linux-kernel - [PATCH v5 02/11] drm/bridge: dw-hdmi: add max bpc connector property

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Date:   Wed,  4 Mar 2020 11:40:43 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     p.zabel@...gutronix.de, heiko@...ech.de, a.hajda@...sung.com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, boris.brezillon@...labora.com
Cc:     linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCH v5 02/11] drm/bridge: dw-hdmi: add max bpc connector property

From: Jonas Karlman <jonas@...boo.se>

Add the max_bpc property to the dw-hdmi connector to prepare support
for 10, 12 & 16bit output support.

Signed-off-by: Jonas Karlman <jonas@...boo.se>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Reviewed-by: Jernej Škrabec <jernej.skrabec@...l.net>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 10f98c9ee77e..e097f60e6431 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2414,6 +2414,14 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge,
 				    DRM_MODE_CONNECTOR_HDMIA,
 				    hdmi->ddc);
 
+	/*
+	 * drm_connector_attach_max_bpc_property() requires the
+	 * connector to have a state.
+	 */
+	drm_atomic_helper_connector_reset(connector);
+
+	drm_connector_attach_max_bpc_property(connector, 8, 16);
+
 	if (hdmi->version >= 0x200a && hdmi->plat_data->use_drm_infoframe)
 		drm_object_attach_property(&connector->base,
 			connector->dev->mode_config.hdr_output_metadata_property, 0);
-- 
2.22.0