linux-kernel - Re: [PATCH] drm/dp: Move panel DP AUX backlight support to drm_dp

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Date:   Mon, 12 Jul 2021 08:06:10 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Rajeev Nandan <rajeevny@...eaurora.org>
Cc:     Lyude Paul <lyude@...hat.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Robert Foss <robert.foss@...aro.org>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/dp: Move panel DP AUX backlight support to drm_dp_helper

Hi,

On Sat, Jul 10, 2021 at 3:29 AM <rajeevny@...eaurora.org> wrote:
>
> > @@ -209,18 +208,11 @@ static inline int
> > of_drm_get_panel_orientation(const struct device_node *np,
> >  #if IS_ENABLED(CONFIG_DRM_PANEL) &&
> > (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
> >       (IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
>
> Thanks, for the fix. Changes look good to me. I checked this on Trogdor
> Lazor device.
>
> I have one small doubt, shouldn't we add above (or similar) check around
> drm_panel_dp_aux_backlight() in drm_dp_helper source & header files?
> This function is using devm_backlight_device_register() that needs
> CONFIG_BACKLIGHT_CLASS_DEVICE for compilation.
>
> If that's not an issue,
> Reviewed-by: Rajeev Nandan <rajeevny@...eaurora.org>

Indeed you are correct. I tried trying off the
CONFIG_BACKLIGHT_CLASS_DEVICE and it was unhappy. I've posted a v2
which I think fixes this [1]. I left your review tag off to give you a
chance to confirm I didn't goof anything else up in the v2. Thanks!

[1] https://lore.kernel.org/lkml/20210712075933.v2.1.I23eb4cc5a680341e7b3e791632a635566fa5806a@changeid/

-Doug