[PATCH v1 7/8] drm: rockchip: analogix_dp: correct the connector display color format and bpc

[Yakir Yang]

Rockchip VOP couldn't output YUV video format for eDP controller, so
when driver detect connector support YUV video format, we need to hack
it down to RGB888.

Signed-off-by: Yakir Yang <ykk at rock-chips.com>
---
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index adb38b2..a51e086 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -102,6 +102,24 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 	return 0;
 }
 
+static enum drm_mode_status
+rockchip_dp_mode_valid(struct analogix_dp_plat_data *plat_data,
+		       struct drm_connector *connector,
+		       struct drm_display_mode *mode)
+{
+	struct drm_display_info *di = &connector->display_info;
+
+	if (di->color_formats & DRM_COLOR_FORMAT_YCRCB444 ||
+	    di->color_formats & DRM_COLOR_FORMAT_YCRCB422) {
+		di->color_formats &= ~(DRM_COLOR_FORMAT_YCRCB422 |
+				       DRM_COLOR_FORMAT_YCRCB444);
+		di->color_formats |= DRM_COLOR_FORMAT_RGB444;
+		di->bpc = 8;
+	}
+
+	return MODE_OK;
+}
+
 static bool
 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 				   const struct drm_display_mode *mode,
@@ -300,6 +318,7 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 	dp->plat_data.dev_type = ROCKCHIP_DP;
 	dp->plat_data.power_on = rockchip_dp_poweron;
 	dp->plat_data.power_off = rockchip_dp_powerdown;
+	dp->plat_data.mode_valid = rockchip_dp_mode_valid;
 
 	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 }
-- 
1.9.1