[PATCH v8 2/4] drm/panel: set display info in panel attach

[Derek Basehore <dbasehore@chromium.org>]

Devicetree systems can set panel orientation via a panel binding, but
there's no way, as is, to propagate this setting to the connector,
where the property need to be added.
To address this, this patch sets orientation, as well as other fixed
values for the panel, in the drm_panel_attach function. These values
are stored from probe in the drm_panel struct.

Signed-off-by: Derek Basehore <dbasehore@chromium.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/gpu/drm/drm_panel.c | 28 +++++++++++++++++++++
 include/drm/drm_panel.h     | 50 +++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 0909b53b74e6..1cd2b56c9fe6 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -104,11 +104,23 @@ EXPORT_SYMBOL(drm_panel_remove);
  */
 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector)
 {
+	struct drm_display_info *info;
+
 	if (panel->connector)
 		return -EBUSY;
 
 	panel->connector = connector;
 	panel->drm = connector->dev;
+	info = &connector->display_info;
+	info->width_mm = panel->width_mm;
+	info->height_mm = panel->height_mm;
+	info->bpc = panel->bpc;
+	info->panel_orientation = panel->orientation;
+	info->bus_flags = panel->bus_flags;
+	if (panel->bus_formats)
+		drm_display_info_set_bus_formats(&connector->display_info,
+						 panel->bus_formats,
+						 panel->num_bus_formats);
 
 	return 0;
 }
@@ -126,6 +138,22 @@ EXPORT_SYMBOL(drm_panel_attach);
  */
 void drm_panel_detach(struct drm_panel *panel)
 {
+	struct drm_display_info *info;
+
+	if (!panel->connector)
+		goto out;
+
+	info = &panel->connector->display_info;
+	info->width_mm = 0;
+	info->height_mm = 0;
+	info->bpc = 0;
+	info->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+	info->bus_flags = 0;
+	kfree(info->bus_formats);
+	info->bus_formats = NULL;
+	info->num_bus_formats = 0;
+
+out:
 	panel->connector = NULL;
 	panel->drm = NULL;
 }
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index d16158deacdc..f3587a54b8ac 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -141,6 +141,56 @@ struct drm_panel {
 	 */
 	const struct drm_panel_funcs *funcs;
 
+	/**
+	 * @width_mm:
+	 *
+	 * Physical width in mm.
+	 */
+	unsigned int width_mm;
+
+	/**
+	 * @height_mm:
+	 *
+	 * Physical height in mm.
+	 */
+	unsigned int height_mm;
+
+	/**
+	 * @bpc:
+	 *
+	 * Maximum bits per color channel. Used by HDMI and DP outputs.
+	 */
+	unsigned int bpc;
+
+	/**
+	 * @orientation
+	 *
+	 * Installation orientation of the panel with respect to the chassis.
+	 */
+	int orientation;
+
+	/**
+	 * @bus_formats
+	 *
+	 * Pixel data format on the wire.
+	 */
+	const u32 *bus_formats;
+
+	/**
+	 * @num_bus_formats:
+	 *
+	 * Number of elements pointed to by @bus_formats
+	 */
+	unsigned int num_bus_formats;
+
+	/**
+	 * @bus_flags:
+	 *
+	 * Additional information (like pixel signal polarity) for the pixel
+	 * data on the bus.
+	 */
+	u32 bus_flags;
+
 	/**
 	 * @list:
 	 *
-- 
2.23.0.351.gc4317032e6-goog