linux-kernel - [PATCH v5 3/6] drm/vc4: Delay DSI host registration until the panel has probed.

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Message-Id: <20170718210510.12229-3-eric@anholt.net>
Date:   Tue, 18 Jul 2017 14:05:07 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>
Subject: [PATCH v5 3/6] drm/vc4: Delay DSI host registration until the panel has probed.

The vc4 driver was unusual in that it was delaying the panel lookup
until the attach step, while most DSI hosts will -EPROBE_DEFER until
they get a panel.

v2: Drop a debug message that slipped in.

Signed-off-by: Eric Anholt <eric@...olt.net>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com> (v1)
---
 drivers/gpu/drm/vc4/vc4_dsi.c | 38 ++++++++++++++------------------------
 1 file changed, 14 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 57213f4e3c72..769f247c52a9 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -33,6 +33,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
@@ -504,7 +505,6 @@ struct vc4_dsi {
 	struct mipi_dsi_host dsi_host;
 	struct drm_encoder *encoder;
 	struct drm_bridge *bridge;
-	bool is_panel_bridge;
 
 	void __iomem *regs;
 
@@ -1289,7 +1289,6 @@ static int vc4_dsi_host_attach(struct mipi_dsi_host *host,
 			       struct mipi_dsi_device *device)
 {
 	struct vc4_dsi *dsi = host_to_dsi(host);
-	int ret = 0;
 
 	dsi->lanes = device->lanes;
 	dsi->channel = device->channel;
@@ -1324,34 +1323,12 @@ static int vc4_dsi_host_attach(struct mipi_dsi_host *host,
 		return 0;
 	}
 
-	dsi->bridge = of_drm_find_bridge(device->dev.of_node);
-	if (!dsi->bridge) {
-		struct drm_panel *panel =
-			of_drm_find_panel(device->dev.of_node);
-
-		dsi->bridge = drm_panel_bridge_add(panel,
-						   DRM_MODE_CONNECTOR_DSI);
-		if (IS_ERR(dsi->bridge)) {
-			ret = PTR_ERR(dsi->bridge);
-			dsi->bridge = NULL;
-			return ret;
-		}
-		dsi->is_panel_bridge = true;
-	}
-
 	return drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);
 }
 
 static int vc4_dsi_host_detach(struct mipi_dsi_host *host,
 			       struct mipi_dsi_device *device)
 {
-	struct vc4_dsi *dsi = host_to_dsi(host);
-
-	if (dsi->is_panel_bridge) {
-		drm_panel_bridge_remove(dsi->bridge);
-		dsi->bridge = NULL;
-	}
-
 	return 0;
 }
 
@@ -1495,6 +1472,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_dsi *dsi;
 	struct vc4_dsi_encoder *vc4_dsi_encoder;
+	struct drm_panel *panel;
 	const struct of_device_id *match;
 	dma_cap_mask_t dma_mask;
 	int ret;
@@ -1598,6 +1576,18 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 	}
 
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
+					  &panel, &dsi->bridge);
+	if (ret)
+		return ret;
+
+	if (panel) {
+		dsi->bridge = devm_drm_panel_bridge_add(dev, panel,
+							DRM_MODE_CONNECTOR_DSI);
+		if (IS_ERR(dsi->bridge))
+			return PTR_ERR(dsi->bridge);
+	}
+
 	/* The esc clock rate is supposed to always be 100Mhz. */
 	ret = clk_set_rate(dsi->escape_clock, 100 * 1000000);
 	if (ret) {
-- 
2.11.0