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Mon, 10 Jun 2024 05:56:27 -0500 From: Jai Luthra Date: Mon, 10 Jun 2024 16:26:00 +0530 Subject: [PATCH v2 1/2] ALSA: dmaengine: Synchronize dma channel in prepare() Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240610-asoc_next-v2-1-b52aaf5d67c4@ti.com> References: <20240610-asoc_next-v2-0-b52aaf5d67c4@ti.com> In-Reply-To: <20240610-asoc_next-v2-0-b52aaf5d67c4@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=3364; i=j-luthra@ti.com; h=from:subject:message-id; bh=O+lWqMRXwSy8zBJ1mc67aSXihmGU78/BDKwHYJeNvQw=; b=owEBbQKS/ZANAwAIAUPekfkkmnFFAcsmYgBmZtvXvyGKfK9Fw7nQW8ivV8GWNEMKrun8JD93m 24/mt6wReOJAjMEAAEIAB0WIQRN4NgY5dV16NRar8VD3pH5JJpxRQUCZmbb1wAKCRBD3pH5JJpx RRZVEACYO/2PEQhnin0tBClnmN5daonwZs/efSNQ0rQ/6aq0El9FRVHGeDUN6vYFdPMloxR5ny0 vpTFccQKV2DQa6uyiw5jIWjiNr1su8HEXlizOINmu/F8bsUaL/A/7hb2182YWKikBNWzbW4XkyF pETB13RztXAD3d15rjIAuPIjxbf2GonuBwuqVM37ypWcrimCxNk11Qugxh3Shuw/HPEhwBdVXkb cvDE2IE2m2J+uwHCiS0YSSQ7Z4hGlPa85ZF4OL47nkt2yW3b4Q8LGcrNEWZ4Vyt2ilURdL9bVS8 v4jakrlH8Ce0xmvvtiL2ytSl9IlRXvUzTMUNU8R+QSoNI8DgiueK4wwVbf93jta4B2WNoQcftm4 FL4qTkjo8l2ip6R2O68DaTTtCoGU6QAY1nEDpTXdZr3MrP3a0cPuTJXGYmwTs3vo3zLgfKum0sP TsLlT3ORUdDnqNDUK8+e+7S1hLiAwGdRkv4aBv47j8bMkZQjT8sboXGnImAq2Wfef18UiyBOaxD vvMHQdU3z34qfM6IvCFnLPgWqYdR+O2HK0ioMptZ4sRGTd57Zhi0ncccO0CtrDi4ZfPDW8cNEk4 yBz83QnS2VZAtJwogbGoO0f6rtpdxZedN0Sok+Kdm+F9IK7pyxkUMIvLxiSrX///Da0wDyv+3kl Z2++lP+bEbDZepQ== 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 snd_pcm_drop() without any synchronization. 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..9c5800e5659f 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_prepare(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..dbf5c6136d68 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_prepare(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_prepare); + /** * 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..078fcb0ba8a2 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_prepare(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_prepare(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, + .prepare = dmaengine_pcm_prepare, }; 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, + .prepare = dmaengine_pcm_prepare, }; static const char * const dmaengine_pcm_dma_channel_names[] = {