drm/bridge: dw-hdmi: set mtmdsclock for deep color

Configure the correct mtmdsclock for deep colors to prepare support
for 10, 12 & 16bit output.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Jernej Škrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200304104052.17196-2-narmstrong@baylibre.com

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 9bad194cfd0aea3a1efde82fa3d93f21b0f022f3..10f98c9ee77e4c48f62b67fa2a1e02687edc9b4f 100644 (file)
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1814,13 +1814,32 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
        int hblank, vblank, h_de_hs, v_de_vs, hsync_len, vsync_len;
        unsigned int vdisplay, hdisplay;
 
-       vmode->mtmdsclock = vmode->mpixelclock = mode->clock * 1000;
+       vmode->mpixelclock = mode->clock * 1000;
 
        dev_dbg(hdmi->dev, "final pixclk = %d\n", vmode->mpixelclock);
 
+       vmode->mtmdsclock = vmode->mpixelclock;
+
+       if (!hdmi_bus_fmt_is_yuv422(hdmi->hdmi_data.enc_out_bus_format)) {
+               switch (hdmi_bus_fmt_color_depth(
+                               hdmi->hdmi_data.enc_out_bus_format)) {
+               case 16:
+                       vmode->mtmdsclock = vmode->mpixelclock * 2;
+                       break;
+               case 12:
+                       vmode->mtmdsclock = vmode->mpixelclock * 3 / 2;
+                       break;
+               case 10:
+                       vmode->mtmdsclock = vmode->mpixelclock * 5 / 4;
+                       break;
+               }
+       }
+
        if (hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format))
                vmode->mtmdsclock /= 2;
 
+       dev_dbg(hdmi->dev, "final tmdsclock = %d\n", vmode->mtmdsclock);
+
        /* Set up HDMI_FC_INVIDCONF */
        inv_val = (hdmi->hdmi_data.hdcp_enable ||
                   (dw_hdmi_support_scdc(hdmi) &&