[PATCH 5/6] drm/rockchip: dw_hdmi: Add get_output_bus_format

[Algea Cao]

Add get_output_bus_format in dw_hdmi_plat_data to get
hdmi output bus format. The output bus format is determined
by color format and depth, which can be set by rockchip
hdmi properties.

Signed-off-by: Algea Cao <algea....@rock-chips.com>
---

 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 47 +++++++++++++++++++++
 include/drm/bridge/dw_hdmi.h                |  1 +
 2 files changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c 
b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 8f22d9a566db..a602d25639a7 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -100,6 +100,7 @@ struct rockchip_hdmi {
 
        unsigned int colordepth;
        enum drm_hdmi_output_type hdmi_output;
+       unsigned long output_bus_format;
 };
 
 #define to_rockchip_hdmi(x)    container_of(x, struct rockchip_hdmi, x)
@@ -498,6 +499,50 @@ static const struct dw_hdmi_property_ops 
dw_hdmi_rockchip_property_ops = {
        .get_property           = dw_hdmi_rockchip_get_property,
 };
 
+static void
+dw_hdmi_rockchip_output_bus_format_select(struct rockchip_hdmi *hdmi)
+{
+       unsigned long bus_format;
+
+       if (hdmi->hdmi_output == DRM_HDMI_OUTPUT_YCBCR420) {
+               if (hdmi->colordepth > 8)
+                       bus_format = MEDIA_BUS_FMT_UYYVYY10_0_5X30;
+               else
+                       bus_format = MEDIA_BUS_FMT_UYYVYY8_0_5X24;
+       } else if (hdmi->hdmi_output == DRM_HDMI_OUTPUT_YCBCR422) {
+               if (hdmi->colordepth == 12)
+                       bus_format = MEDIA_BUS_FMT_UYVY12_1X24;
+               else if (hdmi->colordepth == 10)
+                       bus_format = MEDIA_BUS_FMT_UYVY10_1X20;
+               else
+                       bus_format = MEDIA_BUS_FMT_UYVY8_1X16;
+       } else {
+               if (hdmi->colordepth > 8) {
+                       if (hdmi->hdmi_output != DRM_HDMI_OUTPUT_DEFAULT_RGB)
+                               bus_format = MEDIA_BUS_FMT_YUV10_1X30;
+                       else
+                               bus_format = MEDIA_BUS_FMT_RGB101010_1X30;
+               } else {
+                       if (hdmi->hdmi_output != DRM_HDMI_OUTPUT_DEFAULT_RGB)
+                               bus_format = MEDIA_BUS_FMT_YUV8_1X24;
+                       else
+                               bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+               }
+       }
+
+       hdmi->output_bus_format = bus_format;
+}
+
+static unsigned long
+dw_hdmi_rockchip_get_output_bus_format(void *data)
+{
+       struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
+
+       dw_hdmi_rockchip_output_bus_format_select(hdmi);
+
+       return hdmi->output_bus_format;
+}
+
 static void dw_hdmi_rk3228_setup_hpd(struct dw_hdmi *dw_hdmi, void *data)
 {
        struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
@@ -685,6 +730,8 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct 
device *master,
 
        plat_data->property_ops = &dw_hdmi_rockchip_property_ops;
 
+       plat_data->get_output_bus_format =
+               dw_hdmi_rockchip_get_output_bus_format;
        encoder = &hdmi->encoder;
 
        encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index dc561ebe7a9b..13495f810328 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -175,6 +175,7 @@ struct dw_hdmi_plat_data {
        const struct dw_hdmi_phy_config *phy_config;
        int (*configure_phy)(struct dw_hdmi *hdmi, void *data,
                             unsigned long mpixelclock);
+       unsigned long (*get_output_bus_format)(void *data);
 };
 
 struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
-- 
2.25.1