linux-kernel - Re: [PATCH v1 3/4] clk: rockchip: support more core div setting

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Message-ID: <5312231.BaHzMo0RvP@diego>
Date:   Tue, 23 Feb 2021 11:22:30 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     sboyd@...nel.org, Elaine Zhang <zhangqing@...k-chips.com>
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        cl@...k-chips.com, huangtao@...k-chips.com,
        kever.yang@...k-chips.com, tony.xie@...k-chips.com,
        finley.xiao@...k-chips.com, Elaine Zhang <zhangqing@...k-chips.com>
Subject: Re: [PATCH v1 3/4] clk: rockchip: support more core div setting

Hi Elaine,

Am Dienstag, 23. Februar 2021, 10:53:51 CET schrieb Elaine Zhang:
> A55 supports each core to work at different frequencies, and each core
> has an independent divider control.
> 
> Signed-off-by: Elaine Zhang <zhangqing@...k-chips.com>
> ---
>  drivers/clk/rockchip/clk-cpu.c | 25 +++++++++++++++++++++++++
>  drivers/clk/rockchip/clk.h     | 17 ++++++++++++++++-
>  2 files changed, 41 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/rockchip/clk-cpu.c b/drivers/clk/rockchip/clk-cpu.c
> index fa9027fb1920..cac06f4f7573 100644
> --- a/drivers/clk/rockchip/clk-cpu.c
> +++ b/drivers/clk/rockchip/clk-cpu.c
> @@ -164,6 +164,18 @@ static int rockchip_cpuclk_pre_rate_change(struct rockchip_cpuclk *cpuclk,
>  				     reg_data->mux_core_mask,
>  				     reg_data->mux_core_shift),
>  		       cpuclk->reg_base + reg_data->core_reg);
> +		if (reg_data->core1_reg)
> +			writel(HIWORD_UPDATE(alt_div, reg_data->div_core1_mask,
> +					     reg_data->div_core1_shift),
> +			       cpuclk->reg_base + reg_data->core1_reg);
> +		if (reg_data->core2_reg)
> +			writel(HIWORD_UPDATE(alt_div, reg_data->div_core2_mask,
> +					     reg_data->div_core2_shift),
> +			       cpuclk->reg_base + reg_data->core2_reg);
> +		if (reg_data->core3_reg)
> +			writel(HIWORD_UPDATE(alt_div, reg_data->div_core3_mask,
> +					     reg_data->div_core3_shift),
> +			       cpuclk->reg_base + reg_data->core3_reg);

for (i = 0; i < reg_data->num_cores; i++)
	writel(...)

>  	} else {
>  		/* select alternate parent */
>  		writel(HIWORD_UPDATE(reg_data->mux_core_alt,
> @@ -209,6 +221,19 @@ static int rockchip_cpuclk_post_rate_change(struct rockchip_cpuclk *cpuclk,
>  				reg_data->mux_core_shift),
>  	       cpuclk->reg_base + reg_data->core_reg);
>  
> +	if (reg_data->core1_reg)
> +		writel(HIWORD_UPDATE(0, reg_data->div_core1_mask,
> +				     reg_data->div_core1_shift),
> +		       cpuclk->reg_base + reg_data->core1_reg);
> +	if (reg_data->core2_reg)
> +		writel(HIWORD_UPDATE(0, reg_data->div_core2_mask,
> +				     reg_data->div_core2_shift),
> +		       cpuclk->reg_base + reg_data->core2_reg);
> +	if (reg_data->core3_reg)
> +		writel(HIWORD_UPDATE(0, reg_data->div_core3_mask,
> +				     reg_data->div_core3_shift),
> +		       cpuclk->reg_base + reg_data->core3_reg);
> +

for (i = 0; i < reg_data->num_cores; i++)
	writel(...)

>  	if (ndata->old_rate > ndata->new_rate)
>  		rockchip_cpuclk_set_dividers(cpuclk, rate);
>  
> diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
> index 2271a84124b0..b46c93fd0cb5 100644
> --- a/drivers/clk/rockchip/clk.h
> +++ b/drivers/clk/rockchip/clk.h
> @@ -322,7 +322,7 @@ struct rockchip_cpuclk_clksel {
>  	u32 val;
>  };
>  
> -#define ROCKCHIP_CPUCLK_NUM_DIVIDERS	2
> +#define ROCKCHIP_CPUCLK_NUM_DIVIDERS	5

please move this into a separate patch, as yes the rk3568 needs more
dividers but that isn't related to adding separate core divider controls.

[...]
add

#define ROCKCHIP_CPUCLK_MAX_CORES	4

>  struct rockchip_cpuclk_rate_table {
>  	unsigned long prate;
>  	struct rockchip_cpuclk_clksel divs[ROCKCHIP_CPUCLK_NUM_DIVIDERS];
> @@ -333,6 +333,12 @@ struct rockchip_cpuclk_rate_table {
>   * @core_reg:		register offset of the core settings register
>   * @div_core_shift:	core divider offset used to divide the pll value
>   * @div_core_mask:	core divider mask
> + * @div_core1_shift:	core1 divider offset used to divide the pll value
> + * @div_core1_mask:	core1 divider mask
> + * @div_core2_shift:	core2 divider offset used to divide the pll value
> + * @div_core2_mask:	core2 divider mask
> + * @div_core3_shift:	core3 divider offset used to divide the pll value
> + * @div_core3_mask:	core3 divider mask
>   * @mux_core_alt:	mux value to select alternate parent
>   * @mux_core_main:	mux value to select main parent of core
>   * @mux_core_shift:	offset of the core multiplexer
> @@ -342,6 +348,15 @@ struct rockchip_cpuclk_reg_data {
>  	int		core_reg;
>  	u8		div_core_shift;
>  	u32		div_core_mask;
> +	int		core1_reg;
> +	u8		div_core1_shift;
> +	u32		div_core1_mask;
> +	int		core2_reg;
> +	u8		div_core2_shift;
> +	u32		div_core2_mask;
> +	int		core3_reg;
> +	u8		div_core3_shift;
> +	u32		div_core3_mask;

please make this instead like:

int	core_reg[ROCKCHIP_CPUCLK_MAX_CORES];
u8	div_core_shift[ROCKCHIP_CPUCLK_MAX_CORES];
u32	div_core_mask[ROCKCHIP_CPUCLK_MAX_CORES];
int	num_cores;


Thanks
Heiko


>  	u8		mux_core_alt;
>  	u8		mux_core_main;
>  	u8		mux_core_shift;
>