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Message-Id: <1703669263-13832-1-git-send-email-shengjiu.wang@nxp.com> Date: Wed, 27 Dec 2023 17:27:43 +0800 From: Shengjiu Wang <shengjiu.wang@....com> To: pierre-louis.bossart@...ux.intel.com, lgirdwood@...il.com, peter.ujfalusi@...ux.intel.com, yung-chuan.liao@...ux.intel.com, ranjani.sridharan@...ux.intel.com, daniel.baluta@....com, kai.vehmanen@...ux.intel.com, broonie@...nel.org, perex@...ex.cz, tiwai@...e.com, shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, linux-imx@....com, sound-open-firmware@...a-project.org, linux-sound@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, shengjiu.wang@...il.com Subject: [PATCH] ASoC: SOF: imx: Add SNDRV_PCM_INFO_BATCH flag The sof imx pcm device is a device which should support double buffering. Found this issue with pipewire. When there is no SNDRV_PCM_INFO_BATCH flag in driver, the pipewire will set headroom to be zero, and because sof pcm device don't support residue report, when the latency setting is small, the "delay" always larger than "target" in alsa-pcm.c, that reading next period data is not scheduled on time. With SNDRV_PCM_INFO_BATCH flag in driver, the pipewire will select a smaller period size for device, then the task of reading next period data will be scheduled on time. Signed-off-by: Shengjiu Wang <shengjiu.wang@....com> --- sound/soc/sof/imx/imx8.c | 1 + sound/soc/sof/imx/imx8m.c | 1 + sound/soc/sof/imx/imx8ulp.c | 1 + 3 files changed, 3 insertions(+) diff --git a/sound/soc/sof/imx/imx8.c b/sound/soc/sof/imx/imx8.c index 170740bce839..d777e70250ef 100644 --- a/sound/soc/sof/imx/imx8.c +++ b/sound/soc/sof/imx/imx8.c @@ -603,6 +603,7 @@ static struct snd_sof_dsp_ops sof_imx8x_ops = { SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_BATCH | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP }; diff --git a/sound/soc/sof/imx/imx8m.c b/sound/soc/sof/imx/imx8m.c index f088fd1a672b..1b976fa500aa 100644 --- a/sound/soc/sof/imx/imx8m.c +++ b/sound/soc/sof/imx/imx8m.c @@ -472,6 +472,7 @@ static struct snd_sof_dsp_ops sof_imx8m_ops = { SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_BATCH | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, }; diff --git a/sound/soc/sof/imx/imx8ulp.c b/sound/soc/sof/imx/imx8ulp.c index ca6edb85ff71..2badca75782b 100644 --- a/sound/soc/sof/imx/imx8ulp.c +++ b/sound/soc/sof/imx/imx8ulp.c @@ -463,6 +463,7 @@ static struct snd_sof_dsp_ops sof_imx8ulp_ops = { SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_BATCH | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, /* PM */ -- 2.34.1
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