linux-kernel - [PATCH] omapfb: In omapfb_probe return -EPROBE_DEFER when display driver is not loaded yet

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Message-Id: <1373461739-10168-1-git-send-email-pali.rohar@gmail.com>
Date:	Wed, 10 Jul 2013 15:08:59 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc:	linux-omap@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Tony Lindgren <tony@...mide.com>,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH] omapfb: In omapfb_probe return -EPROBE_DEFER when display driver is not loaded yet

* On RX-51 probing for acx565akm driver is later then for omapfb which cause that omapfb probe fail and framebuffer is not working
* EPROBE_DEFER causing that kernel try to probe for omapfb later again which fixing this problem

* Without this patch display on Nokia RX-51 (N900) phone not working

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 drivers/video/omap2/omapfb/omapfb-main.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/video/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c
index 856917b..93e7c84 100644
--- a/drivers/video/omap2/omapfb/omapfb-main.c
+++ b/drivers/video/omap2/omapfb/omapfb-main.c
@@ -2419,6 +2419,15 @@ static int omapfb_probe(struct platform_device *pdev)
 	if (omapdss_is_initialized() == false)
 		return -EPROBE_DEFER;
 
+	dssdev = NULL;
+	for_each_dss_dev(dssdev) {
+		if (!dssdev->driver) {
+			dev_warn(&pdev->dev, "no driver for display: %s\n",
+				dssdev->name);
+			return -EPROBE_DEFER;
+		}
+	}
+
 	if (pdev->num_resources != 0) {
 		dev_err(&pdev->dev, "probed for an unknown device\n");
 		r = -ENODEV;
-- 
1.7.10.4

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