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drm/rockchip: Add device links for master and components 

Since we are trying to access components' resources in the master's
suspend/resume PM callbacks(e.g. panel), add device links to correct
the suspend/resume and shutdown ordering.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207175309.21095-1-enric.balletbo@collabora.com
This commit is contained in:
Jeffy Chen 2018-02-07 18:53:09 +01:00 committed by Heiko Stuebner
parent 7628166d5e
commit 7d4e981d41
1 changed files with 22 additions and 1 deletions
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23
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
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@ -314,6 +314,14 @@ static int compare_dev(struct device *dev, void *data)
return dev == (struct device *)data;
}
static void rockchip_drm_match_remove(struct device *dev)
{
struct device_link *link;
list_for_each_entry(link, &dev->links.consumers, s_node)
device_link_del(link);
}
static struct component_match *rockchip_drm_match_add(struct device *dev)
{
struct component_match *match = NULL;
@ -331,10 +339,15 @@ static struct component_match *rockchip_drm_match_add(struct device *dev)
if (!d)
break;
device_link_add(dev, d, DL_FLAG_STATELESS);
component_match_add(dev, &match, compare_dev, d);
} while (true);
}
if (IS_ERR(match))
rockchip_drm_match_remove(dev);
return match ?: ERR_PTR(-ENODEV);
}
@ -411,13 +424,21 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
if (IS_ERR(match))
return PTR_ERR(match);
return component_master_add_with_match(dev, &rockchip_drm_ops, match);
ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
if (ret < 0) {
rockchip_drm_match_remove(dev);
return ret;
}
return 0;
}
static int rockchip_drm_platform_remove(struct platform_device *pdev)
{
component_master_del(&pdev->dev, &rockchip_drm_ops);
rockchip_drm_match_remove(&pdev->dev);
return 0;
}