linux-kernel - Re: [PATCH v3 1/5] leds: lm3532: Fix brightness control for i2c mode

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Date:   Tue, 27 Aug 2019 07:03:34 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>
CC:     <jacek.anaszewski@...il.com>, <sre@...nel.org>,
        <nekit1000@...il.com>, <mpartap@....net>, <merlijn@...zup.org>,
        <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] leds: lm3532: Fix brightness control for i2c mode

Tony

On 8/26/19 5:44 PM, Tony Lindgren wrote:
> * Pavel Machek <pavel@....cz> [190826 22:14]:
>> On Mon 2019-08-26 14:58:22, Tony Lindgren wrote:
>>> Hi,
>>>
>>> * Dan Murphy <dmurphy@...com> [190820 19:53]:
>>>> Fix the brightness control for I2C mode.  Instead of
>>>> changing the full scale current register update the ALS target
>>>> register for the appropriate banks.
>>>>
>>>> In addition clean up some code errors and random misspellings found
>>>> during coding.
>>>>
>>>> Tested on Droid4 as well as LM3532 EVM connected to a BeagleBoneBlack
>>>>
>>>> Fixes: e37a7f8d77e1 ("leds: lm3532: Introduce the lm3532 LED driver")
>>>> Reported-by: Pavel Machek <pavel@....cz>
>>>> Signed-off-by: Dan Murphy <dmurphy@...com>
>>>> ---
>>>>
>>>> v3 - Removed register define updates - https://lore.kernel.org/patchwork/patch/1114542/
>>> Looks like starting with this patch in Linux next the LCD on droid4
>>> is so dim it's unreadable even with brightness set to 255. Setting
>>> brightness to 0 does blank it completely though.
>>>
>>> Did something maybe break with the various patch revisions or are
>>> we now missing some dts patch?
>> Maybe missing dts patch. We should provide maximum current the LED can
>> handle...
> Or i2c control is somehow broken and only als control now works?

Let me test the next branch.

I did not see this when I wrote the patches on the Droid 4.

But I did not recheck Droid 4.

Dan



> Regards,
>
> Tony
>