[alsa-devel] Async ops SOC compress issue

[b_lkasam at codeaurora.org]

On 2019-01-29 12:55, b_lkasam at codeaurora.org wrote:
> Hi ALSA team,
> Need inputs wrt one issue seen with soc-compress code.
> 
> Please help check below issue seen in soc-compress file wrt handling
> multiple BEs
> with async ops ASYNC_DPCM_SND_SOC_HW_PARAMS set for given FE
> dailink/BE dailinks also.
> 
> Issue :
> pcm_prepare failure when 2 BE's on same FE enabled during compress 
> playback,
> seen only when both BE's have SOC_HW_PARAM defined as an async_op.
> 
> Analysis:
> - With SOC_HW_PARAMS defined as async_op on both BE's,
> hw_params api for both of these BE's are scheduled for asynchronous 
> execution.
> 
> - It is observed that dpcm_be_hw_params_prepare is getting invoked
> twice, but for the same BE.
> 
> Below are the issue logs taken for above scenario.
> 
> 12-21 16:38:32.074     0     0 D SDM660 Compress1: connected new DPCM
> playback path SDM660 Compress1 -> INT4_MI2S_RX
> 12-21 16:38:32.075     0     0 D SDM660 Compress1: connected new DPCM
> playback path SDM660 Compress1 -> INT0_MI2S_RX
> 
> 12-21 16:38:32.075     0     0 D INT0_MI2S_RX: ASoC: open playback BE
> INT0_MI2S_RX
> 12-21 16:38:32.076     0     0 D INT4_MI2S_RX: ASoC: open playback BE
> INT4_MI2S_RX
> 
> 12-21 16:38:32.077     0     0 E soc_compr_set_params_fe: : async
> schedule hw_params for be INT0_MI2S_RX
> 12-21 16:38:32.077     0     0 E soc_compr_set_params_fe: : async
> schedule hw_params for be INT4_MI2S_RX
> 
> 12-21 16:38:32.078     0     0 E dpcm_be_hw_params_prepare: : BE
> INT4_MI2S_RX -> dpcm_fe_dai_hw_params_be
> 12-21 16:38:32.079     0     0 E msm-dai-q6-mi2s soc:
> qcom,msm-dai-mi2s:qcom,msm-dai-q6-int-mi2s4:
> msm_dai_q6_mi2s_hw_params: dai id 11 dai_data->channels = 1
> 
> 12-21 16:38:32.143     0     0 E dpcm_be_hw_params_prepare: : BE
> INT4_MI2S_RX -> dpcm_fe_dai_hw_params_be
> 12-21 16:38:32.173     0     0 E msm-dai-q6-mi2s soc:
> qcom,msm-dai-mi2s:qcom,msm-dai-q6-int-mi2s4:
> msm_dai_q6_mi2s_hw_params: ERROR    dai id 11 dai_data->channels = 1
> 
> It is not clear why dpcm_be_hw_params_prepare is happening for same BE
> twice even though async schedule was done for both.
> 
> - With async_synchronize call after scheduling of hw_param, the
> behavior is as expected.
> hw_param for both BE's are success.
> 
> 
> diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c
> index ad3cc68..b0a1995 100644
> --- a/sound/soc/soc-compress.c
> +++ b/sound/soc/soc-compress.c
> @@ -535,6 +535,7 @@ static int soc_compr_set_params_fe(struct
> snd_compr_stream *cstream,
>                                 }
>                         }
>                 }
> +               async_synchronize_full_domain(&async_domain); - Adding
> this code fixing the issue, but looks not correct way, please suggest
>                 for (i = 0; i < j; i++) {
>                         cstream->be = be_list[i];
>                         dpcm_be_hw_params_prepare(cstream);
> 
> 
> 
> With regards
> Laxminath Kasam

HI ALSA team,
can you please help update on above query wrt soc compress issue.

Thanks
Laxminath Kasam