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Subject[PATCH alsa-lib v4 1/4] ASoC: topology: Fix bclk and fsync inversion in set_link_hw_format()
Date
The values of bclk and fsync are inverted WRT the codec. But the existing
solution already works for Broadwell, see the alsa-lib config:

`alsa-lib/src/conf/topology/broadwell/broadwell.conf`

This commit provides the backwards-compatible solution to fix this misuse.
This commit goes in pair with the corresponding patch for linux.

Signed-off-by: Kirill Marinushkin <k.marinushkin@gmail.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Tested-by: Pan Xiuli <xiuli.pan@linux.intel.com>
Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Mark Brown <broonie@kernel.org>
Cc: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Cc: linux-kernel@vger.kernel.org
Cc: alsa-devel@alsa-project.org
---
include/sound/asoc.h | 16 ++++++++++++++--
include/topology.h | 4 ++--
src/conf/topology/broadwell/broadwell.conf | 4 ++--
src/topology/pcm.c | 30 ++++++++++++++++++++++++++----
4 files changed, 44 insertions(+), 10 deletions(-)

diff --git a/include/sound/asoc.h b/include/sound/asoc.h
index 0f5d9f9a..89b00703 100644
--- a/include/sound/asoc.h
+++ b/include/sound/asoc.h
@@ -156,6 +156,18 @@
#define SND_SOC_TPLG_LNK_FLGBIT_SYMMETRIC_SAMPLEBITS (1 << 2)
#define SND_SOC_TPLG_LNK_FLGBIT_VOICE_WAKEUP (1 << 3)

+/* DAI topology BCLK parameter
+ * For the backwards capability, by default codec is bclk master
+ */
+#define SND_SOC_TPLG_BCLK_CM 0 /* codec is bclk master */
+#define SND_SOC_TPLG_BCLK_CS 1 /* codec is bclk slave */
+
+/* DAI topology FSYNC parameter
+ * For the backwards capability, by default codec is fsync master
+ */
+#define SND_SOC_TPLG_FSYNC_CM 0 /* codec is fsync master */
+#define SND_SOC_TPLG_FSYNC_CS 1 /* codec is fsync slave */
+
/*
* Block Header.
* This header precedes all object and object arrays below.
@@ -311,8 +323,8 @@ struct snd_soc_tplg_hw_config {
__u8 clock_gated; /* 1 if clock can be gated to save power */
__u8 invert_bclk; /* 1 for inverted BCLK, 0 for normal */
__u8 invert_fsync; /* 1 for inverted frame clock, 0 for normal */
- __u8 bclk_master; /* 1 for master of BCLK, 0 for slave */
- __u8 fsync_master; /* 1 for master of FSYNC, 0 for slave */
+ __u8 bclk_master; /* SND_SOC_TPLG_BCLK_ value */
+ __u8 fsync_master; /* SND_SOC_TPLG_FSYNC_ value */
__u8 mclk_direction; /* 0 for input, 1 for output */
__le16 reserved; /* for 32bit alignment */
__le32 mclk_rate; /* MCLK or SYSCLK freqency in Hz */
diff --git a/include/topology.h b/include/topology.h
index 8779da4d..5d7b46df 100644
--- a/include/topology.h
+++ b/include/topology.h
@@ -1000,8 +1000,8 @@ struct snd_tplg_hw_config_template {
unsigned char clock_gated; /* 1 if clock can be gated to save power */
unsigned char invert_bclk; /* 1 for inverted BCLK, 0 for normal */
unsigned char invert_fsync; /* 1 for inverted frame clock, 0 for normal */
- unsigned char bclk_master; /* 1 for master of BCLK, 0 for slave */
- unsigned char fsync_master; /* 1 for master of FSYNC, 0 for slave */
+ unsigned char bclk_master; /* SND_SOC_TPLG_BCLK_ value */
+ unsigned char fsync_master; /* SND_SOC_TPLG_FSYNC_ value */
unsigned char mclk_direction; /* 0 for input, 1 for output */
unsigned short reserved; /* for 32bit alignment */
unsigned int mclk_rate; /* MCLK or SYSCLK freqency in Hz */
diff --git a/src/conf/topology/broadwell/broadwell.conf b/src/conf/topology/broadwell/broadwell.conf
index b8405d93..09fc4daa 100644
--- a/src/conf/topology/broadwell/broadwell.conf
+++ b/src/conf/topology/broadwell/broadwell.conf
@@ -393,8 +393,8 @@ SectionGraph."dsp" {
SectionHWConfig."CodecHWConfig" {
id "1"
format "I2S" # physical audio format.
- bclk "master" # Platform is master of bit clock
- fsync "master" # platform is master of fsync
+ bclk "codec_slave" # platform is master of bit clock (codec is slave)
+ fsync "codec_slave" # platform is master of fsync (codec is slave)
}

SectionLink."Codec" {
diff --git a/src/topology/pcm.c b/src/topology/pcm.c
index bb47b9af..d0395182 100644
--- a/src/topology/pcm.c
+++ b/src/topology/pcm.c
@@ -1141,8 +1141,19 @@ int tplg_parse_hw_config(snd_tplg_t *tplg, snd_config_t *cfg,
if (snd_config_get_string(n, &val) < 0)
return -EINVAL;

- if (!strcmp(val, "master"))
- hw_cfg->bclk_master = true;
+ if (!strcmp(val, "master")) {
+ /* For backwards capability,
+ * "master" == "codec is slave"
+ */
+ SNDERR("warning: deprecated bclk value '%s'\n",
+ val);
+
+ hw_cfg->bclk_master = SND_SOC_TPLG_BCLK_CS;
+ } else if (!strcmp(val, "codec_slave")) {
+ hw_cfg->bclk_master = SND_SOC_TPLG_BCLK_CS;
+ } else if (!strcmp(val, "codec_master")) {
+ hw_cfg->bclk_master = SND_SOC_TPLG_BCLK_CM;
+ }
continue;
}

@@ -1167,8 +1178,19 @@ int tplg_parse_hw_config(snd_tplg_t *tplg, snd_config_t *cfg,
if (snd_config_get_string(n, &val) < 0)
return -EINVAL;

- if (!strcmp(val, "master"))
- hw_cfg->fsync_master = true;
+ if (!strcmp(val, "master")) {
+ /* For backwards capability,
+ * "master" == "codec is slave"
+ */
+ SNDERR("warning: deprecated fsync value '%s'\n",
+ val);
+
+ hw_cfg->fsync_master = SND_SOC_TPLG_FSYNC_CS;
+ } else if (!strcmp(val, "codec_slave")) {
+ hw_cfg->fsync_master = SND_SOC_TPLG_FSYNC_CS;
+ } else if (!strcmp(val, "codec_master")) {
+ hw_cfg->fsync_master = SND_SOC_TPLG_FSYNC_CM;
+ }
continue;
}

--
2.13.6
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