[PATCH 3/5] drm/i2c: tda998x: add support for writing SPD

[Russell King]

Add support for writing the SPD infoframe to the TDA998x.  Identify us
as "Generic" vendor "PC" product, and as "PC general" source device
information.

Signed-off-by: Russell King <rmk+kernel at armlinux.org.uk>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index c399a7b73e2b..dad7396ebe2b 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -845,6 +845,23 @@ static int tda998x_write_aif(struct tda998x_priv *priv,
 	return 0;
 }
 
+static void tda998x_write_spd(struct tda998x_priv *priv)
+{
+	union hdmi_infoframe frame;
+	int ret;
+
+	ret = hdmi_spd_infoframe_init(&frame.spd, "Generic", "PC");
+	if (ret < 0) {
+		dev_err(&priv->hdmi->dev, "failed to fill SPD infoframe: %d\n",
+			ret);
+		return;
+	}
+
+	frame.spd.sdi = HDMI_SPD_SDI_PC;
+
+	tda998x_write_if(priv, DIP_IF_FLAGS_IF3, REG_IF3_HB0, &frame);
+}
+
 static void
 tda998x_write_avi(struct tda998x_priv *priv, const struct drm_display_mode *mode)
 {
@@ -1554,6 +1571,7 @@ static void tda998x_bridge_mode_set(struct drm_bridge *bridge,
 		reg_set(priv, REG_TX33, TX33_HDMI);
 
 		tda998x_write_avi(priv, adjusted_mode);
+		tda998x_write_spd(priv);
 
 		if (priv->audio_params.format != AFMT_UNUSED &&
 		    priv->sink_has_audio)
-- 
2.7.4