linux-kernel - Re: [PATCH 01/12] OPP: Allow required-opps even if the device doesn't have power-domains

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Date:   Wed, 20 May 2020 16:54:06 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     "Andrew-sh.Cheng" <andrew-sh.cheng@...iatek.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        srv_heupstream@...iatek.com, Saravana Kannan <saravanak@...gle.com>
Subject: Re: [PATCH 01/12] OPP: Allow required-opps even if the device doesn't
 have power-domains



On 20/05/2020 05:42, Andrew-sh.Cheng wrote:
> From: Saravana Kannan <saravanak@...gle.com>
> 
> A Device-A can have a (minimum) performance requirement on another
> Device-B to be able to function correctly. This performance requirement
> on Device-B can also change based on the current performance level of
> Device-A.
> 
> The existing required-opps feature fits well to describe this need. So,
> instead of limiting required-opps to point to only PM-domain devices,
> allow it to point to any device.
> 
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

Please check all patches, they are missing your
Signed-off-by

Regards,
Matthias

> ---
>  drivers/opp/core.c |  2 +-
>  drivers/opp/of.c   | 11 -----------
>  2 files changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index ba43e6a3dc0a..51403c1f2481 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -755,7 +755,7 @@ static int _set_required_opps(struct device *dev,
>  		return 0;
>  
>  	/* Single genpd case */
> -	if (!genpd_virt_devs) {
> +	if (!genpd_virt_devs && required_opp_tables[0]->is_genpd) {
>  		pstate = likely(opp) ? opp->required_opps[0]->pstate : 0;
>  		ret = dev_pm_genpd_set_performance_state(dev, pstate);
>  		if (ret) {
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index 9cd8f0adacae..6d33de668a7b 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -195,17 +195,6 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
>  
>  		if (IS_ERR(required_opp_tables[i]))
>  			goto free_required_tables;
> -
> -		/*
> -		 * We only support genpd's OPPs in the "required-opps" for now,
> -		 * as we don't know how much about other cases. Error out if the
> -		 * required OPP doesn't belong to a genpd.
> -		 */
> -		if (!required_opp_tables[i]->is_genpd) {
> -			dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
> -				required_np);
> -			goto free_required_tables;
> -		}
>  	}
>  
>  	goto put_np;
>