linux-kernel - Re: [PATCH v2 2/3] interconnect: imx: Add imx_icc_get_bw and imx_icc

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Date:   Sat, 1 Jan 2022 20:26:05 +0200
From:   Georgi Djakov <djakov@...nel.org>
To:     Abel Vesa <abel.vesa@....com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] interconnect: imx: Add imx_icc_get_bw and
 imx_icc_aggregate functions

Hi Abel,

On 1.01.22 18:39, Abel Vesa wrote:
> The aggregate function will return whatever is the highest
> rate for that specific node. The imx_icc_get_bw sets the

Adding some more details about why we switch from
icc_std_aggregate to imx_icc_aggregate would be nice.

> initial avg and peak to 0 in order to avoid setting them to
> INT_MAX by the interconnect core.

Do we need a Fixes tag for this?

I would recommend to split imx_icc_get_bw and imx_icc_aggregate
changes into separate patches. These also seem to be unrelated to
the imx_icc_node_adj_desc patchset.

Thanks,
Georgi

> Signed-off-by: Abel Vesa <abel.vesa@....com>
> ---
> 
> No changes since v1.
> 
>   drivers/interconnect/imx/imx.c | 20 +++++++++++++++++++-
>   1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/interconnect/imx/imx.c b/drivers/interconnect/imx/imx.c
> index 34bfc7936387..4d8a2a2d2608 100644
> --- a/drivers/interconnect/imx/imx.c
> +++ b/drivers/interconnect/imx/imx.c
> @@ -25,6 +25,23 @@ struct imx_icc_node {
>   	struct dev_pm_qos_request qos_req;
>   };
>   
> +static int imx_icc_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
> +{
> +	*avg = 0;
> +	*peak = 0;
> +
> +	return 0;
> +}
> +
> +static int imx_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
> +		      u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
> +{
> +	*agg_avg = max(*agg_avg, avg_bw);
> +	*agg_peak = max(*agg_peak, peak_bw);
> +
> +	return 0;
> +}
> +
>   static int imx_icc_node_set(struct icc_node *node)
>   {
>   	struct device *dev = node->provider->dev;
> @@ -233,7 +250,8 @@ int imx_icc_register(struct platform_device *pdev,
>   	if (!provider)
>   		return -ENOMEM;
>   	provider->set = imx_icc_set;
> -	provider->aggregate = icc_std_aggregate;
> +	provider->get_bw = imx_icc_get_bw;
> +	provider->aggregate = imx_icc_aggregate;
>   	provider->xlate = of_icc_xlate_onecell;
>   	provider->data = data;
>   	provider->dev = dev;