@@ -135,6 +135,11 @@
#define SND_SOC_TPLG_DAI_FLGBIT_SYMMETRIC_CHANNELS (1 << 1)
#define SND_SOC_TPLG_DAI_FLGBIT_SYMMETRIC_SAMPLEBITS (1 << 2)
+/* DAI clock gating */
+#define SND_SOC_TPLG_DAI_CLK_GATE_UNDEFINED 0
+#define SND_SOC_TPLG_DAI_CLK_GATE_GATED 1
+#define SND_SOC_TPLG_DAI_CLK_GATE_CONT 2
+
/* DAI physical PCM data formats.
* Add new formats to the end of the list.
*/
@@ -320,7 +325,7 @@ struct snd_soc_tplg_hw_config {
__le32 size; /* in bytes of this structure */
__le32 id; /* unique ID - - used to match */
__le32 fmt; /* SND_SOC_DAI_FORMAT_ format value */
- __u8 clock_gated; /* 1 if clock can be gated to save power */
+ __u8 clock_gated; /* SND_SOC_TPLG_DAI_CLK_GATE_ value */
__u8 invert_bclk; /* 1 for inverted BCLK, 0 for normal */
__u8 invert_fsync; /* 1 for inverted frame clock, 0 for normal */
__u8 bclk_master; /* SND_SOC_TPLG_BCLK_ value */
@@ -997,7 +997,7 @@ struct snd_tplg_pcm_template {
struct snd_tplg_hw_config_template {
int id; /* unique ID - - used to match */
unsigned int fmt; /* SND_SOC_DAI_FORMAT_ format value */
- unsigned char clock_gated; /* 1 if clock can be gated to save power */
+ unsigned char clock_gated; /* SND_SOC_TPLG_DAI_CLK_GATE_ value */
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; /* SND_SOC_TPLG_BCLK_ value */
@@ -1233,7 +1233,11 @@ int tplg_parse_hw_config(snd_tplg_t *tplg, snd_config_t *cfg,
return -EINVAL;
if (!strcmp(val, "true"))
- hw_cfg->clock_gated = true;
+ hw_cfg->clock_gated =
+ SND_SOC_TPLG_DAI_CLK_GATE_GATED;
+ else
+ hw_cfg->clock_gated =
+ SND_SOC_TPLG_DAI_CLK_GATE_CONT;
continue;
}
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. This solution is backwards compatible. The existing behaviour is not broken, because by default the parameter value is 0 and is ignored. snd_soc_tplg_hw_config.clock_gated = 0 => no effect snd_soc_tplg_hw_config.clock_gated = 1 => SND_SOC_DAIFMT_GATED snd_soc_tplg_hw_config.clock_gated = 2 => SND_SOC_DAIFMT_CONT 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. 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@gmail.com> Reviewed-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: Pan Xiuli <xiuli.pan@linux.intel.com> 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 | 7 ++++++- include/topology.h | 2 +- src/topology/pcm.c | 6 +++++- 3 files changed, 12 insertions(+), 3 deletions(-)