[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <91a1fb3d-b2a3-e40e-8f87-08768b9da1bd@linux.intel.com>
Date: Mon, 7 Aug 2017 14:36:04 +0800
From: Keyon Jie <yang.jie@...ux.intel.com>
To: Cheng-yi Chiang <cychiang@...omium.org>
Cc: alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
Vinod Koul <vinod.koul@...el.com>,
linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
Mark Brown <broonie@...nel.org>,
Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
"U . Artie Eoff" <ullysses.a.eoff@...el.com>
Subject: Re: [alsa-devel] [PATCH v2] ASoC: Intel: Reset hw_ptr on resume
trigger
On 2017年08月03日 21:47, Cheng-yi Chiang wrote:
> +Jarkko Nikula
>
> Hi Keyon,
> Sorry for the late reply. I spent some time trying to figure out
> previous suspend resume patch in BYT.
>
> From the patch for restore_stream flag:
> https://patchwork.kernel.org/patch/4706611/, the restore_stream flag
> means that ADSP was in power off state during system suspend/resume
> cycle. You are right that the resuming won't play from the pausing
> point of the last suspending. I am not sure whether it is intended in
> ADSP coming back from power off case. Jarkko and Ullysses might have
> better idea on this.
>
> In my testing I have found that this patch sometimes causes playback
> failure upon resume. I have put the logs in
> https://bugs.chromium.org/p/chromium/issues/detail?id=752107. I think
> we should not merge this until it is resolved. I have cc'ed Intel
> folks on the issue.
Thanks for investigation on it, so looks it's better to root cause and
fix this noise issue, other than workaround to reset pcm_data->hw_ptr
which may introduce new issues.
Thanks,
~Keyon
>
> Thanks!
>
> On Tue, Aug 1, 2017 at 1:04 PM, Keyon Jie <yang.jie@...ux.intel.com> wrote:
>>
>> On 2017年08月01日 11:30, Vinod Koul wrote:
>>>
>>> On Mon, Jul 31, 2017 at 06:47:34PM +0800, Cheng-Yi Chiang wrote:
>>>>
>>>> From: "U. Artie Eoff" <ullysses.a.eoff@...el.com>
>>>>
>>>> Reset the hw_ptr before queuing the restore_stream_context
>>>> work to eradicate a nasty white audio noise on resume.
>>>
>>>
>>> Liam, Jie? This on legacy BYT driver..
>>>
>>>>
>>>> Tested-by: Cheng-Yi Chiang <cychiang@...omium.org>
>>>> Signed-off-by: U. Artie Eoff <ullysses.a.eoff@...el.com>
>>>> Signed-off-by: Cheng-Yi Chiang <cychiang@...omium.org>
>>>> ---
>>>> sound/soc/intel/baytrail/sst-baytrail-pcm.c | 4 +++-
>>>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/sound/soc/intel/baytrail/sst-baytrail-pcm.c
>>>> b/sound/soc/intel/baytrail/sst-baytrail-pcm.c
>>>> index 4765ad474544..e0db7070cd42 100644
>>>> --- a/sound/soc/intel/baytrail/sst-baytrail-pcm.c
>>>> +++ b/sound/soc/intel/baytrail/sst-baytrail-pcm.c
>>>> @@ -187,8 +187,10 @@ static int sst_byt_pcm_trigger(struct
>>>> snd_pcm_substream *substream, int cmd)
>>>> sst_byt_stream_start(byt, pcm_data->stream, 0);
>>>> break;
>>>> case SNDRV_PCM_TRIGGER_RESUME:
>>>> - if (pdata->restore_stream == true)
>>>> + if (pdata->restore_stream == true) {
>>>> + pcm_data->hw_ptr = 0;
>>
>>
>> Won't this break the hw_ptr and make the resuming won't play from the
>> pausing point of the last suspending?
>>
>> Thanks,
>> ~Keyon
>>
>>
>>>> schedule_work(&pcm_data->work);
>>>> + }
>>>> else
>>>> sst_byt_stream_resume(byt, pcm_data->stream);
>>>> break;
>>>> --
>>>> 2.12.2
>>>>
>>>
>>
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@...a-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>
Powered by blists - more mailing lists