linux-kernel - Re: [PATCH v4 4/4] opp: Make _set_opp

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Message-ID: <20210122072626.mlbthef43hjldnyr@vireshk-i7>
Date:   Fri, 22 Jan 2021 12:56:26 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 4/4] opp: Make _set_opp_custom() work without
 regulators

On 21-01-21, 01:26, Dmitry Osipenko wrote:
> Check whether OPP table has regulators in _set_opp_custom() and set up
> dev_pm_set_opp_data accordingly. Now _set_opp_custom() works properly,
> i.e. it doesn't crash if OPP table doesn't have assigned regulators.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/opp/core.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)

I have applied this instead:

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 32d653774adc..805fc2602808 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -828,24 +828,31 @@ static int _set_opp_custom(const struct opp_table *opp_table,
                           struct dev_pm_opp_supply *old_supply,
                           struct dev_pm_opp_supply *new_supply)
 {
-       struct dev_pm_set_opp_data *data;
+       struct dev_pm_set_opp_data *data = opp_table->set_opp_data;
        int size;
 
-       data = opp_table->set_opp_data;
+       /*
+        * We support this only if dev_pm_opp_set_regulators() was called
+        * earlier.
+        */
+       if (opp_table->sod_supplies) {
+               size = sizeof(*old_supply) * opp_table->regulator_count;
+               if (!old_supply)
+                       memset(data->old_opp.supplies, 0, size);
+               else
+                       memcpy(data->old_opp.supplies, old_supply, size);
+
+               memcpy(data->new_opp.supplies, new_supply, size);
+               data->regulator_count = opp_table->regulator_count;
+       } else {
+               data->regulator_count = 0;
+       }
+
        data->regulators = opp_table->regulators;
-       data->regulator_count = opp_table->regulator_count;
        data->clk = opp_table->clk;
        data->dev = dev;
-
        data->old_opp.rate = old_freq;
-       size = sizeof(*old_supply) * opp_table->regulator_count;
-       if (!old_supply)
-               memset(data->old_opp.supplies, 0, size);
-       else
-               memcpy(data->old_opp.supplies, old_supply, size);
-
        data->new_opp.rate = freq;
-       memcpy(data->new_opp.supplies, new_supply, size);
 
        return opp_table->set_opp(data);
 }


-- 
viresh