linux-kernel - Re: [PATCH v5 15/25] PM / devfreq: rockchip-dfi: give variable a better name

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Date:   Tue, 13 Jun 2023 19:16:24 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>, kernel@...gutronix.de,
        Michael Riesch <michael.riesch@...fvision.net>,
        Robin Murphy <robin.murphy@....com>,
        Vincent Legoll <vincent.legoll@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 15/25] PM / devfreq: rockchip-dfi: give variable a
 better name

Hi,

On Wed, May 24, 2023 at 10:31:43AM +0200, Sascha Hauer wrote:
> struct dmc_count_channel::total counts the clock cycles of the DDR
> controller. Rename it accordingly to give the reader a better idea
> what this is about. While at it, at some documentation to struct
> dmc_count_channel.
> 
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

>  drivers/devfreq/event/rockchip-dfi.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
> index 8a7af7c32ae0d..50e497455dc69 100644
> --- a/drivers/devfreq/event/rockchip-dfi.c
> +++ b/drivers/devfreq/event/rockchip-dfi.c
> @@ -46,9 +46,14 @@
>  #define DDRMON_CH1_COUNT_NUM		0x3c
>  #define DDRMON_CH1_DFI_ACCESS_NUM	0x40
>  
> +/**
> + * struct dmc_count_channel - structure to hold counter values from the DDR controller
> + * @access:       Number of read and write accesses
> + * @clock_cycles: DDR clock cycles
> + */
>  struct dmc_count_channel {
>  	u32 access;
> -	u32 total;
> +	u32 clock_cycles;
>  };
>  
>  struct dmc_count {
> @@ -150,7 +155,7 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun
>  			continue;
>  		count->c[i].access = readl_relaxed(dfi_regs +
>  				DDRMON_CH0_DFI_ACCESS_NUM + i * 20);
> -		count->c[i].total = readl_relaxed(dfi_regs +
> +		count->c[i].clock_cycles = readl_relaxed(dfi_regs +
>  				DDRMON_CH0_COUNT_NUM + i * 20);
>  	}
>  }
> @@ -182,29 +187,29 @@ static int rockchip_dfi_get_event(struct devfreq_event_dev *edev,
>  	struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev);
>  	struct dmc_count count;
>  	struct dmc_count *last = &dfi->last_event_count;
> -	u32 access = 0, total = 0;
> +	u32 access = 0, clock_cycles = 0;
>  	int i;
>  
>  	rockchip_dfi_read_counters(dfi, &count);
>  
>  	/* We can only report one channel, so find the busiest one */
>  	for (i = 0; i < DMC_MAX_CHANNELS; i++) {
> -		u32 a, t;
> +		u32 a, c;
>  
>  		if (!(dfi->channel_mask & BIT(i)))
>  			continue;
>  
>  		a = count.c[i].access - last->c[i].access;
> -		t = count.c[i].total - last->c[i].total;
> +		c = count.c[i].clock_cycles - last->c[i].clock_cycles;
>  
>  		if (a > access) {
>  			access = a;
> -			total = t;
> +			clock_cycles = c;
>  		}
>  	}
>  
>  	edata->load_count = access * 4;
> -	edata->total_count = total;
> +	edata->total_count = clock_cycles;
>  
>  	dfi->last_event_count = count;
>  
> -- 
> 2.39.2
> 

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