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From:   Jerome Brunet <jbrunet@baylibre.com>
To:     Mark Brown <broonie@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>
Cc:     Jerome Brunet <jbrunet@baylibre.com>, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org,
        Kevin Hilman <khilman@baylibre.com>, zhangn1985@outlook.com
Subject: [PATCH] ASoC: meson: cards: deal dpcm flag change
Date:   Fri, 31 Jul 2020 14:06:03 +0200
Message-Id: <20200731120603.2243261-1-jbrunet@baylibre.com>
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Commit b73287f0b074 ("ASoC: soc-pcm: dpcm: fix playback/capture checks")
changed the meaning of dpcm_playback/dpcm_capture and now requires the
CPU DAI BE to aligned with those flags.

This broke all Amlogic cards with uni-directional backends (All gx and
most axg cards).

While I'm still confused as to how this change is an improvement, those
cards can't remain broken forever. Hopefully, next time an API change is
done like that, all the users will be updated as part of the change, and
not left to fend for themselves.

Fixes: b73287f0b074 ("ASoC: soc-pcm: dpcm: fix playback/capture checks")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---

 Hi,

 For the cards be actually fixed, change 'ASoC: core: use less strict tests for dailink capabilities'
 will need to merged as well. snd_soc_dai_link_set_capabilities() as
 implemented in 25612477d20b5 ('ASoC: soc-dai: set dai_link dpcm_ flags with a helper')
 does not support link with multiple codec with different direction
 capabilities. This quite a common case on these cards.

 sound/soc/meson/axg-card.c         | 18 ++++++++++--------
 sound/soc/meson/gx-card.c          | 18 +++++++++---------
 sound/soc/meson/meson-card-utils.c |  4 ----
 3 files changed, 19 insertions(+), 21 deletions(-)

diff --git a/sound/soc/meson/axg-card.c b/sound/soc/meson/axg-card.c
index 5176be165210..2b77010c2c5c 100644
--- a/sound/soc/meson/axg-card.c
+++ b/sound/soc/meson/axg-card.c
@@ -327,20 +327,22 @@ static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
 		return ret;
 
 	if (axg_card_cpu_is_playback_fe(dai_link->cpus->of_node))
-		ret = meson_card_set_fe_link(card, dai_link, np, true);
+		return meson_card_set_fe_link(card, dai_link, np, true);
 	else if (axg_card_cpu_is_capture_fe(dai_link->cpus->of_node))
-		ret = meson_card_set_fe_link(card, dai_link, np, false);
-	else
-		ret = meson_card_set_be_link(card, dai_link, np);
+		return meson_card_set_fe_link(card, dai_link, np, false);
 
+
+	ret = meson_card_set_be_link(card, dai_link, np);
 	if (ret)
 		return ret;
 
-	if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node))
-		ret = axg_card_parse_tdm(card, np, index);
-	else if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
+	if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
 		dai_link->params = &codec_params;
-		dai_link->no_pcm = 0; /* link is not a DPCM BE */
+	} else {
+		dai_link->no_pcm = 1;
+		snd_soc_dai_link_set_capabilities(dai_link);
+		if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node))
+			ret = axg_card_parse_tdm(card, np, index);
 	}
 
 	return ret;
diff --git a/sound/soc/meson/gx-card.c b/sound/soc/meson/gx-card.c
index 6da8535f4dd2..5119434a81c4 100644
--- a/sound/soc/meson/gx-card.c
+++ b/sound/soc/meson/gx-card.c
@@ -96,21 +96,21 @@ static int gx_card_add_link(struct snd_soc_card *card, struct device_node *np,
 		return ret;
 
 	if (gx_card_cpu_identify(dai_link->cpus, "FIFO"))
-		ret = meson_card_set_fe_link(card, dai_link, np, true);
-	else
-		ret = meson_card_set_be_link(card, dai_link, np);
+		return  meson_card_set_fe_link(card, dai_link, np, true);
 
+	ret = meson_card_set_be_link(card, dai_link, np);
 	if (ret)
 		return ret;
 
-	/* Check if the cpu is the i2s encoder and parse i2s data */
-	if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))
-		ret = gx_card_parse_i2s(card, np, index);
-
 	/* Or apply codec to codec params if necessary */
-	else if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {
+	if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {
 		dai_link->params = &codec_params;
-		dai_link->no_pcm = 0; /* link is not a DPCM BE */
+	} else {
+		dai_link->no_pcm = 1;
+		snd_soc_dai_link_set_capabilities(dai_link);
+		/* Check if the cpu is the i2s encoder and parse i2s data */
+		if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))
+			ret = gx_card_parse_i2s(card, np, index);
 	}
 
 	return ret;
diff --git a/sound/soc/meson/meson-card-utils.c b/sound/soc/meson/meson-card-utils.c
index f9ce03f3921f..6a64ac01b5ca 100644
--- a/sound/soc/meson/meson-card-utils.c
+++ b/sound/soc/meson/meson-card-utils.c
@@ -147,10 +147,6 @@ int meson_card_set_be_link(struct snd_soc_card *card,
 	struct device_node *np;
 	int ret, num_codecs;
 
-	link->no_pcm = 1;
-	link->dpcm_playback = 1;
-	link->dpcm_capture = 1;
-
 	num_codecs = of_get_child_count(node);
 	if (!num_codecs) {
 		dev_err(card->dev, "be link %s has no codec\n",
-- 
2.25.4