ASoC: audio-graph-card: don't select DPCM via audio-graph-card

commit ae3cb5790906b ("ASoC: audio-graph-card: merge
audio-graph-scu-card") merged audio-graph-scu-card which can
handle DPCM into audio-graph-card.

By this patch, the judgement to select "normal sound card" or
"DPCM sound card" is based on its OF-graph endpoint connection.
But, because of it, existing "audio-graph-card" user who is
assuming "normal sound card" might select DPCM unintentionally.

To solve this issue, this patch allows "audio-graph-card" user
can select "normal sound card", and "audio-graph-scu-card" user
can select both "normal sound card" and "DPCM sound card".
This keeps compatibility collectry.

Fixes: ae3cb5790906b ("ASoC: audio-graph-card: merge audio-graph-scu-card")
Reported-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
index bb12351330e8..69bc4848d787 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -20,6 +20,8 @@
 #include <linux/string.h>
 #include <sound/simple_card_utils.h>
 
+#define DPCM_SELECTABLE 1
+
 struct graph_priv {
         struct snd_soc_card snd_card;
         struct graph_dai_props {
@@ -440,6 +442,7 @@ static int graph_for_each_link(struct graph_priv *priv,
         struct device_node *codec_port;
         struct device_node *codec_port_old = NULL;
         struct asoc_simple_card_data adata;
+        uintptr_t dpcm_selectable = (uintptr_t)of_device_get_match_data(dev);
         int rc, ret;
 
         /* loop for all listed CPU port */
@@ -470,8 +473,9 @@ static int graph_for_each_link(struct graph_priv *priv,
                          * if Codec port has many endpoints,
                          * or has convert-xxx property
                          */
-                        if ((of_get_child_count(codec_port) > 1) ||
-                            adata.convert_rate || adata.convert_channels)
+                        if (dpcm_selectable &&
+                            ((of_get_child_count(codec_port) > 1) ||
+                             adata.convert_rate || adata.convert_channels))
                                 ret = func_dpcm(priv, cpu_ep, codec_ep, li,
                                                 (codec_port_old == codec_port));
                         /* else normal sound */
@@ -732,7 +736,8 @@ static int graph_remove(struct platform_device *pdev)
 
 static const struct of_device_id graph_of_match[] = {
         { .compatible = "audio-graph-card", },
-        { .compatible = "audio-graph-scu-card", },
+        { .compatible = "audio-graph-scu-card",
+          .data = (void *)DPCM_SELECTABLE },
         {},
 };
 MODULE_DEVICE_TABLE(of, graph_of_match);