linux-kernel - Re: LED backlight on Droid 4 and others

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Message-ID: <20200218135219.GC3494@dell>
Date:   Tue, 18 Feb 2020 13:52:19 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Tony Lindgren <tony@...mide.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, sre@...nel.org, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org, martin_rysavy@...trum.cz,
        agx@...xcpu.org, daniel.thompson@...aro.org, jingoohan1@...il.com,
        dri-devel@...ts.freedesktop.org, tomi.valkeinen@...com,
        jjhiblot@...com
Subject: Re: LED backlight on Droid 4 and others

On Wed, 12 Feb 2020, Pavel Machek wrote:

> Hi!
> 
> > > > It would be good to get LED backlight to work in clean way for 5.6
> > > > kernel.
> > ...
> > > > [If you have an idea what else is needed, it would be welcome; it
> > > > works for me in development tree but not in tree I'd like to
> > > > upstream.]
> > > > 
> > > > Lee, would you be willing to take "backlight: add led-backlight
> > > > driver"? Would it help if I got "leds: Add managed API to get a LED
> > > > from a device driver" and "leds: Add of_led_get() and led_put()" into
> > > > for_next tree of the LED subsystem?
> > > 
> > > It looks like you have an open question from Tony on v10.
> > > 
> > > Is that patch orthogonal, or are there depend{ants,encies}?
> > 
> > Uhh looks like we messed up a bit with integration. Now droid4
> > LCD backlight can no longer be enabled at all manually in v5.6-rc1
> > without the "add led-backlight driver" patch.. Should we just
> > merge it to fix it rather than start scrambling with other
> > temporary hacks?
> 
> We should just merge the "add led-backlight driver". Everything should
> be ready for it. I'm sorry if I broke something working, I was not
> aware it worked at all.
> 
> Unfortunately, this is backlight code, not LED, so I can't just merge it.

Please go ahead.  Apply my Acked-by and merge away ASAP.

Acked-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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