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drm/rockchip: rgb: don't count non-existent devices when determining subdrivers 

rockchip_drm_endpoint_is_subdriver() may also return error codes.
For example if the target-node is in the disabled state, so no
platform-device is getting created for it.

In that case current code would count that as external rgb device,
which in turn would make probing the rockchip-drm device fail.

So only count the target as rgb device if the function actually
returns 0.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200121224828.4070067-1-heiko@sntech.de
This commit is contained in:
Heiko Stuebner 2020-01-21 23:48:28 +01:00 committed by Heiko Stuebner
parent 8efef33eff
commit 7cd7943dc5
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/rockchip/rockchip_rgb.c
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@ -98,7 +98,8 @@ struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
if (of_property_read_u32(endpoint, "reg", &endpoint_id))
endpoint_id = 0;
if (rockchip_drm_endpoint_is_subdriver(endpoint) > 0)
/* if subdriver (> 0) or error case (< 0), ignore entry */
if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
continue;
child_count++;