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From:   Ville Baillie <vmbaillie@googlemail.com>
Date:   Thu, 1 Aug 2019 11:18:53 +0000
To:     marex@denx.de, stefan@agner.ch, airlied@linux.ie, daniel@ffwll.ch,
        shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de,
        festevam@gmail.com, linux-imx@nxp.com,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] mxsfb: allow attachment of display bridges
Message-ID: <20190801111853.GA24574@villeb-dev>
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---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 20 ++++++++++++++++----
 drivers/gpu/drm/mxsfb/mxsfb_drv.h |  1 +
 drivers/gpu/drm/mxsfb/mxsfb_out.c | 14 +++++++++++---
 3 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 6fafc90da4ec..c19a7b7aa3a6 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -229,10 +229,22 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 		goto err_vblank;
 	}
 
-	ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
-	if (ret) {
-		dev_err(drm->dev, "Cannot connect panel\n");
-		goto err_vblank;
+	if (mxsfb->panel) {
+		ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
+		if (ret) {
+			dev_err(drm->dev, "Cannot connect panel\n");
+			goto err_vblank;
+		}
+	} else if (mxsfb->bridge) {
+		ret = drm_bridge_attach(&mxsfb->pipe.encoder, mxsfb->bridge,
+				NULL);
+		if (ret) {
+			dev_err(drm->dev, "Cannot connect bridge\n");
+			goto err_vblank;
+		}
+	} else {
+		dev_err(drm->dev, "No panel or bridge\n");
+		return -EINVAL;
 	}
 
 	drm->mode_config.min_width	= MXSFB_MIN_XRES;
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
index d975300dca05..436fe4bbb47a 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
@@ -29,6 +29,7 @@ struct mxsfb_drm_private {
 	struct drm_simple_display_pipe	pipe;
 	struct drm_connector		connector;
 	struct drm_panel		*panel;
+	struct drm_bridge		*bridge;
 };
 
 int mxsfb_setup_crtc(struct drm_device *dev);
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_out.c b/drivers/gpu/drm/mxsfb/mxsfb_out.c
index 91e76f9cead6..77e03eb0fca6 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_out.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_out.c
@@ -78,9 +78,11 @@ int mxsfb_create_output(struct drm_device *drm)
 {
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
 	struct drm_panel *panel;
+	struct drm_bridge *bridge;
 	int ret;
 
-	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
+	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
+			&bridge);
 	if (ret)
 		return ret;
 
@@ -91,8 +93,14 @@ int mxsfb_create_output(struct drm_device *drm)
 	ret = drm_connector_init(drm, &mxsfb->connector,
 				 &mxsfb_panel_connector_funcs,
 				 DRM_MODE_CONNECTOR_Unknown);
-	if (!ret)
-		mxsfb->panel = panel;
+	if (!ret) {
+		if (panel)
+			mxsfb->panel = panel;
+		else if (bridge)
+			mxsfb->bridge = bridge;
+		else
+			return -EINVAL;
+	}
 
 	return ret;
 }
-- 
2.17.1