linux-kernel - Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver

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Message-ID: <54DD7ECC.5020504@codeaurora.org>
Date:	Thu, 12 Feb 2015 20:34:20 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...aro.org>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] leds: add Qualcomm PM8941 WLED driver

On 02/12/15 20:28, Ivan T. Ivanov wrote:
> On Thu, 2015-02-12 at 20:07 -0800, Stephen Boyd wrote:
>> On 01/29/15 04:48, Ivan T. Ivanov wrote:
>>> Otherwise it looks good. Driver is loaded and device is detected
>>> properly (i have added readings for type and subtype registers).
>>> Do you know where I can measure result from changing brightness
>>> sysfs entry. I am using 8074 dragonboard?
>> Does the backlight turn on? From what I can tell it controls the
>> backlight, but it may be that nothings getting displayed so it won't be
>> noticeable.
>>
> Yes, I can not see visual changes. That is why I have asked where
> I could hook the probe and measure current change or wherever.
> BL_WLEDx signals go out from J2, but somehow I was unable to 
> locate it on the board, will try to look harder :-)
>
>

When the screen is "off" in android I can still turn on the brightness
to max in sysfs and see the screen glow. Hopefully we don't need
something else to make that work.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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