From fa1f875c120fa44572c561d86022af2f6b0774c7 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Mon, 10 Feb 2020 17:14:02 +0200 Subject: ALSA: dmaengine_pcm: Consider DMA cache caused delay in pointer callback Some DMA engines can have big FIFOs which adds to the latency. The DMAengine framework can report the FIFO utilization in bytes. Use this information for the delay reporting. Signed-off-by: Peter Ujfalusi Reviewed-by: Takashi Iwai Link: https://lore.kernel.org/r/20200210151402.29634-1-peter.ujfalusi@ti.com Signed-off-by: Mark Brown --- sound/core/pcm_dmaengine.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'sound/core/pcm_dmaengine.c') diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 5749a8a49784..d8be7b488162 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -247,9 +247,14 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) { + struct snd_pcm_runtime *runtime = substream->runtime; + buf_size = snd_pcm_lib_buffer_bytes(substream); if (state.residue > 0 && state.residue <= buf_size) pos = buf_size - state.residue; + + runtime->delay = bytes_to_frames(runtime, + state.in_flight_bytes); } return bytes_to_frames(substream->runtime, pos); -- cgit From 9d789dc047e32fb0f85ff192f883a534017512a2 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Mon, 10 Feb 2020 17:33:36 +0200 Subject: ALSA: dmaengine_pcm: Consider DMA cache caused delay in pointer callback Some DMA engines can have big FIFOs which adds to the latency. The DMAengine framework can report the FIFO utilization in bytes. Use this information for the delay reporting. Signed-off-by: Peter Ujfalusi Reviewed-by: Takashi Iwai Link: https://lore.kernel.org/r/20200210153336.10218-1-peter.ujfalusi@ti.com Signed-off-by: Mark Brown --- sound/core/pcm_dmaengine.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'sound/core/pcm_dmaengine.c') diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index d8be7b488162..6852bb670b4e 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -240,6 +240,7 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue); snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) { struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + struct snd_pcm_runtime *runtime = substream->runtime; struct dma_tx_state state; enum dma_status status; unsigned int buf_size; @@ -257,7 +258,7 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) state.in_flight_bytes); } - return bytes_to_frames(substream->runtime, pos); + return bytes_to_frames(runtime, pos); } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer); -- cgit From f9c23615c688270d2a383bd752f7a54a7137d596 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Thu, 27 Feb 2020 11:35:44 +0200 Subject: ALSA: dmaengine_pcm: No need to take runtime reference twice in pcm_pointer The runtime pointer has been taken in functional level so there is no need to take it again under the if () case. Fixes: 9d789dc047e3 ("ALSA: dmaengine_pcm: Consider DMA cache caused delay in pointer callback") Signed-off-by: Peter Ujfalusi Link: https://lore.kernel.org/r/20200227093544.27723-1-peter.ujfalusi@ti.com Signed-off-by: Mark Brown --- sound/core/pcm_dmaengine.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'sound/core/pcm_dmaengine.c') diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 6852bb670b4e..9d4f48cfe47f 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -248,8 +248,6 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) { - struct snd_pcm_runtime *runtime = substream->runtime; - buf_size = snd_pcm_lib_buffer_bytes(substream); if (state.residue > 0 && state.residue <= buf_size) pos = buf_size - state.residue; -- cgit