On 30.10.2022 15:20, Pavel Machek wrote: > On Sun 2022-10-30 06:07:05, Arseniy Krasnov wrote: >> This allows to set own workqueue for each LED. This may be useful, because >> default 'system_wq' does not guarantee execution order of each work_struct, >> thus for several brightness update requests (for multiple leds), real >> brightness switch could be in random order. > > So.. what? > > Even if execution order is switched, human eye will not be able to > tell the difference. Hello, Problem arises on one of our boards where we have 14 triples of leds(each triple contains R G B). Test case is to play complex animation on all leds: smooth switch from on RGB state to another. Sometimes there are glitches in this process - divergence from expectable RGB state. We fixed this by using ordered workqueue. Thanks, Arseniy > Pavel
