linux-kernel - Re: [PATCH RFC 1/8] opp: core: implement dev_pm_opp_get

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Message-ID: <20241114041044.esfazw5mv6zfyrix@vireshk-i7>
Date: Thu, 14 Nov 2024 09:40:44 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Akhil P Oommen <quic_akhilpo@...cinc.com>,
	Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
	Stephen Boyd <sboyd@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Bjorn Andersson <andersson@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Connor Abbott <cwabbott0@...il.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 1/8] opp: core: implement dev_pm_opp_get_bandwidth

On 13-11-24, 16:48, Neil Armstrong wrote:
> Add and implement the dev_pm_opp_get_bandwidth() to retrieve
> the OPP's bandwidth in the same was as the dev_pm_opp_get_voltage()

                                  way

> helper.
> 
> Retrieving bandwidth is required in the case of the Adreno GPU
> where the GPU Management Unit can handle the Bandwidth scaling.
> 
> The helper can get the peak or everage bandwidth for any of

                                 average

> the interconnect path.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/opp/core.c     | 25 +++++++++++++++++++++++++
>  include/linux/pm_opp.h |  7 +++++++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 494f8860220d97fc690ebab5ed3b7f5f04f22d73..19fb82033de26b74e9604c33b9781689df2fe80a 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -106,6 +106,31 @@ static bool assert_single_clk(struct opp_table *opp_table)
>  	return !WARN_ON(opp_table->clk_count > 1);
>  }
>  
> +/**
> + * dev_pm_opp_get_bandwidth() - Gets the peak bandwidth corresponding to an opp

s/peak bandwidth/bandwidth/

> + * @opp:	opp for which voltage has to be returned for
> + * @peak:	select peak or average bandwidth
> + * @index:	bandwidth index
> + *
> + * Return: peak bandwidth in kBps, else return 0

s/peak bandwidth/bandwidth/

> + */
> +unsigned long dev_pm_opp_get_bandwidth(struct dev_pm_opp *opp, bool peak, int index)
> +{
> +	if (IS_ERR_OR_NULL(opp)) {
> +		pr_err("%s: Invalid parameters\n", __func__);
> +		return 0;
> +	}
> +
> +	if (index > opp->opp_table->path_count)
> +		return 0;
> +
> +	if (!opp->bandwidth)
> +		return 0;
> +
> +	return peak ? opp->bandwidth[index].peak : opp->bandwidth[index].avg;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_get_bandwidth);

All other bandwidth APIs are named as _bw, maybe do same here too ?

-- 
viresh