[PATCH 09/13] [NOT FOR REVIEW NOW] drm: bridge: Add a pre_init function for the dw_hdmi driver

[Icenowy Zheng]

From: Jernej Skrabec <jernej.skra...@siol.net>

Some platform glues of DesignWare HDMI controller require some
initialization to be performed before probing the main HDMI controller.

Add a pre_init function for this kind of work.

Signed-off-by: Jernej Skrabec <jernej.skra...@siol.net>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 3 +++
 include/drm/bridge/dw_hdmi.h              | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c 
b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 6c6466c6297c..1e69b7631cae 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2343,6 +2343,9 @@ __dw_hdmi_probe(struct platform_device *pdev,
                goto err_isfr;
        }
 
+       if (plat_data->pre_init)
+               plat_data->pre_init(plat_data->pre_init_data);
+
        /* Product and revision IDs */
        hdmi->version = (hdmi_readb(hdmi, HDMI_DESIGN_ID) << 8)
                      | (hdmi_readb(hdmi, HDMI_REVISION_ID) << 0);
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 182f83283e24..6e109c336ca1 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -128,6 +128,8 @@ struct dw_hdmi_plat_data {
                                           const struct drm_display_mode *mode);
        unsigned long input_bus_format;
        unsigned long input_bus_encoding;
+       void (*pre_init)(void *data);
+       void *pre_init_data;
 
        /* Vendor PHY support */
        const struct dw_hdmi_phy_ops *phy_ops;
-- 
2.13.0