From: Daniel Baluta <daniel.baluta@nxp.com> To: broonie@kernel.org Cc: festevam@gmail.com, nicoleotsuka@gmail.com, Xiubo.Lee@gmail.com, shengjiu.wang@nxp.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, timur@kernel.org, mihai.serban@gmail.com, Mihai Serban <mihai.serban@nxp.com>, NXP Linux Team <linux-imx@nxp.com>, Daniel Baluta <daniel.baluta@nxp.com> Subject: [PATCH] ASoC: fsl_sai: Fix noise when using EDMA Date: Fri, 30 Aug 2019 23:09:00 +0300 [thread overview] Message-ID: <20190830200900.19668-1-daniel.baluta@nxp.com> (raw) From: Mihai Serban <mihai.serban@nxp.com> EDMA requires the period size to be multiple of maxburst. Otherwise the remaining bytes are not transferred and thus noise is produced. We can handle this issue by adding a constraint on SNDRV_PCM_HW_PARAM_PERIOD_SIZE to be multiple of tx/rx maxburst value. Cc: NXP Linux Team <linux-imx@nxp.com> Signed-off-by: Mihai Serban <mihai.serban@nxp.com> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> --- sound/soc/fsl/fsl_sai.c | 15 +++++++++++++++ sound/soc/fsl/fsl_sai.h | 1 + 2 files changed, 16 insertions(+) diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index 728307acab90..fe126029f4e3 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -612,6 +612,16 @@ static int fsl_sai_startup(struct snd_pcm_substream *substream, FSL_SAI_CR3_TRCE_MASK, FSL_SAI_CR3_TRCE); + /* + * some DMA controllers need period size to be a multiple of + * tx/rx maxburst + */ + if (sai->soc_data->use_constraint_period_size) + snd_pcm_hw_constraint_step(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + tx ? sai->dma_params_tx.maxburst : + sai->dma_params_rx.maxburst); + ret = snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints); @@ -1011,30 +1021,35 @@ static const struct fsl_sai_soc_data fsl_sai_vf610_data = { .use_imx_pcm = false, .fifo_depth = 32, .reg_offset = 0, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = { .use_imx_pcm = true, .fifo_depth = 32, .reg_offset = 0, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = { .use_imx_pcm = true, .fifo_depth = 16, .reg_offset = 8, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = { .use_imx_pcm = true, .fifo_depth = 128, .reg_offset = 8, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = { .use_imx_pcm = true, .fifo_depth = 64, .reg_offset = 0, + .use_constraint_period_size = true, }; static const struct of_device_id fsl_sai_ids[] = { diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h index b89b0ca26053..3a3f6f8e5595 100644 --- a/sound/soc/fsl/fsl_sai.h +++ b/sound/soc/fsl/fsl_sai.h @@ -157,6 +157,7 @@ struct fsl_sai_soc_data { bool use_imx_pcm; + bool use_constraint_period_size; unsigned int fifo_depth; unsigned int reg_offset; }; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Baluta <daniel.baluta@nxp.com> To: broonie@kernel.org Cc: alsa-devel@alsa-project.org, timur@kernel.org, Xiubo.Lee@gmail.com, Daniel Baluta <daniel.baluta@nxp.com>, shengjiu.wang@nxp.com, linux-kernel@vger.kernel.org, nicoleotsuka@gmail.com, NXP Linux Team <linux-imx@nxp.com>, Mihai Serban <mihai.serban@nxp.com>, festevam@gmail.com, mihai.serban@gmail.com Subject: [alsa-devel] [PATCH] ASoC: fsl_sai: Fix noise when using EDMA Date: Fri, 30 Aug 2019 23:09:00 +0300 [thread overview] Message-ID: <20190830200900.19668-1-daniel.baluta@nxp.com> (raw) Message-ID: <20190830200900.26SDO1VB2cK44vOJw8cgMsfycU5OlGkHqdot5zj3Hso@z> (raw) From: Mihai Serban <mihai.serban@nxp.com> EDMA requires the period size to be multiple of maxburst. Otherwise the remaining bytes are not transferred and thus noise is produced. We can handle this issue by adding a constraint on SNDRV_PCM_HW_PARAM_PERIOD_SIZE to be multiple of tx/rx maxburst value. Cc: NXP Linux Team <linux-imx@nxp.com> Signed-off-by: Mihai Serban <mihai.serban@nxp.com> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> --- sound/soc/fsl/fsl_sai.c | 15 +++++++++++++++ sound/soc/fsl/fsl_sai.h | 1 + 2 files changed, 16 insertions(+) diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index 728307acab90..fe126029f4e3 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -612,6 +612,16 @@ static int fsl_sai_startup(struct snd_pcm_substream *substream, FSL_SAI_CR3_TRCE_MASK, FSL_SAI_CR3_TRCE); + /* + * some DMA controllers need period size to be a multiple of + * tx/rx maxburst + */ + if (sai->soc_data->use_constraint_period_size) + snd_pcm_hw_constraint_step(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + tx ? sai->dma_params_tx.maxburst : + sai->dma_params_rx.maxburst); + ret = snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints); @@ -1011,30 +1021,35 @@ static const struct fsl_sai_soc_data fsl_sai_vf610_data = { .use_imx_pcm = false, .fifo_depth = 32, .reg_offset = 0, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = { .use_imx_pcm = true, .fifo_depth = 32, .reg_offset = 0, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = { .use_imx_pcm = true, .fifo_depth = 16, .reg_offset = 8, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = { .use_imx_pcm = true, .fifo_depth = 128, .reg_offset = 8, + .use_constraint_period_size = false, }; static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = { .use_imx_pcm = true, .fifo_depth = 64, .reg_offset = 0, + .use_constraint_period_size = true, }; static const struct of_device_id fsl_sai_ids[] = { diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h index b89b0ca26053..3a3f6f8e5595 100644 --- a/sound/soc/fsl/fsl_sai.h +++ b/sound/soc/fsl/fsl_sai.h @@ -157,6 +157,7 @@ struct fsl_sai_soc_data { bool use_imx_pcm; + bool use_constraint_period_size; unsigned int fifo_depth; unsigned int reg_offset; }; -- 2.17.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
next reply other threads:[~2019-08-30 20:09 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-30 20:09 Daniel Baluta [this message] 2019-08-30 20:09 ` [alsa-devel] [PATCH] ASoC: fsl_sai: Fix noise when using EDMA Daniel Baluta 2019-09-06 1:24 ` Nicolin Chen 2019-09-06 1:24 ` [alsa-devel] " Nicolin Chen 2019-09-06 6:46 ` Daniel Baluta 2019-09-06 6:46 ` Daniel Baluta 2019-09-09 19:32 ` Nicolin Chen 2019-09-09 19:32 ` Nicolin Chen
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