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

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Message-ID: <20211103173107.xlchsysme5xzpn24@maple.lan>
Date:   Wed, 3 Nov 2021 17:31:07 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
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

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).


Daniel.