linux-kernel - RE: [PATCH v8 15/26] PM / devfreq: rockchip-dfi: give variable a better name

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Date:   Thu, 19 Oct 2023 20:59:12 +0900
From:   "Chanwoo Choi" <cw00.choi@...sung.com>
To:     "'Sascha Hauer'" <s.hauer@...gutronix.de>,
        <linux-rockchip@...ts.infradead.org>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        "'Heiko Stuebner'" <heiko@...ech.de>,
        "'Chanwoo Choi'" <chanwoo@...nel.org>,
        "'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>,
        "'Sebastian Reichel'" <sebastian.reichel@...labora.com>
Subject: RE: [PATCH v8 15/26] PM / devfreq: rockchip-dfi: give variable a
 better name



> -----Original Message-----
> From: Sascha Hauer <s.hauer@...gutronix.de>
> Sent: Wednesday, October 18, 2023 3:17 PM
> To: linux-rockchip@...ts.infradead.org
> Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> linux-pm@...r.kernel.org; Heiko Stuebner <heiko@...ech.de>; Chanwoo Choi
> <chanwoo@...nel.org>; 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; Sebastian Reichel
> <sebastian.reichel@...labora.com>; Sascha Hauer <s.hauer@...gutronix.de>;
> Chanwoo Choi <cw00.choi@...sung.com>
> Subject: [PATCH v8 15/26] PM / devfreq: rockchip-dfi: give variable a
> better name
> 
> 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.
> 
> Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> Acked-by: Chanwoo Choi <cw00.choi@...sung.com>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>  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 7a4f1901314d4..3d5c6d737ccd9 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 {
> @@ -151,7 +156,7 @@ 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);
>  	}
>  }
> @@ -183,29 +188,29 @@ 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 < dfi->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


Applied it. Thanks

Best Regards,
Chanwoo Choi