linux-kernel - [PATCHv5 2/6] drm/omap: populate DSI platform bus earlier

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Date:   Wed, 21 Nov 2018 17:09:12 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Sebastian Reichel <sre@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        dri-devel@...ts.freedesktop.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: [PATCHv5 2/6] drm/omap: populate DSI platform bus earlier

After the changes from 4.20 the DSI encoder tries to find the
attached panel before populating the DSI bus. If the panel is
not found -EPROBE_DEFER is returned, so the DSI bus is never
populated and the panel never added.

Fix this by populating the DSI bus before searching for the
video sink in dsi_init_output().

Fixes: 27d624527d992 ("drm/omap: dss: Acquire next dssdev at probe time")
Acked-by: Pavel Machek <pavel@....cz>
Tested-by: Tony Lindgren <tony@...mide.com>
Tested-by: Pavel Machek <pavel@....cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
 drivers/gpu/drm/omapdrm/dss/dsi.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 0a485c5b982e..00a9c2ab9e6c 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -5418,9 +5418,15 @@ static int dsi_probe(struct platform_device *pdev)
 		dsi->num_lanes_supported = 3;
 	}
 
+	r = of_platform_populate(dev->of_node, NULL, NULL, dev);
+	if (r) {
+		DSSERR("Failed to populate DSI child devices: %d\n", r);
+		goto err_pm_disable;
+	}
+
 	r = dsi_init_output(dsi);
 	if (r)
-		goto err_pm_disable;
+		goto err_of_depopulate;
 
 	r = dsi_probe_of(dsi);
 	if (r) {
@@ -5428,22 +5434,16 @@ static int dsi_probe(struct platform_device *pdev)
 		goto err_uninit_output;
 	}
 
-	r = of_platform_populate(dev->of_node, NULL, NULL, dev);
-	if (r) {
-		DSSERR("Failed to populate DSI child devices: %d\n", r);
-		goto err_uninit_output;
-	}
-
 	r = component_add(&pdev->dev, &dsi_component_ops);
 	if (r)
-		goto err_of_depopulate;
+		goto err_uninit_output;
 
 	return 0;
 
-err_of_depopulate:
-	of_platform_depopulate(dev);
 err_uninit_output:
 	dsi_uninit_output(dsi);
+err_of_depopulate:
+	of_platform_depopulate(dev);
 err_pm_disable:
 	pm_runtime_disable(dev);
 	return r;
-- 
2.19.1