Commit 3880f62e authored by Heiko Stuebner's avatar Heiko Stuebner

drm/rockchip: add function to check if endpoint is a subdriver

To be able to have both internal subdrivers and external bridge
drivers as output endpoints of vops, add a function to be able
to distinguish these.

changes in v8:
- improved function documentation
- better error handling
- put calls for node and pdev references
changes in v6:
- added function to check subdriver vs. bridge
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Reviewed-by: default avatarSandy Huang <hjc@rock-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180830211207.10480-2-heiko@sntech.de
parent 633ba1e0
......@@ -24,6 +24,7 @@
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/of_platform.h>
#include <linux/component.h>
#include <linux/console.h>
#include <linux/iommu.h>
......@@ -267,6 +268,53 @@ static const struct dev_pm_ops rockchip_drm_pm_ops = {
static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
static int num_rockchip_sub_drivers;
/*
* Check if a vop endpoint is leading to a rockchip subdriver or bridge.
* Should be called from the component bind stage of the drivers
* to ensure that all subdrivers are probed.
*
* @ep: endpoint of a rockchip vop
*
* returns true if subdriver, false if external bridge and -ENODEV
* if remote port does not contain a device.
*/
int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
{
struct device_node *node = of_graph_get_remote_port_parent(ep);
struct platform_device *pdev;
struct device_driver *drv;
int i;
if (!node)
return -ENODEV;
/* status disabled will prevent creation of platform-devices */
pdev = of_find_device_by_node(node);
of_node_put(node);
if (!pdev)
return -ENODEV;
/*
* All rockchip subdrivers have probed at this point, so
* any device not having a driver now is an external bridge.
*/
drv = pdev->dev.driver;
if (!drv) {
platform_device_put(pdev);
return false;
}
for (i = 0; i < num_rockchip_sub_drivers; i++) {
if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
platform_device_put(pdev);
return true;
}
}
platform_device_put(pdev);
return false;
}
static int compare_dev(struct device *dev, void *data)
{
return dev == (struct device *)data;
......
......@@ -64,6 +64,7 @@ void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
struct device *dev);
int rockchip_drm_wait_vact_end(struct drm_crtc *crtc, unsigned int mstimeout);
int rockchip_drm_endpoint_is_subdriver(struct device_node *ep);
extern struct platform_driver cdn_dp_driver;
extern struct platform_driver dw_hdmi_rockchip_pltfm_driver;
extern struct platform_driver dw_mipi_dsi_driver;
......
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