linux-kernel - [PATCH v2] drm: bridge: cdns-mhdp8546: Move mode_valid hook to drm_bridge

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Date: Thu, 30 May 2024 14:47:57 +0530
From: Jayesh Choudhary <j-choudhary@...com>
To: <linux-kernel@...r.kernel.org>, <dmitry.baryshkov@...aro.org>,
        <andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>,
        <rfoss@...nel.org>, <Laurent.pinchart@...asonboard.com>,
        <j-choudhary@...com>
CC: <jonas@...boo.se>, <jernej.skrabec@...il.com>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
        <a-bhatia1@...com>, <u.kleine-koenig@...gutronix.de>,
        <javierm@...hat.com>, <jani.nikula@...el.com>,
        <dri-devel@...ts.freedesktop.org>
Subject: [PATCH v2] drm: bridge: cdns-mhdp8546: Move mode_valid hook to drm_bridge_funcs

With the support for the 'DRM_BRIDGE_ATTACH_NO_CONNECTOR' case,
the connector_helper funcs are not initialized if the encoder has this
flag in its bridge_attach call. Till now we had mode_valid hook only in
the drm_connector_helper_funcs. Move this hook to drm_bridge_funcs to
validate the modes.

Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
---

Changelog v1->v2:
- Remove mode_valid hook from connector_helper_funcs as it is not required.
  (Function despite being identical has been moved below with other
   bridge_funcs instead of keeping it up with drm_connector_helper_funcs)

v1 patch:
<https://lore.kernel.org/all/20240524071348.106210-1-j-choudhary@ti.com/>

 .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 39 ++++++++++---------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 8a91ef0ae065..8a6cd00a1443 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1617,24 +1617,6 @@ bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp,
 	return true;
 }
 
-static
-enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn,
-					  struct drm_display_mode *mode)
-{
-	struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
-
-	mutex_lock(&mhdp->link_mutex);
-
-	if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
-				    mhdp->link.rate)) {
-		mutex_unlock(&mhdp->link_mutex);
-		return MODE_CLOCK_HIGH;
-	}
-
-	mutex_unlock(&mhdp->link_mutex);
-	return MODE_OK;
-}
-
 static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn,
 					    struct drm_atomic_state *state)
 {
@@ -1678,7 +1660,6 @@ static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn,
 static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = {
 	.detect_ctx = cdns_mhdp_connector_detect,
 	.get_modes = cdns_mhdp_get_modes,
-	.mode_valid = cdns_mhdp_mode_valid,
 	.atomic_check = cdns_mhdp_connector_atomic_check,
 };
 
@@ -2233,6 +2214,25 @@ static const struct drm_edid *cdns_mhdp_bridge_edid_read(struct drm_bridge *brid
 	return cdns_mhdp_edid_read(mhdp, connector);
 }
 
+static enum drm_mode_status
+cdns_mhdp_bridge_mode_valid(struct drm_bridge *bridge,
+			    const struct drm_display_info *info,
+			    const struct drm_display_mode *mode)
+{
+	struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
+
+	mutex_lock(&mhdp->link_mutex);
+
+	if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
+				    mhdp->link.rate)) {
+		mutex_unlock(&mhdp->link_mutex);
+		return MODE_CLOCK_HIGH;
+	}
+
+	mutex_unlock(&mhdp->link_mutex);
+	return MODE_OK;
+}
+
 static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
 	.atomic_enable = cdns_mhdp_atomic_enable,
 	.atomic_disable = cdns_mhdp_atomic_disable,
@@ -2247,6 +2247,7 @@ static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
 	.edid_read = cdns_mhdp_bridge_edid_read,
 	.hpd_enable = cdns_mhdp_bridge_hpd_enable,
 	.hpd_disable = cdns_mhdp_bridge_hpd_disable,
+	.mode_valid = cdns_mhdp_bridge_mode_valid,
 };
 
 static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse)
-- 
2.25.1