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

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Date:   Thu, 25 Feb 2021 10:59:32 +0800
From:   "elaine.zhang" <zhangqing@...k-chips.com>
To:     Heiko Stübner <heiko@...ech.de>, sboyd@...nel.org
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
Subject: Re: [PATCH v1 3/4] clk: rockchip: support more core div setting

Hi,Heiko:

在 2021/2/23 下午6:22, Heiko Stübner 写道:
> 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;
This is also my original intention, but with such modification, other 
SOCs of RK need to be modified, otherwise they cannot be compatible with 
the old SOC.
>
>
> Thanks
> Heiko
>
>
>>   	u8		mux_core_alt;
>>   	u8		mux_core_main;
>>   	u8		mux_core_shift;
>>
>
>
>
>
>