CHROMIUM: drm: bridge/dw_hdmi: assign CD field to zero

When the color depth is 24 bits per pixel video, the CD
field in General Control Packet should be "Color Depth
not indicated", then the colordepth in register vp_pr_cd
& csc_scale should assign to zero.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
BUG=chrome-os-partner:38212
TEST=speedy board, Test with Agilent Technologies U4002A
     HDMI Protocal Analyzer

Change-Id: Ifd5767d339fdbff11e234ec0891c8f3df1dd66a5
Reviewed-on: https://chromium-review.googlesource.com/261850
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Yakir Yang <ykk@rock-chips.com>
Commit-Queue: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
index d05e1095a0ec5673b86f1fba66b45d8b55226869..3aa550748b1104f0dd27e17bf62c175faab241e5 100644 (file)
--- a/drivers/gpu/drm/bridge/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/dw-hdmi.c
@@ -923,7 +923,7 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
                if (!hdmi_data->enc_color_depth) {
                        output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
                } else if (hdmi_data->enc_color_depth == 8) {
-                       color_depth = 4;
+                       color_depth = 0;
                        output_select = HDMI_VP_CONF_OUTPUT_SELECTOR_BYPASS;
                } else if (hdmi_data->enc_color_depth == 10) {
                        color_depth = 5;