linux-kernel - Re: [PATCH] backlight: apple_bl: Use acpi_video_get_backlight

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Date:   Mon, 13 Mar 2023 13:15:49 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...nel.org>, Lee Jones <lee@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Aditya Garg <gargaditya08@...e.com>,
        platform-driver-x86@...r.kernel.org,
        Matthew Garrett <mjg59@...f.ucam.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] backlight: apple_bl: Use acpi_video_get_backlight_type()

Hi,

On 3/9/23 18:09, Daniel Thompson wrote:
> On Tue, Mar 07, 2023 at 01:05:40PM +0100, Hans de Goede wrote:
>> On some MacBooks both the apple_bl and the apple-gmux backlight drivers
>> may be able to export a /sys/class/backlight device.
>>
>> To avoid having 2 backlight devices for one LCD panel until now
>> the apple-gmux driver has been calling apple_bl_unregister() to move
>> the apple_bl backlight device out of the way when it loads.
>>
>> Similar problems exist on other x86 laptops and all backlight drivers
>> which may be used on x86 laptops have moved to using
>> acpi_video_get_backlight_type() to determine whether they should load
>> or not.
>>
>> Switch apple_bl to this model too, so that it is consistent with all
>> the other x86 backlight drivers.
>> [snip]
>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> 
> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> 
> but...

Thank you.

>> ---
>> A note to the backlight class / subsystem maintainers, this change
>> applies on top of a similar patch for drivers/platform/x86/apple-gmux.c
>> which makes that driver use acpi_video_get_backlight_type(). See:
>> https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans
>>
>> I believe it is easiest to also merge this patch through
>> the platform-drivers-x86 tree, may I please have your Ack for this ?
>> ---
> 
> ... please don't treat above as an ack. Lee Jones will hopefully be
> along shortly to discuss that!

Understood.

Regards,

Hans