linux-kernel - [PATCH v2 3/3] drm/bridge: ti-sn65dsi86: Add NO

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Date:   Mon, 20 Sep 2021 15:58:00 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org,
        Douglas Anderson <dianders@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Clark <robdclark@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 3/3] drm/bridge: ti-sn65dsi86: Add NO_CONNECTOR support

From: Rob Clark <robdclark@...omium.org>

Slightly awkward to fish out the display_info when we aren't creating
own connector.  But I don't see an obvious better way.

v2: Remove error return with NO_CONNECTOR flag

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 39 ++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 6154bed0af5b..94c94cc8a4d8 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -667,11 +667,6 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 						   .node = NULL,
 						 };
 
-	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
-		DRM_ERROR("Fix bridge driver to make connector optional!");
-		return -EINVAL;
-	}
-
 	pdata->aux.drm_dev = bridge->dev;
 	ret = drm_dp_aux_register(&pdata->aux);
 	if (ret < 0) {
@@ -679,9 +674,11 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 		return ret;
 	}
 
-	ret = ti_sn_bridge_connector_init(pdata);
-	if (ret < 0)
-		goto err_conn_init;
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		ret = ti_sn_bridge_connector_init(pdata);
+		if (ret < 0)
+			goto err_conn_init;
+	}
 
 	/*
 	 * TODO: ideally finding host resource and dsi dev registration needs
@@ -743,7 +740,8 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 err_dsi_attach:
 	mipi_dsi_device_unregister(dsi);
 err_dsi_host:
-	drm_connector_cleanup(&pdata->connector);
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
+		drm_connector_cleanup(&pdata->connector);
 err_conn_init:
 	drm_dp_aux_unregister(&pdata->aux);
 	return ret;
@@ -792,9 +790,30 @@ static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata)
 	regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
 }
 
+/*
+ * Find the connector and fish out the bpc from display_info.  It would
+ * be nice if we could get this instead from drm_bridge_state, but that
+ * doesn't yet appear to be the case.
+ */
 static unsigned int ti_sn_bridge_get_bpp(struct ti_sn65dsi86 *pdata)
 {
-	if (pdata->connector.display_info.bpc <= 6)
+	struct drm_bridge *bridge = &pdata->bridge;
+	struct drm_connector_list_iter conn_iter;
+	struct drm_connector *connector;
+	unsigned bpc = 0;
+
+	drm_connector_list_iter_begin(bridge->dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		if (drm_connector_has_possible_encoder(connector, bridge->encoder)) {
+			bpc = connector->display_info.bpc;
+			break;
+		}
+	}
+	drm_connector_list_iter_end(&conn_iter);
+
+	WARN_ON(bpc == 0);
+
+	if (bpc <= 6)
 		return 18;
 	else
 		return 24;
-- 
2.31.1