linux-kernel - Re: [PATCH v2] opp: Power on (virtual) power domains managed by the OPP core

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Date:   Thu, 27 Aug 2020 15:31:04 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Niklas Cassel <nks@...wful.org>
Subject: Re: [PATCH v2] opp: Power on (virtual) power domains managed by the
 OPP core

On 26-08-20, 11:33, Stephan Gerhold wrote:
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 8b3c3986f589..7e53a7b94c59 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -17,6 +17,7 @@
>  #include <linux/device.h>
>  #include <linux/export.h>
>  #include <linux/pm_domain.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
>  
>  #include "opp.h"
> @@ -1964,10 +1965,13 @@ static void _opp_detach_genpd(struct opp_table *opp_table)
>  		if (!opp_table->genpd_virt_devs[index])
>  			continue;
>  
> +		if (opp_table->genpd_virt_links && opp_table->genpd_virt_links[index])
> +			device_link_del(opp_table->genpd_virt_links[index]);
>  		dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
>  		opp_table->genpd_virt_devs[index] = NULL;
>  	}
>  
> +	kfree(opp_table->genpd_virt_links);
>  	kfree(opp_table->genpd_virt_devs);
>  	opp_table->genpd_virt_devs = NULL;
>  }
> @@ -1999,8 +2003,10 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
>  {
>  	struct opp_table *opp_table;
>  	struct device *virt_dev;
> -	int index = 0, ret = -EINVAL;
> +	struct device_link *dev_link;
> +	int index = 0, ret = -EINVAL, num_devs;
>  	const char **name = names;
> +	u32 flags;
>  
>  	opp_table = dev_pm_opp_get_opp_table(dev);
>  	if (IS_ERR(opp_table))
> @@ -2049,6 +2055,32 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,

I was about to apply this patch when I noticed that this routine does
return the array of virtual devices back to the caller, like the qcom
cpufreq driver in this case. IIRC we did it this way as a generic
solution for this in the OPP core wasn't preferable.

And so I think again if this patch should be picked instead of letting
the platform handle this ?

-- 
viresh