrote:
> The mpuclk register in the Altera group of the clock manager
> divides the mpu_clk that is generated from the C0 output of the main
> pll.
> 
> Without this patch, the default value of the register is 1, so the mpuclk
> will always get divided by 2 if the correct value is not set. For example,
> on the Arria5 socdk board, the MPU clock is only 525 MHz, and it should be
> 1.05 GHz.
> 
> Signed-off-by: Dinh Nguyen <dinguyen at kernel.org>

Reviewed-by: Marek Vasut <marex at denx.de>

That's real neat, does that mean we get up to twice as much performance?

> ---
>  arch/arm/mach-socfpga/clock_manager.c              | 3 +++
>  arch/arm/mach-socfpga/include/mach/clock_manager.h | 3 +++
>  arch/arm/mach-socfpga/wrap_pll_config.c            | 3 +++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/arch/arm/mach-socfpga/clock_manager.c b/arch/arm/mach-socfpga/clock_manager.c
> index aa71636..29e18f8 100644
> --- a/arch/arm/mach-socfpga/clock_manager.c
> +++ b/arch/arm/mach-socfpga/clock_manager.c
> @@ -167,6 +167,9 @@ void cm_basic_init(const struct cm_config * const cfg)
>  	/* main mpu */
>  	writel(cfg->mpuclk, &clock_manager_base->main_pll.mpuclk);
>  
> +	/* altera group mpuclk */
> +	writel(cfg->altera_grp_mpuclk, &clock_manager_base->altera.mpuclk);
> +
>  	/* main main clock */
>  	writel(cfg->mainclk, &clock_manager_base->main_pll.mainclk);
>  
> diff --git a/arch/arm/mach-socfpga/include/mach/clock_manager.h b/arch/arm/mach-socfpga/include/mach/clock_manager.h
> index 2675951..803c926 100644
> --- a/arch/arm/mach-socfpga/include/mach/clock_manager.h
> +++ b/arch/arm/mach-socfpga/include/mach/clock_manager.h
> @@ -55,6 +55,9 @@ struct cm_config {
>  	uint32_t ddr2xdqsclk;
>  	uint32_t ddrdqclk;
>  	uint32_t s2fuser2clk;
> +
> +	/* altera group */
> +	uint32_t altera_grp_mpuclk;
>  };
>  
>  void cm_basic_init(const struct cm_config * const cfg);
> diff --git a/arch/arm/mach-socfpga/wrap_pll_config.c b/arch/arm/mach-socfpga/wrap_pll_config.c
> index 8a0a0e6..72b5f92 100644
> --- a/arch/arm/mach-socfpga/wrap_pll_config.c
> +++ b/arch/arm/mach-socfpga/wrap_pll_config.c
> @@ -116,6 +116,9 @@ static const struct cm_config cm_default_cfg = {
>  		CLKMGR_SDRPLLGRP_S2FUSER2CLK_PHASE_OFFSET) |
>  	(CONFIG_HPS_SDRPLLGRP_S2FUSER2CLK_CNT <<
>  		CLKMGR_SDRPLLGRP_S2FUSER2CLK_CNT_OFFSET),
> +
> +	/* altera group */
> +	CONFIG_HPS_ALTERAGRP_MPUCLK,
>  };
>  
>  const struct cm_config * const cm_get_default_config(void)
> 


-- 
Best regards,
Marek Vasut