From: Frank Wunderlich <frank-w@public-files.de>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Frank Wunderlich <linux@fw-web.de>
Cc: linux-pm@vger.kernel.org, "Rafael J. Wysocki" <rafael@kernel.org>,
Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
Stephen Boyd <sboyd@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC v1] opp: add config option for debug
Date: Thu, 05 May 2022 19:50:56 +0200 [thread overview]
Message-ID: <E08A9747-2F96-42A7-A427-0E00D4075CF0@public-files.de> (raw)
In-Reply-To: <YnLEwEIOqnLGxFjJ@kroah.com>
Hi,
Am 4. Mai 2022 20:24:00 MESZ schrieb Greg Kroah-Hartman <gregkh@linuxfoundation.org>:
>On Wed, May 04, 2022 at 07:48:23PM +0200, Frank Wunderlich wrote:
>> From: Frank Wunderlich <frank-w@public-files.de>
>>
>> Currently OPP debug is enabled by DEBUG_DRIVER option. This is
>generic
>> driver debug and opp floods serial console. This is annoying if opp
>is
>> not needed so give it an additional config-key.
>>
>> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
>> ---
>> drivers/base/Kconfig | 1 +
>> drivers/opp/Kconfig | 7 +++++++
>> drivers/opp/Makefile | 2 +-
>> 3 files changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
>> index 6f04b831a5c0..8ae826c95d5f 100644
>> --- a/drivers/base/Kconfig
>> +++ b/drivers/base/Kconfig
>> @@ -130,6 +130,7 @@ config DEV_COREDUMP
>> config DEBUG_DRIVER
>> bool "Driver Core verbose debug messages"
>> depends on DEBUG_KERNEL
>> + imply DEBUG_OPP
>
>This should not be needed, otherwise we would have to do that for all
>random driver subsystem in the kernel.
Have added this to have same behaviour if anyone sets DEBUG_DRIVER via defconfig. Else this is disabled by default.
>> help
>> Say Y here if you want the Driver core to produce a bunch of
>> debug messages to the system log. Select this if you are having a
>> diff --git a/drivers/opp/Kconfig b/drivers/opp/Kconfig
>> index e8ce47b32735..6a2d2c6c1143 100644
>> --- a/drivers/opp/Kconfig
>> +++ b/drivers/opp/Kconfig
>> @@ -12,3 +12,10 @@ config PM_OPP
>> representing individual voltage domains and provides SOC
>> implementations a ready to use framework to manage OPPs.
>> For more information, read <file:Documentation/power/opp.rst>
>> +
>> +menu "Operating Performance Points (OPP)"
>> +config DEBUG_OPP
>> + bool "Debug Operating Performance Points"
>> + help
>> + enable opp debugging
>> +endmenu
>> diff --git a/drivers/opp/Makefile b/drivers/opp/Makefile
>> index f65ed5985bb4..2589915eef95 100644
>> --- a/drivers/opp/Makefile
>> +++ b/drivers/opp/Makefile
>> @@ -1,5 +1,5 @@
>> # SPDX-License-Identifier: GPL-2.0-only
>> -ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
>> +ccflags-$(CONFIG_DEBUG_OPP) := -DDEBUG
>
>This feels wrong, you shouldn't need a -DDEBUG for anything if all is
>going correctly. Why is opp so odd this way? Just use the normal
>dev_dbg() macros and all will be fine, nothing special should be needed
>at all.
I have looked more into it,just wanted to get driver debug (probing/binding) and dev_dbg messages without the opp spam (floods serial console).
>And don't use a config option for it either, no one will turn it on, it
>needs to "just work" for all systems.
Config option is to enable if needed and not via driver-debug.
>thanks,
>
>greg k-h
regards Frank
next prev parent reply other threads:[~2022-05-05 17:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-04 17:48 [RFC v1] opp: add config option for debug Frank Wunderlich
2022-05-04 18:24 ` Greg Kroah-Hartman
2022-05-05 17:50 ` Frank Wunderlich [this message]
2022-05-05 17:57 ` Greg Kroah-Hartman
2022-05-05 5:58 ` Viresh Kumar
2022-05-05 15:54 ` Aw: " Frank Wunderlich
2022-05-05 17:38 ` Greg Kroah-Hartman
2022-05-06 4:06 ` Viresh Kumar
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