linux-kernel - [PATCH AUTOSEL 4.18 027/131] gpu: ipu-v3: default to id 0 on missing OF alias

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Message-ID: <20180902064601.183036-27-alexander.levin@microsoft.com>
Date:   Sun, 2 Sep 2018 13:03:32 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 027/131] gpu: ipu-v3: default to id 0 on missing
 OF alias

From: Philipp Zabel <p.zabel@...gutronix.de>

[ Upstream commit 2d87e6c1b99c402360fdfe19ce4f579ab2f96adf ]

This is better than storing -ENODEV in the id number. This fixes SoCs
with only one IPU that don't specify an IPU alias in the device tree.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/ipu-v3/ipu-common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 48685cddbad1..c73bd003f845 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -1401,6 +1401,8 @@ static int ipu_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	ipu->id = of_alias_get_id(np, "ipu");
+	if (ipu->id < 0)
+		ipu->id = 0;
 
 	if (of_device_is_compatible(np, "fsl,imx6qp-ipu") &&
 	    IS_ENABLED(CONFIG_DRM)) {
-- 
2.17.1