[PATCH v7 1/3] drm/tockchip: add function to check if endpoint is a subdriver

From: Sandy Huang
Date: Tue Aug 28 2018 - 23:13:03 EST


From: Heiko Stuebner <heiko@xxxxxxxxx>

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.

Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
---
drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 27 +++++++++++++++++++++++++++
drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 1 +
2 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 1d9c4a9..d18f7f8 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -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 +268,32 @@ 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 output-endpoint is a subdriver or bridge.
+ */
+bool rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
+{
+ struct device_node *node = of_graph_get_remote_port_parent(ep);
+ struct platform_device *pdev;
+ int i;
+
+ if (!node)
+ return false;
+
+ pdev = of_find_device_by_node(node);
+ if (!pdev)
+ return false;
+
+ for (i = 0; i < num_rockchip_sub_drivers; i++) {
+ struct device_driver *drv = pdev->dev.driver;
+
+ if (rockchip_sub_drivers[i] == to_platform_driver(drv))
+ return true;
+ }
+
+ return false;
+}
+
static int compare_dev(struct device *dev, void *data)
{
return dev == (struct device *)data;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
index d67ad0a..305b485 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -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);

+bool 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;
--
2.7.4