[PATCH v4 5/6] drm/rockchip: dw_hdmi: store rockchip_hdmi reference in phy_data object

[heiko@sntech.de (Heiko Stuebner)]

When using special phy handling operations we'll often need access to
the rockchip_hdmi struct.

As the chip-data that occupies the phy_data pointer initially gets
assigned to the rockchip_hdmi struct, we can now re-use this phy_data
pointer to hold the reference to the rockchip_hdmi struct and use this
reference later on.

Inspiration for this comes from meson and sunxi dw-hdmi, which are using
the same method.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>

changes in v3:
- reword commit message
---
 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 57e76dfd5f6d..19f002fa0a09 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -335,7 +335,7 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 				 void *data)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	const struct dw_hdmi_plat_data *plat_data;
+	struct dw_hdmi_plat_data *plat_data;
 	const struct of_device_id *match;
 	struct drm_device *drm = data;
 	struct drm_encoder *encoder;
@@ -350,9 +350,14 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 		return -ENOMEM;
 
 	match = of_match_node(dw_hdmi_rockchip_dt_ids, pdev->dev.of_node);
-	plat_data = match->data;
+	plat_data = devm_kmemdup(&pdev->dev, match->data,
+					     sizeof(*plat_data), GFP_KERNEL);
+	if (!plat_data)
+		return -ENOMEM;
+
 	hdmi->dev = &pdev->dev;
 	hdmi->chip_data = plat_data->phy_data;
+	plat_data->phy_data = hdmi;
 	encoder = &hdmi->encoder;
 
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
-- 
2.17.0