diff options
| author | Maruthi Srinivas Bayyavarapu <Maruthi.Bayyavarapu@amd.com> | 2015-10-23 17:15:41 -0400 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-10-24 06:29:38 +0900 |
| commit | ab57b8e90c658a72944c48a81a1352e61e84db02 (patch) | |
| tree | 3e425eb46f1fe598c204bcca88a98d08c713ad9d /sound/soc/dwc/designware_i2s.c | |
| parent | 1d957d862ac782eaf5803d4d4cf167708e4dc147 (diff) | |
ASoC: dwc: add check for master/slave format
DW i2s controller's master/slave config can be read from a
read-only register. Machine driver can try to set a master/slave
format on cpu-dai using 'set_fmt' of dai ops. A check is added to
verify codec is master when dwc is slave and vice-versa.
Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/dwc/designware_i2s.c')
| -rw-r--r-- | sound/soc/dwc/designware_i2s.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c index 3a52f82b5523..f427325ae448 100644 --- a/sound/soc/dwc/designware_i2s.c +++ b/sound/soc/dwc/designware_i2s.c @@ -341,12 +341,43 @@ static int dw_i2s_trigger(struct snd_pcm_substream *substream, return ret; } +static int dw_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) +{ + struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai); + int ret = 0; + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + if (dev->capability & DW_I2S_SLAVE) + ret = 0; + else + ret = -EINVAL; + break; + case SND_SOC_DAIFMT_CBS_CFS: + if (dev->capability & DW_I2S_MASTER) + ret = 0; + else + ret = -EINVAL; + break; + case SND_SOC_DAIFMT_CBM_CFS: + case SND_SOC_DAIFMT_CBS_CFM: + ret = -EINVAL; + break; + default: + dev_dbg(dev->dev, "dwc : Invalid master/slave format\n"); + ret = -EINVAL; + break; + } + return ret; +} + static struct snd_soc_dai_ops dw_i2s_dai_ops = { .startup = dw_i2s_startup, .shutdown = dw_i2s_shutdown, .hw_params = dw_i2s_hw_params, .prepare = dw_i2s_prepare, .trigger = dw_i2s_trigger, + .set_fmt = dw_i2s_set_fmt, }; static const struct snd_soc_component_driver dw_i2s_component = { |