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Date: Mon, 16 Nov 2015 14:38:44 +0100
From: Jacek Anaszewski <j.anaszewski@...sung.com>
To: Jacek Anaszewski <j.anaszewski@...sung.com>
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC v6 00/36] Remove work queues from LED class drivers
On 08/20/2015 04:43 PM, Jacek Anaszewski wrote:
> This is sixth version of the RFC aiming at removing work queues
> from LED class drivers, as well as getting rid of complimentary
> functionalities introduced along with addition of LED flash class
> extension.
>
> ======================
> Changes from version 5
> ======================
> - avoided changing semantics of brightness_set op in favour
> of introducing brightness_set_blocking op, which also allowed
> to get rid of LED_BRIGHTNESS_BLOCKING flag - Andrew thanks for
> the hints
> - made new brightness_set_blocking op returning int, which entailed
> the need for extending the scope of modifications in the drivers
> from which work queues are removed. Those affected drivers now
> implement the new op instead of brightness_set, which returns void
> - since LED_BRIGHTNESS_FAST flags is not needed with the new
> approach, its introduction has been postponed
>
> ======================
> Changes from version 4
> ======================
> - switched to using two separate ops for blocking and non-blocking way
> of setting brightness as requested by Pavel Machek.
> - improved patches for leds-lm3533, leds-regulator, leds-lp3944
> and leds-ipaq-micro drivers in response to review remarks
>
> ======================
> Changes from version 3
> ======================
> - fixed return value in one of intermediary patches
> - changed the comment over the brightness_set op member
> of struct led_classdev
> - added patches adjusting LED subsystem drivers to the introduced
> modifications - they have been only compile-tested
>
> ======================
> Changes from version 2
> ======================
>
> - split changes to several incremental patches
> - removed SET_BRIGHTNESS_SYNC and SET_BRIGHTNESS_ASYNC flags
> - fixed led_set_brightness_async function instead of renaming it
>
> ======================
> Changes from version 1
> ======================
>
> V2 includes also patches for one LED class driver
> and two LED flash class drivers, that show how the
> drivers will benefit from the optimization being
> introduced in the first patch of this patch set.
>
> I was able to test only the LED Flash class drivers.
>
> Original message from the patch 483a3122 ("leds: Use set_brightness_work for
> brightness_set ops that can sleep") that was sent previously as a single one:
>
> Hi All,
>
> Since this patch will affect all the LED subsystem drivers
> I'd like it was tested by as many developers as possible
> to make sure that I haven't missed something.
>
> For the drivers which can sleep in their brightness_set ops
> (e.g. use mutex or gpio "cansleep" API) you only need to
> remove the work queues and move the code executed currently
> in the work queue task to the brightness_set op, as now
> LED core does the job.
>
> For drivers that are capable of setting brightness with use
> of MMIO you need to set the LED_BRIGHTNESS_FAST flag, so
> that LED core would know that it doesn't have to employ
> work queue.
>
> After the patch is positively verified I will create relevant
> patches for every LED class driver.
>
> This patch is based on linux-next_20150622.
>
> I am looking forward to your cooperation.
>
> Best Regards,
> Jacek Anaszewski
>
> Andrew Lunn (23):
> leds: tlc591xx: Remove work queue
> leds: 88pm860x: Remove work queue
> leds: adp5520: Remove work queue
> leds: bd2802: Remove work queue
> leds: blinkm: Remove work queue
> leds: lm3533: Remove work queue
> leds: lm3642: Remove work queue
> leds: pca9532: Remove work queue for LEDs.
