linux-kernel - Re: [PATCH 05/10] drm/panel: Create attach and detach callbacks

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Date:   Thu, 22 Jul 2021 13:23:53 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Robert Foss <robert.foss@...aro.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 05/10] drm/panel: Create attach and detach callbacks

Hi Maxime,

On Tue, Jul 20, 2021 at 7:15 PM Maxime Ripard <maxime@...no.tech> wrote:
>
> In order to make the probe order expectation more consistent between
> bridges, let's create attach and detach hooks for the panels as well to
> match what is there for bridges.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  drivers/gpu/drm/drm_panel.c | 20 ++++++++++++++++++++
>  include/drm/drm_panel.h     |  6 ++++++
>  2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index f634371c717a..23bca798a2f3 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -223,6 +223,26 @@ int drm_panel_get_modes(struct drm_panel *panel,
>  }
>  EXPORT_SYMBOL(drm_panel_get_modes);
>
> +int drm_panel_attach(struct drm_panel *panel)
> +{
> +       if (!panel)
> +               return -EINVAL;
> +
> +       if (panel->funcs && panel->funcs->attach)
> +               return panel->funcs->attach(panel);
> +
> +       return -EOPNOTSUPP;

Most of the panel drivers won't require panel attach/detach API's so
we need to handle those cases as well if we didn't already.

Thanks,
Jagan.