gpu: ipu-v3: default to id 0 on missing OF alias

BugLink: https://bugs.launchpad.net/bugs/1836117
[ 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@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 658fa2d3e40c260d051d4299bda4eddb0af5abeb..2c8411b8d050d6d758522a9866e1cd2d3dfebb7d 100644 (file)
--- 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)) {