From: Dirk Behme <dirk.behme@de.bosch.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Kevin Hilman <khilman@baylibre.com>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
linux-clk <linux-clk@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Linux PM list <linux-pm@vger.kernel.org>
Subject: Re: Clocks used by another OS/CPU
Date: Thu, 29 Jun 2017 14:07:38 +0200 [thread overview]
Message-ID: <50911172-8fa1-8341-0ed0-d40f00d9392c@de.bosch.com> (raw)
In-Reply-To: <CAMuHMdWRadUCZUycUW3dKJhS__aRRVbV1tXo0umUQ7KHOYQMoQ@mail.gmail.com>
On 29.06.2017 13:56, Geert Uytterhoeven wrote:
> Hi Dirk,
>
> On Thu, Jun 29, 2017 at 11:27 AM, Geert Uytterhoeven
> <geert@linux-m68k.org> wrote:
>> CC clock, ARM, DT, PM people
>>
>> TL;DR: Clocks may be in use by another CPU not running Linux, while Linux
>> disables them as being unused.
>
>> Of course this is not limited to clocks, but also to e.g. PM domains.
>
> BTW, how do you prevent Linux from powering down the CR7 PM domain,
> which contains the Cortex R7?
The idea is
--- a/drivers/soc/renesas/r8a7795-sysc.c
+++ b/drivers/soc/renesas/r8a7795-sysc.c
@@ -38,7 +38,8 @@ static const struct rcar_sysc_area r8a7795_areas[]
__initconst = {
{ "ca53-cpu3", 0x200, 3, R8A7795_PD_CA53_CPU3, R8A7795_PD_CA53_SCU,
PD_CPU_NOCR },
{ "a3vp", 0x340, 0, R8A7795_PD_A3VP, R8A7795_PD_ALWAYS_ON },
- { "cr7", 0x240, 0, R8A7795_PD_CR7, R8A7795_PD_ALWAYS_ON },
+ { "cr7", 0x240, 0, R8A7795_PD_CR7, R8A7795_PD_ALWAYS_ON,
+ PD_CPU_NOCR },
{ "a3vc", 0x380, 0, R8A7795_PD_A3VC, R8A7795_PD_ALWAYS_ON },
{ "a2vc0", 0x3c0, 0, R8A7795_PD_A2VC0, R8A7795_PD_A3VC },
{ "a2vc1", 0x3c0, 1, R8A7795_PD_A2VC1, R8A7795_PD_A3VC },
Not finally tested, though.
Best regards
Dirk
WARNING: multiple messages have this Message-ID (diff)
From: dirk.behme@de.bosch.com (Dirk Behme)
To: linux-arm-kernel@lists.infradead.org
Subject: Clocks used by another OS/CPU
Date: Thu, 29 Jun 2017 14:07:38 +0200 [thread overview]
Message-ID: <50911172-8fa1-8341-0ed0-d40f00d9392c@de.bosch.com> (raw)
In-Reply-To: <CAMuHMdWRadUCZUycUW3dKJhS__aRRVbV1tXo0umUQ7KHOYQMoQ@mail.gmail.com>
On 29.06.2017 13:56, Geert Uytterhoeven wrote:
> Hi Dirk,
>
> On Thu, Jun 29, 2017 at 11:27 AM, Geert Uytterhoeven
> <geert@linux-m68k.org> wrote:
>> CC clock, ARM, DT, PM people
>>
>> TL;DR: Clocks may be in use by another CPU not running Linux, while Linux
>> disables them as being unused.
>
>> Of course this is not limited to clocks, but also to e.g. PM domains.
>
> BTW, how do you prevent Linux from powering down the CR7 PM domain,
> which contains the Cortex R7?
The idea is
--- a/drivers/soc/renesas/r8a7795-sysc.c
+++ b/drivers/soc/renesas/r8a7795-sysc.c
@@ -38,7 +38,8 @@ static const struct rcar_sysc_area r8a7795_areas[]
__initconst = {
{ "ca53-cpu3", 0x200, 3, R8A7795_PD_CA53_CPU3, R8A7795_PD_CA53_SCU,
PD_CPU_NOCR },
{ "a3vp", 0x340, 0, R8A7795_PD_A3VP, R8A7795_PD_ALWAYS_ON },
- { "cr7", 0x240, 0, R8A7795_PD_CR7, R8A7795_PD_ALWAYS_ON },
+ { "cr7", 0x240, 0, R8A7795_PD_CR7, R8A7795_PD_ALWAYS_ON,
+ PD_CPU_NOCR },
{ "a3vc", 0x380, 0, R8A7795_PD_A3VC, R8A7795_PD_ALWAYS_ON },
{ "a2vc0", 0x3c0, 0, R8A7795_PD_A2VC0, R8A7795_PD_A3VC },
{ "a2vc1", 0x3c0, 1, R8A7795_PD_A2VC1, R8A7795_PD_A3VC },
Not finally tested, though.
