linux-kernel - [PATCH] drm/bridge: it6505: handle HDCP request

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Message-Id: <20221101112009.1067681-1-hsinyi@chromium.org>
Date:   Tue,  1 Nov 2022 19:20:10 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Robert Foss <robert.foss@...aro.org>,
        Allen Chen <allen.chen@....com.tw>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Pin-yen Lin <treapking@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hermes Wu <hermes.wu@....com.tw>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/bridge: it6505: handle HDCP request

it6505 supports HDCP 1.3, but current implementation lacks the update of
HDCP status through drm_hdcp_update_content_protection(). it6505 default
enables the HDCP. If user set it to undesired then the driver will stop
HDCP.

Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 54 +++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index b929fc766e243..65c6f932cae25 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -423,6 +423,7 @@ struct it6505 {
 	struct extcon_dev *extcon;
 	struct work_struct extcon_wq;
 	int extcon_state;
+	struct drm_connector *connector;
 	enum drm_connector_status connector_status;
 	enum link_train_status link_state;
 	struct work_struct link_works;
@@ -2399,6 +2400,14 @@ static void it6505_irq_hdcp_done(struct it6505 *it6505)
 
 	DRM_DEV_DEBUG_DRIVER(dev, "hdcp done interrupt");
 	it6505->hdcp_status = HDCP_AUTH_DONE;
+	if (it6505->connector) {
+		struct drm_device *drm_dev = it6505->connector->dev;
+
+		drm_modeset_lock(&drm_dev->mode_config.connection_mutex, NULL);
+		drm_hdcp_update_content_protection(it6505->connector,
+						   DRM_MODE_CONTENT_PROTECTION_ENABLED);
+		drm_modeset_unlock(&drm_dev->mode_config.connection_mutex);
+	}
 	it6505_show_hdcp_info(it6505);
 }
 
@@ -2931,6 +2940,7 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
 	if (WARN_ON(!connector))
 		return;
 
+	it6505->connector = connector;
 	conn_state = drm_atomic_get_new_connector_state(state, connector);
 
 	if (WARN_ON(!conn_state))
@@ -2974,6 +2984,7 @@ static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
 
 	DRM_DEV_DEBUG_DRIVER(dev, "start");
 
+	it6505->connector = NULL;
 	if (it6505->powered) {
 		it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
 					     DP_SET_POWER_D3);
@@ -3028,6 +3039,48 @@ static struct edid *it6505_bridge_get_edid(struct drm_bridge *bridge,
 	return edid;
 }
 
+static int it6505_connector_atomic_check(struct it6505 *it6505,
+					 struct drm_connector_state *state)
+{
+	struct device *dev = &it6505->client->dev;
+	int cp = state->content_protection;
+
+	DRM_DEV_DEBUG_DRIVER(dev, "hdcp connector state:%d, curr hdcp state:%d",
+			     cp, it6505->hdcp_status);
+
+	if (!it6505->hdcp_desired) {
+		DRM_DEV_DEBUG_DRIVER(dev, "sink not support hdcp");
+		return 0;
+	}
+
+	if (it6505->hdcp_status == HDCP_AUTH_GOING)
+		return -EINVAL;
+
+	if (cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
+		if (it6505->hdcp_status == HDCP_AUTH_DONE)
+			it6505_stop_hdcp(it6505);
+	} else if (cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
+		if (it6505->hdcp_status == HDCP_AUTH_IDLE &&
+		    it6505->link_state == LINK_OK)
+			it6505_start_hdcp(it6505);
+	} else {
+		DRM_DEV_DEBUG_DRIVER(dev, "invalid to set hdcp enabled");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int it6505_bridge_atomic_check(struct drm_bridge *bridge,
+				      struct drm_bridge_state *bridge_state,
+				      struct drm_crtc_state *crtc_state,
+				      struct drm_connector_state *conn_state)
+{
+	struct it6505 *it6505 = bridge_to_it6505(bridge);
+
+	return it6505_connector_atomic_check(it6505, conn_state);
+}
+
 static const struct drm_bridge_funcs it6505_bridge_funcs = {
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -3035,6 +3088,7 @@ static const struct drm_bridge_funcs it6505_bridge_funcs = {
 	.attach = it6505_bridge_attach,
 	.detach = it6505_bridge_detach,
 	.mode_valid = it6505_bridge_mode_valid,
+	.atomic_check = it6505_bridge_atomic_check,
 	.atomic_enable = it6505_bridge_atomic_enable,
 	.atomic_disable = it6505_bridge_atomic_disable,
 	.atomic_pre_enable = it6505_bridge_atomic_pre_enable,
-- 
2.38.0.135.g90850a2211-goog