From: Viresh Kumar <viresh.kumar@linaro.org>
To: Johan Hovold <johan@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
Chanwoo Choi <cw00.choi@samsung.com>,
Dmitry Osipenko <digetx@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Nishanth Menon <nm@ti.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Stephen Boyd <sboyd@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Viresh Kumar <vireshk@kernel.org>,
linux-pm@vger.kernel.org,
Vincent Guittot <vincent.guittot@linaro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
devicetree@vger.kernel.org,
Dmitry Osipenko <dmitry.osipenko@collabora.com>,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
Rob Herring <robh@kernel.org>
Subject: Re: [PATCH V2 00/13] OPP: Add support for multiple clocks*
Date: Tue, 12 Jul 2022 13:22:40 +0530 [thread overview]
Message-ID: <20220712075240.lsjd42yhcskqlzrh@vireshk-i7> (raw)
In-Reply-To: <YsxSkswzsqgMOc0l@hovoldconsulting.com>
On 11-07-22, 18:40, Johan Hovold wrote:
> This break OPP parsing on SC8280XP and hence cpufreq and other things:
>
> [ +0.010890] cpu cpu0: _opp_add_static_v2: opp key field not found
> [ +0.000019] cpu cpu0: _of_add_opp_table_v2: Failed to add OPP, -19
> [ +0.000060] cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 300000000, volt: 576000, enabled: 1. New: freq: 403200000, volt: 576000, enabled: 1
> [ +0.000030] cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 300000000, volt: 576000, enabled: 1. New: freq: 499200000, volt: 576000, enabled: 1
> ...
>
> I just did a rebase on next-20220708 and hit this.
>
> I've narrowed it down to _read_rate() now returning -ENODEV since
> opp_table->clk_count is zero.
>
> Similar to what was reported for tegra for v1:
>
> https://lore.kernel.org/all/58cc8e3c-74d4-e432-8502-299312a1f15e@collabora.com/
>
> I don't have time to look at this any more today, but it would we nice
> if you could unbreak linux-next.
>
> Perhaps Bjorn or Mani can help with further details, but this doesn't
> look like something that is specific to SC8280XP.
It is actually. This is yet another corner case, Tegra had one as
well.
I have tried to understand the Qcom code / setup to best of my
abilities, and the problem as per me is that qcom-cpufreq-hw doesn't
provide a clk to the OPP core, which breaks it after the new updates
to the OPP core. I believe following will solve it. Can someone please
try this ? I will then merge it with the right commit.
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 666e1ebf91d1..4f4a285886fa 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1384,6 +1384,20 @@ static struct opp_table *_update_opp_table_clk(struct device *dev,
}
if (ret == -ENOENT) {
+ /*
+ * There are few platforms which don't want the OPP core to
+ * manage device's clock settings. In such cases neither the
+ * platform provides the clks explicitly to us, nor the DT
+ * contains a valid clk entry. The OPP nodes in DT may still
+ * contain "opp-hz" property though, which we need to parse and
+ * allow the platform to find an OPP based on freq later on.
+ *
+ * This is a simple solution to take care of such corner cases,
+ * i.e. make the clk_count 1, which lets us allocate space for
+ * frequency in opp->rates and also parse the entries in DT.
+ */
+ opp_table->clk_count = 1;
+
dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
return opp_table;
}
--
viresh
next prev parent reply other threads:[~2022-07-12 7:52 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-05 7:00 [PATCH V2 00/13] OPP: Add support for multiple clocks* Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 01/13] OPP: Use consistent names for OPP table instances Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 02/13] OPP: Remove rate_not_available parameter to _opp_add() Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 03/13] OPP: Reuse _opp_compare_key() in _opp_add_static_v2() Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 04/13] OPP: Make dev_pm_opp_set_opp() independent of frequency Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 05/13] dt-bindings: opp: accept array of frequencies Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 06/13] OPP: Allow multiple clocks for a device Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 07/13] OPP: Compare bandwidths for all paths in _opp_compare_key() Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 08/13] OPP: Add key specific assert() method to key finding helpers Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 09/13] OPP: Assert clk_count == 1 for single clk helpers Viresh Kumar
2022-07-05 17:21 ` Krzysztof Kozlowski
2022-07-06 6:39 ` Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 10/13] OPP: Provide a simple implementation to configure multiple clocks Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 11/13] OPP: Allow config_clks helper for single clk case Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 12/13] PM / devfreq: tegra30: Register config_clks helper Viresh Kumar
2022-07-05 7:00 ` [PATCH V2 13/13] OPP: Remove dev{m}_pm_opp_of_add_table_noclk() Viresh Kumar
2022-07-07 19:43 ` [PATCH V2 00/13] OPP: Add support for multiple clocks* Dmitry Osipenko
2022-07-08 7:19 ` Viresh Kumar
2022-07-08 7:26 ` Dmitry Osipenko
2022-07-08 7:30 ` Dmitry Osipenko
2022-07-08 8:13 ` Viresh Kumar
2022-07-08 8:12 ` Viresh Kumar
2022-07-08 16:15 ` Dmitry Osipenko
2022-07-11 16:40 ` Johan Hovold
2022-07-12 7:52 ` Viresh Kumar [this message]
2022-07-12 12:25 ` Manivannan Sadhasivam
2022-07-12 14:29 ` Johan Hovold
2022-07-12 15:10 ` Viresh Kumar
2022-07-12 15:55 ` Johan Hovold
2022-07-13 6:55 ` Viresh Kumar
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