linux-kernel - [PATCH v4 5/8] drm/panel: panel-simple: Implement .get

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Date:   Mon,  6 Jun 2022 23:24:28 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        Rob Clark <robdclark@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/8] drm/panel: panel-simple: Implement .get_orientation callback

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
---
 drivers/gpu/drm/panel/panel-simple.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 4a2e580a2f7b..f232b8cf4075 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -411,7 +411,12 @@ static int panel_simple_get_modes(struct drm_panel *panel,
 	/* add hard-coded panel modes */
 	num += panel_simple_get_non_edid_modes(p, connector);
 
-	/* set up connector's "panel orientation" property */
+	/*
+	 * drm drivers are expected to call drm_panel_get_orientation() to get
+	 * panel's orientation then drm_connector_set_panel_orientation() to
+	 * set the property before drm_dev_register(). Otherwise there will be
+	 * a WARN_ON if orientation is set after drm is registered.
+	 */
 	drm_connector_set_panel_orientation(connector, p->orientation);
 
 	return num;
@@ -434,6 +439,14 @@ static int panel_simple_get_timings(struct drm_panel *panel,
 	return p->desc->num_timings;
 }
 
+static enum drm_panel_orientation panel_simple_get_orientation(struct drm_panel *panel)
+{
+       struct panel_simple *p = to_panel_simple(panel);
+
+       return p->orientation;
+}
+
+
 static const struct drm_panel_funcs panel_simple_funcs = {
 	.disable = panel_simple_disable,
 	.unprepare = panel_simple_unprepare,
@@ -441,6 +454,7 @@ static const struct drm_panel_funcs panel_simple_funcs = {
 	.enable = panel_simple_enable,
 	.get_modes = panel_simple_get_modes,
 	.get_timings = panel_simple_get_timings,
+	.get_orientation = panel_simple_get_orientation,
 };
 
 static struct panel_desc panel_dpi;
-- 
2.36.1.255.ge46751e96f-goog