[alsa-devel] [PATCH v2 2/2] ASoC: topology: Add missing clock gating parameter when parsing hw_configs

[Kirill Marinushkin]

Clock gating parameter is a part of `dai_fmt`. It is supported by
`alsa-lib` when creating a topology binary file, but ignored by kernel
when loading this topology file.

After applying this commit, the clock gating parameter is not ignored any
more. The old behaviour is not broken, as by default the parameter value
is 0.

For example, the following config, based on
alsa-lib/src/conf/topology/broadwell/broadwell.conf, is now supported:

~~~~
SectionHWConfig."CodecHWConfig" {
        id "1"
        format "I2S"            # physical audio format.
        bclk   "master"         # Platform is master of bit clock
        fsync  "master"         # platform is master of fsync
        pm_gate_clocks "true"   # clock can be gated
}

SectionLink."Codec" {

        # used for binding to the physical link
        id "0"

        hw_configs [
                "CodecHWConfig"
        ]

        default_hw_conf_id "1"
}
~~~~

Signed-off-by: Kirill Marinushkin <k.marinushkin at gmail.com>
Cc: Takashi Sakamoto <o-takashi at sakamocchi.jp>
Cc: Liam Girdwood <lgirdwood at gmail.com>
Cc: Mark Brown <broonie at kernel.org>
Cc: Jaroslav Kysela <perex at perex.cz>
Cc: Takashi Iwai <tiwai at suse.com>
Cc: alsa-devel at alsa-project.org
Cc: linux-kernel at vger.kernel.org
---
 sound/soc/soc-topology.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 01a50413c66f..bac70676a6b4 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -1981,6 +1981,13 @@ static void set_link_hw_format(struct snd_soc_dai_link *link,
 
 		link->dai_fmt = hw_config->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
 
+		/* clock gating */
+		if (hw_config->clock_gated == SND_SOC_TPLG_DAI_CLK_GATE_GATED)
+			link->dai_fmt |= SND_SOC_DAIFMT_GATED;
+		else if (hw_config->clock_gated ==
+			 SND_SOC_TPLG_DAI_CLK_GATE_CONT)
+			link->dai_fmt |= SND_SOC_DAIFMT_CONT;
+
 		/* clock signal polarity */
 		invert_bclk = hw_config->invert_bclk;
 		invert_fsync = hw_config->invert_fsync;
-- 
2.13.6