linux-kernel - [PATCH v8 6/6] drm/bridge: cadence: cdns-mhdp8546-core: Handle HDCP state in bridge atomic check

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Message-ID: <20251014094527.3916421-7-h-shenoy@ti.com>
Date: Tue, 14 Oct 2025 15:15:27 +0530
From: Harikrishna Shenoy <h-shenoy@...com>
To: <Laurent.pinchart@...asonboard.com>, <airlied@...il.com>,
        <andrzej.hajda@...el.com>, <andy.yan@...k-chips.com>,
        <aradhya.bhatia@...ux.dev>, <devarsht@...com>, <dianders@...omium.org>,
        <dri-devel@...ts.freedesktop.org>, <javierm@...hat.com>,
        <jernej.skrabec@...il.com>, <jonas@...boo.se>,
        <linux-kernel@...r.kernel.org>, <linux@...blig.org>,
        <luca.ceresoli@...tlin.com>, <lumag@...nel.org>, <lyude@...hat.com>,
        <maarten.lankhorst@...ux.intel.com>, <mordan@...ras.ru>,
        <mripard@...nel.org>, <neil.armstrong@...aro.org>, <rfoss@...nel.org>,
        <s-jain1@...com>, <simona@...ll.ch>, <tomi.valkeinen@...asonboard.com>,
        <tzimmermann@...e.de>, <u-kumar1@...com>
Subject: [PATCH v8 6/6] drm/bridge: cadence: cdns-mhdp8546-core: Handle HDCP state in bridge atomic check

Now that we have DBANC framework and legacy connector functions removed,
handle the HDCP disabling in bridge atomic check rather than in connector
atomic check in !(DBANC) usecase.

Signed-off-by: Harikrishna Shenoy <h-shenoy@...com>
---
 .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 06ac5c2ee78f..120eb7ffe20c 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1962,6 +1962,10 @@ static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
 {
 	struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
 	const struct drm_display_mode *mode = &crtc_state->adjusted_mode;
+	struct drm_connector_state *old_state, *new_state;
+	struct drm_atomic_state *state = crtc_state->state;
+	struct drm_connector *conn = mhdp->connector;
+	u64 old_cp, new_cp;
 
 	mutex_lock(&mhdp->link_mutex);
 
@@ -1981,6 +1985,25 @@ static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
 	if (mhdp->info)
 		bridge_state->input_bus_cfg.flags = *mhdp->info->input_bus_flags;
 
+	if (conn && mhdp->hdcp_supported) {
+		old_state = drm_atomic_get_old_connector_state(state, conn);
+		new_state = drm_atomic_get_new_connector_state(state, conn);
+		old_cp = old_state->content_protection;
+		new_cp = new_state->content_protection;
+
+		if (old_state->hdcp_content_type != new_state->hdcp_content_type &&
+		    new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
+			new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+			crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
+			crtc_state->mode_changed = true;
+		}
+
+		if (!new_state->crtc) {
+			if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
+				new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+		}
+	}
+
 	mutex_unlock(&mhdp->link_mutex);
 	return 0;
 }
-- 
2.34.1