drm/i2c: tda998x: only configure infoframes and audio if supported
The CEA 861B specification indicates the situations when we are able to
send each infoframe based on the version of the EDID's CEA extension.
Update the tda998x driver to follow the CEA specification wrt sending
of infoframes.
Since we only support the generation of AVI version 2, this limits us
to CEA extension version 3, so we treat CEA extension version 2 as
CEA 861 (no infoframes, no audio.)
Tested-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Jon Medhurst <tixy@linaro.org>
Acked-by: Jon Medhurst <tixy@linaro.org>
Tested-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index dd183ce..c78c966 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -43,7 +43,7 @@
u16 rev;
u8 current_page;
int dpms;
- bool is_hdmi_sink;
+ bool supports_infoframes;
u8 vip_cntrl_0;
u8 vip_cntrl_1;
u8 vip_cntrl_2;
@@ -1068,8 +1068,20 @@
priv->tmds_clock = adjusted_mode->clock;
- /* Only setup the info frames if the sink is HDMI */
- if (priv->is_hdmi_sink) {
+ /* CEA-861B section 6 says that:
+ * CEA version 1 (CEA-861) has no support for infoframes.
+ * CEA version 2 (CEA-861A) supports version 1 AVI infoframes,
+ * and optional basic audio.
+ * CEA version 3 (CEA-861B) supports version 1 and 2 AVI infoframes,
+ * and optional digital audio, with audio infoframes.
+ *
+ * Since we only support generation of version 2 AVI infoframes,
+ * ignore CEA version 2 and below (iow, behave as if we're a
+ * CEA-861 source.)
+ */
+ priv->supports_infoframes = priv->connector.display_info.cea_rev >= 3;
+
+ if (priv->supports_infoframes) {
/* We need to turn HDMI HDCP stuff on to get audio through */
reg &= ~TBG_CNTRL_1_DWIN_DIS;
reg_write(priv, REG_TBG_CNTRL_1, reg);
@@ -1180,7 +1192,6 @@
drm_mode_connector_update_edid_property(connector, edid);
n = drm_add_edid_modes(connector, edid);
- priv->is_hdmi_sink = drm_detect_hdmi_monitor(edid);
drm_edid_to_eld(connector, edid);
kfree(edid);
@@ -1263,7 +1274,10 @@
}
mutex_lock(&priv->audio_mutex);
- ret = tda998x_configure_audio(priv, &audio);
+ if (priv->supports_infoframes)
+ ret = tda998x_configure_audio(priv, &audio);
+ else
+ ret = 0;
if (ret == 0)
priv->audio_params = audio;