linux-kernel - Re: [PATCH 04/10] soc: qcom: icc-bwmon: store reference to varian data in container

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Message-ID: <a9597cd4-be40-c68e-f83c-179f85c4b02d@quicinc.com>
Date:   Tue, 26 Jul 2022 16:58:47 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "Konrad Dybcio" <konrad.dybcio@...ainline.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH 04/10] soc: qcom: icc-bwmon: store reference to varian
 data in container



On 7/21/22 12:58 AM, Krzysztof Kozlowski wrote:
> Instead of copying pieces of variant-specific data (struct
> icc_bwmon_data) into the state container (struct icc_bwmon), just store
> a pointer to it.
> 
> This simplifies a bit the code and allows later to grow easily the
> variant-specific data for new BWMON v5.
> 
> Cc: Rajendra Nayak <quic_rjendra@...cinc.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Patch subject has a typo s/varian/variant

Reviewed-by: Sibi Sankar <quic_sibis@...cinc.com>
> ---
>   drivers/soc/qcom/icc-bwmon.c | 20 ++++++++------------
>   1 file changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c
> index b76a59d9002c..93c3cec84721 100644
> --- a/drivers/soc/qcom/icc-bwmon.c
> +++ b/drivers/soc/qcom/icc-bwmon.c
> @@ -118,11 +118,10 @@ struct icc_bwmon_data {
>   
>   struct icc_bwmon {
>   	struct device *dev;
> +	const struct icc_bwmon_data *data;
>   	void __iomem *base;
>   	int irq;
>   
> -	unsigned int default_lowbw_kbps;
> -	unsigned int sample_ms;
>   	unsigned int max_bw_kbps;
>   	unsigned int min_bw_kbps;
>   	unsigned int target_kbps;
> @@ -199,20 +198,20 @@ static void bwmon_set_threshold(struct icc_bwmon *bwmon, unsigned int reg,
>   {
>   	unsigned int thres;
>   
> -	thres = mult_frac(bwmon_kbps_to_count(kbps), bwmon->sample_ms,
> +	thres = mult_frac(bwmon_kbps_to_count(kbps), bwmon->data->sample_ms,
>   			  MSEC_PER_SEC);
>   	writel_relaxed(thres, bwmon->base + reg);
>   }
>   
> -static void bwmon_start(struct icc_bwmon *bwmon,
> -			const struct icc_bwmon_data *data)
> +static void bwmon_start(struct icc_bwmon *bwmon)
>   {
> +	const struct icc_bwmon_data *data = bwmon->data;
>   	unsigned int thres_count;
>   	int window;
>   
>   	bwmon_clear_counters(bwmon);
>   
> -	window = mult_frac(bwmon->sample_ms, HW_TIMER_HZ, MSEC_PER_SEC);
> +	window = mult_frac(bwmon->data->sample_ms, HW_TIMER_HZ, MSEC_PER_SEC);
>   	/* Maximum sampling window: 0xfffff */
>   	writel_relaxed(window, bwmon->base + BWMON_SAMPLE_WINDOW);
>   
> @@ -267,7 +266,7 @@ static irqreturn_t bwmon_intr(int irq, void *dev_id)
>   	 */
>   	max = readl(bwmon->base + BWMON_ZONE_MAX(zone)) + 1;
>   	max *= BWMON_COUNT_UNIT_KB;
> -	bwmon->target_kbps = mult_frac(max, MSEC_PER_SEC, bwmon->sample_ms);
> +	bwmon->target_kbps = mult_frac(max, MSEC_PER_SEC, bwmon->data->sample_ms);
>   
>   	return IRQ_WAKE_THREAD;
>   }
> @@ -329,14 +328,13 @@ static int bwmon_probe(struct platform_device *pdev)
>   	struct device *dev = &pdev->dev;
>   	struct dev_pm_opp *opp;
>   	struct icc_bwmon *bwmon;
> -	const struct icc_bwmon_data *data;
>   	int ret;
>   
>   	bwmon = devm_kzalloc(dev, sizeof(*bwmon), GFP_KERNEL);
>   	if (!bwmon)
>   		return -ENOMEM;
>   
> -	data = of_device_get_match_data(dev);
> +	bwmon->data = of_device_get_match_data(dev);
>   
>   	bwmon->base = devm_platform_ioremap_resource(pdev, 0);
>   	if (IS_ERR(bwmon->base)) {
> @@ -364,8 +362,6 @@ static int bwmon_probe(struct platform_device *pdev)
>   	if (IS_ERR(opp))
>   		return dev_err_probe(dev, ret, "failed to find min peak bandwidth\n");
>   
> -	bwmon->sample_ms = data->sample_ms;
> -	bwmon->default_lowbw_kbps = data->default_lowbw_kbps;
>   	bwmon->dev = dev;
>   
>   	bwmon_disable(bwmon);
> @@ -376,7 +372,7 @@ static int bwmon_probe(struct platform_device *pdev)
>   		return dev_err_probe(dev, ret, "failed to request IRQ\n");
>   
>   	platform_set_drvdata(pdev, bwmon);
> -	bwmon_start(bwmon, data);
> +	bwmon_start(bwmon);
>   
>   	return 0;
>   }
>