[PATCH v2] ASoC: Intel: kbl_rt5663_rt5514_max98927: Add dmic format constraint

[PATCH v2] ASoC: Intel: kbl_rt5663_rt5514_max98927: Add dmic format constraint

[Yu-Hsuan Hsu]

On KBL platform, the microphone is attached to external codec(rt5514)
instead of PCH. However, TDM slot between PCH and codec is 16 bits only.
In order to avoid setting wrong format, we should add a constraint to
force to use 16 bits format forever.

Signed-off-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
---
I have updated the commit message. Please see whether it is clear
enough. Thanks.
 sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
index 74dda8784f1a01..67b276a65a8d2d 100644
--- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
@@ -400,6 +400,9 @@ static int kabylake_dmic_startup(struct snd_pcm_substream *substream)
 	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 			dmic_constraints);
 
+	runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
+	snd_pcm_hw_constraint_msbits(runtime, 0, 16, 16);
+
 	return snd_pcm_hw_constraint_list(substream->runtime, 0,
 			SNDRV_PCM_HW_PARAM_RATE, &constraints_rates);
 }
-- 
2.23.0.351.gc4317032e6-goog

Re: [PATCH v2] ASoC: Intel: kbl_rt5663_rt5514_max98927: Add dmic format constraint

[Yu-Hsuan Hsu]

Hi all,

Does anyone have time to review this patch? It should be easy to
review because it just a format constraint.

Thanks,
Yu-Hsuan

Yu-Hsuan Hsu <yuhsuan@chromium.org> 於 2019年9月24日 週二 上午12:29寫道：
>
> On KBL platform, the microphone is attached to external codec(rt5514)
> instead of PCH. However, TDM slot between PCH and codec is 16 bits only.
> In order to avoid setting wrong format, we should add a constraint to
> force to use 16 bits format forever.
>
> Signed-off-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
> ---
> I have updated the commit message. Please see whether it is clear
> enough. Thanks.
>  sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> index 74dda8784f1a01..67b276a65a8d2d 100644
> --- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> +++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> @@ -400,6 +400,9 @@ static int kabylake_dmic_startup(struct snd_pcm_substream *substream)
>         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
>                         dmic_constraints);
>
> +       runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
> +       snd_pcm_hw_constraint_msbits(runtime, 0, 16, 16);
> +
>         return snd_pcm_hw_constraint_list(substream->runtime, 0,
>                         SNDRV_PCM_HW_PARAM_RATE, &constraints_rates);
>  }
> --
> 2.23.0.351.gc4317032e6-goog
>

Re: [alsa-devel] [PATCH v2] ASoC: Intel: kbl_rt5663_rt5514_max98927: Add dmic format constraint

[Pierre-Louis Bossart]

On 9/23/19 11:29 AM, Yu-Hsuan Hsu wrote:
> On KBL platform, the microphone is attached to external codec(rt5514)
> instead of PCH. However, TDM slot between PCH and codec is 16 bits only.
> In order to avoid setting wrong format, we should add a constraint to
> force to use 16 bits format forever.
> 
> Signed-off-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
> ---
> I have updated the commit message. Please see whether it is clear
> enough. Thanks.

Sorry, I missed this patch. Looks ok, though the 'right' approach would 
be to have topology and/or copiers deal with format changes.

Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>


>   sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> index 74dda8784f1a01..67b276a65a8d2d 100644
> --- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> +++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> @@ -400,6 +400,9 @@ static int kabylake_dmic_startup(struct snd_pcm_substream *substream)
>   	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
>   			dmic_constraints);
>   
> +	runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
> +	snd_pcm_hw_constraint_msbits(runtime, 0, 16, 16);
> +
>   	return snd_pcm_hw_constraint_list(substream->runtime, 0,
>   			SNDRV_PCM_HW_PARAM_RATE, &constraints_rates);
>   }
>