linux-kernel - Re: [PATCH v2 3/3] backlight: lp855x: Add support ACPI enumeration

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Date:   Wed, 3 Nov 2021 18:34:56 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Tsuchiya Yuto <kitakar@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] backlight: lp855x: Add support ACPI enumeration

Hi,

On 11/3/21 18:31, Daniel Thompson wrote:
> On Wed, Nov 03, 2021 at 06:28:15PM +0100, Hans de Goede wrote:
>> Hi,
>>
>> On 11/3/21 18:17, Daniel Thompson wrote:
>>> On Tue, Nov 02, 2021 at 11:55:04PM +0100, Hans de Goede wrote:
>>>> The Xiaomi Mi Pad 2 tablet uses an ACPI enumerated LP8556 backlight
>>>> controller for its LCD-panel, with a Xiaomi specific ACPI HID of
>>>> "XMCC0001", add support for this.
>>>>
>>>> Note the new "if (id)" check also fixes a NULL pointer deref when a user
>>>> tries to manually bind the driver from sysfs.
>>>>
>>>> When CONFIG_ACPI is disabled acpi_match_device() will always return NULL,
>>>> so the lp855x_parse_acpi() call will get optimized away.
>>>>
>>>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>>>
>>> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
>>
>> Thank you.
>>
>> So what is the process for upstreaming backlight patches,
>> do these go through drm-misc-next (in that case I can push
>> the series myself), or will you pick these up ?
> 
> Lee Jones gathers up the backlight patches and sends a PR (but, except
> in exceptional cases, treats my R-b as a pre-requisite before doing so).

Ok, thanks.

Regards,

Hans