Re: [PATCH] opp: of: Allow lazy-linking of required-opps to non genpd

[Viresh Kumar <viresh.kumar@linaro.org>]

On 16-06-21, 13:33, Hsin-Yi Wang wrote:
> Don't limit required_opp_table to genpd only. One possible use case is
> cpufreq based devfreq governor, which can use required-opps property to
> derive devfreq from cpufreq.
> 
> Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
> This is tested with the non genpd case mt8183-cci with passive
> governor[1].
> [1] https://patchwork.kernel.org/project/linux-mediatek/patch/1616499241-4906-2-git-send-email-andrew-sh.cheng@mediatek.com/
> ---
>  drivers/opp/of.c | 20 +-------------------
>  1 file changed, 1 insertion(+), 19 deletions(-)
> 
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index aa75a1caf08a3..9573facce53a5 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -201,17 +201,6 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
>  			lazy = true;
>  			continue;
>  		}
> -
> -		/*
> -		 * 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;
> -		}
>  	}
>  
>  	/* Let's do the linking later on */
> @@ -379,13 +368,6 @@ static void lazy_link_required_opp_table(struct opp_table *new_table)
>  	struct dev_pm_opp *opp;
>  	int i, ret;
>  
> -	/*
> -	 * We only support genpd's OPPs in the "required-opps" for now,
> -	 * as we don't know much about other cases.
> -	 */
> -	if (!new_table->is_genpd)
> -		return;
> -
>  	mutex_lock(&opp_table_lock);
>  
>  	list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) {
> @@ -873,7 +855,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
>  		return ERR_PTR(-ENOMEM);
>  
>  	ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
> -	if (ret < 0 && !opp_table->is_genpd) {
> +	if (ret < 0) {
>  		dev_err(dev, "%s: opp key field not found\n", __func__);
>  		goto free_opp;
>  	}

Plus this and few changes to commit log.

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e366218d6736..b335c077f215 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -893,6 +893,16 @@ static int _set_required_opps(struct device *dev,
        if (!required_opp_tables)
                return 0;
 
+       /*
+        * We only support genpd's OPPs in the "required-opps" for now, as we
+        * don't know much about other use cases. Error out if the required OPP
+        * doesn't belong to a genpd.
+        */
+       if (unlikely(!required_opp_tables[0]->is_genpd)) {
+               dev_err(dev, "required-opps don't belong to a genpd\n");
+               return -ENOENT;
+       }
+
        /* required-opps not fully initialized yet */
        if (lazy_linking_pending(opp_table))
                return -EBUSY;

Applied. Thanks.

-- 
viresh