ASoC: rsnd: add HDMI output support

Renesas R-Car Gen3 can output HDMI sound if SSIU/SSI are connected to
R-Car built-in HDMI device (R-Car Gen3 built-in HDMI device will be
controlled by DRM/KMS driver).
If SSIx was connected to HDMI0/1 on DT, SSI driver will detect it
automatically by this patch.
Note is that now Renesas R-Car sound driver is assuming that it is
using OF-graph base simple card for HDMI sound.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 135c566..d0602c1 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -11,6 +11,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+#include <sound/simple_card_utils.h>
 #include <linux/delay.h>
 #include "rsnd.h"
 #define RSND_SSI_NAME_SIZE 16
@@ -81,6 +82,8 @@ struct rsnd_ssi {
 /* flags */
 #define RSND_SSI_CLK_PIN_SHARE		(1 << 0)
 #define RSND_SSI_NO_BUSIF		(1 << 1) /* SSI+DMA without BUSIF */
+#define RSND_SSI_HDMI0			(1 << 2) /* for HDMI0 */
+#define RSND_SSI_HDMI1			(1 << 3) /* for HDMI1 */
 
 #define for_each_rsnd_ssi(pos, priv, i)					\
 	for (i = 0;							\
@@ -99,6 +102,20 @@ struct rsnd_ssi {
 #define rsnd_ssi_is_run_mods(mod, io) \
 	(rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
 
+int rsnd_ssi_hdmi_port(struct rsnd_dai_stream *io)
+{
+	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
+	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
+
+	if (rsnd_ssi_mode_flags(ssi) & RSND_SSI_HDMI0)
+		return RSND_SSI_HDMI_PORT0;
+
+	if (rsnd_ssi_mode_flags(ssi) & RSND_SSI_HDMI1)
+		return RSND_SSI_HDMI_PORT1;
+
+	return 0;
+}
+
 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 {
 	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
@@ -835,6 +852,47 @@ void rsnd_parse_connect_ssi(struct rsnd_dai *rdai,
 	of_node_put(node);
 }
 
+static void __rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv,
+					     struct rsnd_dai_stream *io,
+					     struct device_node *remote_ep)
+{
+	struct device *dev = rsnd_priv_to_dev(priv);
+	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
+	struct rsnd_ssi *ssi;
+
+	if (!mod)
+		return;
+
+	ssi  = rsnd_mod_to_ssi(mod);
+
+	if (strstr(remote_ep->full_name, "hdmi0")) {
+		ssi->flags |= RSND_SSI_HDMI0;
+		dev_dbg(dev, "%s[%d] connected to HDMI0\n",
+			 rsnd_mod_name(mod), rsnd_mod_id(mod));
+	}
+
+	if (strstr(remote_ep->full_name, "hdmi1")) {
+		ssi->flags |= RSND_SSI_HDMI1;
+		dev_dbg(dev, "%s[%d] connected to HDMI1\n",
+			rsnd_mod_name(mod), rsnd_mod_id(mod));
+	}
+}
+
+void rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv,
+				    struct device_node *endpoint,
+				    int dai_i)
+{
+	struct rsnd_dai *rdai = rsnd_rdai_get(priv, dai_i);
+	struct device_node *remote_ep;
+
+	remote_ep = of_graph_get_remote_endpoint(endpoint);
+	if (!remote_ep)
+		return;
+
+	__rsnd_ssi_parse_hdmi_connection(priv, &rdai->playback, remote_ep);
+	__rsnd_ssi_parse_hdmi_connection(priv, &rdai->capture,  remote_ep);
+}
+
 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
 {
 	if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv)))