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Tue, 11 Jun 2024 07:36:34 -0500 From: Jai Luthra Date: Tue, 11 Jun 2024 18:02:55 +0530 Subject: [PATCH v3 1/2] ALSA: dmaengine: Synchronize dma channel after drop() Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240611-asoc_next-v3-1-fcfd84b12164@ti.com> References: <20240611-asoc_next-v3-0-fcfd84b12164@ti.com> In-Reply-To: <20240611-asoc_next-v3-0-fcfd84b12164@ti.com> To: Lars-Peter Clausen , Jaroslav Kysela , Takashi Iwai , Liam Girdwood , Mark Brown , Peter Ujfalusi CC: , , , Devarsh Thakkar , Vignesh Raghavendra , Jayesh Choudhary , Jai Luthra X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=3460; i=j-luthra@ti.com; h=from:subject:message-id; bh=fvFhI53dTK9iqQDVo32UnwFWX6dUsSzcHoVloVVQ3U0=; b=owEBbQKS/ZANAwAIAUPekfkkmnFFAcsmYgBmaETNG9S7+0ODFUMsfnXellmz1gcZX3Q6zKftx Ut3QmLKhh2JAjMEAAEIAB0WIQRN4NgY5dV16NRar8VD3pH5JJpxRQUCZmhEzQAKCRBD3pH5JJpx Rcl5EACdUKrqsvcM7ouIqAzpy2KzQcHFoK7Fu8GPaD4waODCc+r2jFi3yC/Cq9L2AKV74Hy6JHt thw1+UEtO+HtoYNHHzdq0JOxiUkLpsdgABAhj2WLw8cFXGoUTosj4kE6ntM1TGViymXdd4P6I1m CAOzIPy3hSe8TV4tdZ6qtaSp/8S+NaFia7jyExaZ82seYAqvTZa63Ze89f9xUI256CyVpIuAYmu OPr5OjI/axJJQ8DFCzm6i/Tn5JzKaQIDpdn0wCAj5zUTOYY1CYDDIianHWotDpcgoGuovaOq97y gYgu/XOMT/0dzYTQWEL4ybuQXphanjjV5CEOOCwZWbPkpHFQIEvU3uuVjokudHidLNNr1nuNRR8 BEd4TC5zOfuFPFKhrKKGmJfUiExoR+xEQ37KdXwSS+OzVXpi+/HrVftB8ZqR2eQdKYcVZ9hWsR/ kodMUcQbtGmmzev8YHPDij9OYpnyzTKev1jGeyhLnQ0YOr7mQwmWhRAEnz18v0gMwEgBXwfUS7V HpmI13yKK/+8QLBIsrzbPn3tSVZFet4CkUQ/PpSqaiIrTNAuXkkjh3YzXSuHbzkMhVTixAwGOYr 6zUidr9wFpTPS0lVkEgtVMbQgEFIBvC+BMgp+ea9l6JkQXMW1u6ytcLIgPAtLihNgfGxusa2I6r t/sYjwBsz9YBoIw== X-Developer-Key: i=j-luthra@ti.com; a=openpgp; fpr=4DE0D818E5D575E8D45AAFC543DE91F9249A7145 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sometimes the stream may be stopped due to XRUN events, in which case the userspace can call snd_pcm_drop() and snd_pcm_prepare() to stop and start the stream again. In these cases, we must wait for the DMA channel to synchronize before marking the stream as prepared for playback, as the DMA channel gets stopped by drop() without any synchronization. Make sure the ALSA core synchronizes the DMA channel by adding a sync_stop() hook. Reviewed-by: Peter Ujfalusi Signed-off-by: Jai Luthra --- include/sound/dmaengine_pcm.h | 1 + sound/core/pcm_dmaengine.c | 10 ++++++++++ sound/soc/soc-generic-dmaengine-pcm.c | 8 ++++++++ 3 files changed, 19 insertions(+) diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h index c11aaf8079fb..f6baa9a01868 100644 --- a/include/sound/dmaengine_pcm.h +++ b/include/sound/dmaengine_pcm.h @@ -36,6 +36,7 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, struct dma_chan *chan); int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); +int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream); int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, dma_filter_fn filter_fn, void *filter_data); diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 12aa1cef11a1..ed07fa5693d2 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -349,6 +349,16 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); +int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream) +{ + struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + + dmaengine_synchronize(prtd->dma_chan); + + return 0; +} +EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_sync_stop); + /** * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream * @substream: PCM substream diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index ea3bc9318412..a63e942fdc0b 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -318,6 +318,12 @@ static int dmaengine_copy(struct snd_soc_component *component, return 0; } +static int dmaengine_pcm_sync_stop(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_sync_stop(substream); +} + static const struct snd_soc_component_driver dmaengine_pcm_component = { .name = SND_DMAENGINE_PCM_DRV_NAME, .probe_order = SND_SOC_COMP_ORDER_LATE, @@ -327,6 +333,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component = { .trigger = dmaengine_pcm_trigger, .pointer = dmaengine_pcm_pointer, .pcm_construct = dmaengine_pcm_new, + .sync_stop = dmaengine_pcm_sync_stop, }; static const struct snd_soc_component_driver dmaengine_pcm_component_process = { @@ -339,6 +346,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component_process = { .pointer = dmaengine_pcm_pointer, .copy = dmaengine_copy, .pcm_construct = dmaengine_pcm_new, + .sync_stop = dmaengine_pcm_sync_stop, }; static const char * const dmaengine_pcm_dma_channel_names[] = {