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From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: linux-input@vger.kernel.org, David Lin <dtwlin@google.com>,
	corbet@lwn.net, rpurdie@rpsys.net, hdegoede@redhat.com,
	gregkh@linuxfoundation.org, robh@kernel.org, romlem@google.com,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-leds@vger.kernel.org
Subject: Re: Vibrations in input vs. LED was Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer
Date: Sun, 17 Sep 2017 18:41:33 +0200	[thread overview]
Message-ID: <9afbd987-b237-24d4-e16a-ddd7fa70766a@gmail.com> (raw)
In-Reply-To: <20170916015809.GA5072@localhost>

Hi,

On 09/16/2017 03:58 AM, Pavel Machek wrote:
> Hi!
> 
>>>>>> These patch series add the LED_BRIGHTNESS_FAST flag support for
>>>>>> ledtrig-transient to use hrtimer so that platforms with high-resolution timer
>>>>>> support can have better accuracy in the trigger duration timing. The need for
> ...
>>> If we want to say "lets move all vibrations from input to LED
>>> subsystem"... I don't think that is good idea, but its a valid
>>> discussion. Some good reasons would be needed.
>>>
>>> But having half devices use one interface and half use different one
>>> is just bad... especially when only reason to do it that way is
>>> "David wants to do it that way, android library made a mistake and he
>>> now wants it to propagate to whole world".
>>
>> This is not the only reason. Adding hr_timer support to
>> ledtrig-transient (and similarly to ledtrig-timer) would allow
>> to increase the accuracy and stability of delay_on/delay_off
>> intervals at low values.
>>
>> Do you think such an improvement could be harmful in some way,
>> even if it was made optional?
> 
> Of course, we can make LED timing accurate down to microseconds. It will
> mean increased overhead -- for "improvement" human can not perceive.
> 
> If someone has problems with LED delays not being accurate enough... we
> may want to fix it. But that is not the case here, is it?

AFAIR David was mentioning that the hr_timer support is perceivable

-- 
Best regards,
Jacek Anaszewski

  reply	other threads:[~2017-09-17 16:42 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-13 17:53 [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer David Lin
2017-09-13 17:53 ` [PATCH v2 1/3] leds: Replace flags bit shift with BIT() macros David Lin
2017-09-14 19:43   ` Jacek Anaszewski
2017-09-13 17:53 ` [PATCH v2 2/3] leds: Add the LED_BRIGHTNESS_FAST flag David Lin
2017-09-13 17:54 ` [PATCH v2 3/3] led: ledtrig-transient: add support for hrtimer David Lin
2017-09-13 20:20 ` [PATCH v2 0/3] " Pavel Machek
2017-09-13 21:20   ` David Lin
2017-09-13 21:34     ` Pavel Machek
2017-09-14 17:31       ` David Lin
2017-09-14 19:42         ` Pavel Machek
2017-09-14 19:31   ` Jacek Anaszewski
2017-09-14 19:38     ` David Lin
2017-09-14 20:03       ` Jacek Anaszewski
2017-09-14 20:58     ` Vibrations in input vs. LED was " Pavel Machek
2017-09-15 18:34       ` Dmitry Torokhov
2017-09-15 21:55         ` Jacek Anaszewski
2017-09-15 22:30           ` Dmitry Torokhov
2017-09-17 16:41             ` Jacek Anaszewski
2017-09-17 18:22               ` Pavel Machek
2017-09-17 21:15                 ` Pavel Machek
2017-09-18 20:50                 ` Jacek Anaszewski
2017-09-18 22:29                   ` Dmitry Torokhov
2017-09-19 20:45                     ` Jacek Anaszewski
2017-09-19 21:07                       ` Dmitry Torokhov
2017-09-20 19:31                         ` Jacek Anaszewski
2017-09-20 11:29                       ` Pavel Machek
2017-09-20 20:08                         ` Jacek Anaszewski
2017-10-06 11:48                           ` Pavel Machek
2017-10-06 20:57                             ` Jacek Anaszewski
2017-09-20 11:26                   ` Pavel Machek
2017-09-28  5:03             ` David Lin
2017-09-28  5:43               ` Dmitry Torokhov
2017-09-28 19:22                 ` David Lin
2017-10-05  0:40                   ` Dmitry Torokhov
2017-09-16 12:59           ` Pavel Machek
2017-09-15 21:55       ` Jacek Anaszewski
2017-09-16  1:58         ` Pavel Machek
2017-09-17 16:41           ` Jacek Anaszewski [this message]
2017-09-17 17:50             ` Pavel Machek
2017-09-18 20:43               ` Jacek Anaszewski
2017-09-20 11:15                 ` Pavel Machek
2017-09-20 18:44                   ` Jacek Anaszewski

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