Best regards
Dirk
next prev parent reply other threads:[~2017-06-29 12:07 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-29 9:27 Clocks used by another OS/CPU (was: Re: [RFC PATCH] clk: renesas: cpg-mssr: Add interface for critical core clocks) Geert Uytterhoeven
2017-06-29 9:27 ` Geert Uytterhoeven
2017-06-29 10:28 ` Dirk Behme
2017-06-29 10:28 ` Dirk Behme
2017-06-29 11:18 ` Geert Uytterhoeven
2017-06-29 11:18 ` Geert Uytterhoeven
2017-06-29 13:18 ` Clocks used by another OS/CPU Dirk Behme
2017-06-29 13:18 ` Dirk Behme
2017-06-29 13:22 ` Geert Uytterhoeven
2017-06-29 13:22 ` Geert Uytterhoeven
[not found] ` <CAMuHMdW9+CNTTOVO4SRRUxuz3ajLbY2j1uG8b_RpHX52NPwXrQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-06-29 11:56 ` Clocks used by another OS/CPU (was: Re: [RFC PATCH] clk: renesas: cpg-mssr: Add interface for critical core clocks) Geert Uytterhoeven
2017-06-29 11:56 ` Geert Uytterhoeven
2017-06-29 11:56 ` Geert Uytterhoeven
2017-06-29 12:07 ` Dirk Behme [this message]
2017-06-29 12:07 ` Clocks used by another OS/CPU Dirk Behme
2017-06-29 12:45 ` Geert Uytterhoeven
2017-06-29 12:45 ` Geert Uytterhoeven
2017-06-29 12:55 ` Dirk Behme
2017-06-29 12:55 ` Dirk Behme
2017-06-30 8:02 ` Clocks used by another OS/CPU (was: Re: [RFC PATCH] clk: renesas: cpg-mssr: Add interface for critical core clocks) Peter De Schrijver
2017-06-30 8:02 ` Peter De Schrijver
2017-06-30 15:58 ` Rob Herring
2017-06-30 15:58 ` Rob Herring
2017-06-30 20:24 ` Uwe Kleine-König
2017-06-30 20:24 ` Uwe Kleine-König
2017-06-30 20:24 ` Uwe Kleine-König
[not found] ` <20170630202453.eh6vaehkap3as4np-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2017-07-01 5:02 ` Dirk Behme
2017-07-01 5:02 ` Dirk Behme
2017-07-01 5:02 ` Dirk Behme
2017-07-01 18:14 ` Uwe Kleine-König
2017-07-01 18:14 ` Uwe Kleine-König
2017-07-01 18:14 ` Uwe Kleine-König
2017-07-02 5:48 ` Dirk Behme
2017-07-02 5:48 ` Dirk Behme
[not found] ` <6098d579-f206-5a23-bbfc-ac13e0448479-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-07-02 9:23 ` Uwe Kleine-König
2017-07-02 9:23 ` Uwe Kleine-König
2017-07-02 9:23 ` Uwe Kleine-König
2017-07-02 9:23 ` Uwe Kleine-König
2017-07-03 7:40 ` Geert Uytterhoeven
2017-07-03 7:40 ` Geert Uytterhoeven
2017-07-03 7:40 ` Geert Uytterhoeven
[not found] ` <20170701181408.yuocymwtj5dgt74d-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2017-07-03 9:17 ` Sudeep Holla
2017-07-03 9:17 ` Sudeep Holla
2017-07-03 9:17 ` Sudeep Holla
2017-07-04 7:31 ` Peter De Schrijver
2017-07-04 7:31 ` Peter De Schrijver
2017-07-04 7:31 ` Peter De Schrijver
2017-07-04 7:31 ` Peter De Schrijver
2017-07-04 8:49 ` Sudeep Holla
2017-07-04 8:49 ` Sudeep Holla
2017-07-05 7:25 ` Peter De Schrijver
2017-07-05 7:25 ` Peter De Schrijver
2017-07-05 7:25 ` Peter De Schrijver
2017-07-05 7:25 ` Peter De Schrijver
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