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

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Message-ID: <YYOZ4TI29Oq6i6za@google.com>
Date:   Thu, 4 Nov 2021 08:29:21 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        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

On Wed, 03 Nov 2021, 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).

Also the merge-window is open, so this is headed for v5.17.

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