[RFC/RFT PATCH 4/4] drm/bridge: dw-hdmi: Take input format from plat_data

[Neil Armstrong]

Some display pipelines can only provide non-RBG input pixels to the HDMI TX
Controller, this patch takes the pixel format from the plat_data if provided.

Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
---
 drivers/gpu/drm/bridge/dw-hdmi.c | 7 +++++--
 include/drm/bridge/dw_hdmi.h     | 9 +++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
index 8a6a183..fa4147c 100644
--- a/drivers/gpu/drm/bridge/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/dw-hdmi.c
@@ -1420,8 +1420,11 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
 	hdmi->hdmi_data.video_mode.mpixelrepetitionoutput = 0;
 	hdmi->hdmi_data.video_mode.mpixelrepetitioninput = 0;
 
-	/* TODO: Get input format from IPU (via FB driver interface) */
-	hdmi->hdmi_data.enc_in_format = RGB;
+	/* Get input format from plat data or fallback to RGB */
+	if (hdmi->plat_data->input_fmt >= 0)
+		hdmi->hdmi_data.enc_in_format = hdmi->plat_data->input_fmt;
+	else
+		hdmi->hdmi_data.enc_in_format = RGB;
 
 	hdmi->hdmi_data.enc_out_format = RGB;
 
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index d6a0ab3..4f426c3 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -21,6 +21,14 @@ enum {
 	DW_HDMI_RES_MAX,
 };
 
+enum {
+	DW_HDMI_INPUT_FMT_RGB = 0,
+	DW_HDMI_INPUT_FMT_YCBCR444,
+	DW_HDMI_INPUT_FMT_YCBCR422_16BITS,
+	DW_HDMI_INPUT_FMT_YCBCR422_8BITS,
+	DW_HDMI_INPUT_FMT_XVYCC444,
+};
+
 enum dw_hdmi_phy_type {
 	DW_HDMI_PHY_DWC_HDMI_TX_PHY = 0x00,
 	DW_HDMI_PHY_DWC_MHL_PHY_HEAC = 0xb2,
@@ -68,6 +76,7 @@ struct dw_hdmi_plat_data {
 				 const struct dw_hdmi_plat_data *data);
 	bool (*hdmi_read_hpd)(struct dw_hdmi *hdmi,
 			      const struct dw_hdmi_plat_data *data);
+	int input_fmt;
 };
 
 int dw_hdmi_probe(struct platform_device *pdev,
-- 
1.9.1