> leds: lp3944: Remove work queue
> leds: lp55xx: Remove work queue
> leds: lp8788: Remove work queue
> leds: lp8860: Remove work queue
> leds: pca955x: Remove work queue
> leds: pca963x: Remove work queue
> leds: wm831x: Remove work queue
> leds: da903x: Remove work queue
> leds: da9052: Remove work queue
> leds: dac124d085: Remove work queue
> leds: lt3593: Remove work queue
> leds: max8997: Remove unneeded workqueue include
> leds: mc13783: Remove work queue
> leds: regulator: Remove work queue
> leds: wm8350: Remove work queue
>
> Jacek Anaszewski (13):
> leds: Add brightness_set_blocking op
> leds: Add led_set_brightness_sync to the public LED subsystem API
> leds: Improve asynchronous path of setting brightness
> leds: Add an internal led_set_brightness_nosleep function
> leds: Improve setting brightness in a non sleeping way
> leds: Drivers shouldn't enforce SYNC/ASYNC brightness setting
> Documentation: leds: Add description of brightness_set* ops
> leds: ktd2692: Remove work queue
> leds: aat1290: Remove work queue
> leds: max77693: Remove work queue
> leds: gpio: Remove work queue
> leds: pwm: remove work queue
> leds: lm355x: Remove work queue
>
> Documentation/leds/leds-class.txt | 11 ++++
> drivers/leds/led-class-flash.c | 7 ---
> drivers/leds/led-class.c | 22 +++++---
> drivers/leds/led-core.c | 79 ++++++++++++++++++++------
> drivers/leds/leds-88pm860x.c | 23 +++-----
> drivers/leds/leds-aat1290.c | 50 +++++------------
> drivers/leds/leds-adp5520.c | 26 ++-------
> drivers/leds/leds-bd2802.c | 39 +++++--------
> drivers/leds/leds-blinkm.c | 87 ++++++-----------------------
> drivers/leds/leds-da903x.c | 46 ++++++---------
> drivers/leds/leds-da9052.c | 39 ++++---------
> drivers/leds/leds-dac124s085.c | 38 ++++---------
> drivers/leds/leds-gpio.c | 64 +++++++--------------
> drivers/leds/leds-ktd2692.c | 41 ++------------
> drivers/leds/leds-lm3533.c | 30 ++--------
> drivers/leds/leds-lm355x.c | 85 +++++++++-------------------
> drivers/leds/leds-lm3642.c | 73 ++++++++----------------
> drivers/leds/leds-lp3944.c | 32 +++--------
> drivers/leds/leds-lp5521.c | 11 ++--
> drivers/leds/leds-lp5523.c | 10 ++--
> drivers/leds/leds-lp5562.c | 11 ++--
> drivers/leds/leds-lp55xx-common.c | 12 ++--
> drivers/leds/leds-lp55xx-common.h | 6 +-
> drivers/leds/leds-lp8501.c | 11 ++--
> drivers/leds/leds-lp8788.c | 48 +++++++---------
> drivers/leds/leds-lp8860.c | 27 +++------
> drivers/leds/leds-lt3593.c | 33 ++++-------
> drivers/leds/leds-max77693.c | 57 +++----------------
> drivers/leds/leds-max8997.c | 1 -
> drivers/leds/leds-mc13783.c | 35 +++---------
> drivers/leds/leds-pca9532.c | 28 ++++------
> drivers/leds/leds-pca955x.c | 39 +++----------
> drivers/leds/leds-pca963x.c | 80 ++++++++------------------
> drivers/leds/leds-pwm.c | 34 +++++------
> drivers/leds/leds-regulator.c | 46 ++++-----------
> drivers/leds/leds-tlc591xx.c | 31 +++-------
> drivers/leds/leds-wm831x-status.c | 25 +++------
> drivers/leds/leds-wm8350.c | 64 +++++++++------------
> drivers/leds/leds.h | 26 +++------
> drivers/leds/trigger/ledtrig-backlight.c | 8 +--
> drivers/leds/trigger/ledtrig-default-on.c | 2 +-
> drivers/leds/trigger/ledtrig-gpio.c | 6 +-
> drivers/leds/trigger/ledtrig-heartbeat.c | 4 +-
> drivers/leds/trigger/ledtrig-oneshot.c | 4 +-
> drivers/leds/trigger/ledtrig-transient.c | 8 +--
> include/linux/leds.h | 31 +++++++---
> include/linux/mfd/wm8350/pmic.h | 1 -
> 47 files changed, 512 insertions(+), 979 deletions(-)
>
Applied patches 11-36 from this set.
--
Best Regards,
Jacek Anaszewski
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