Re: [PATCH 3/3] ASoC: fsl_sai: Specify the maxburst to 8 on i.MX93 platform
From: Shengjiu Wang <shengjiu.wang@gmail.com>
Date: 2022-10-29 22:58:10
Also in:
alsa-devel
On Thu, Oct 27, 2022 at 2:04 PM Chancel Liu [off-list ref] wrote:
There is a limit to eDMA AXI on i.MX93. Only TCD that has NBYTES in a multiple of 8bytes can enable scatter-gather. NBYTES is calculated by bus width times maxburst. On i.MX93 platform the value of maxburst is specified to 8. It makes sure that NBYTES is a multiple of 8bytes. Signed-off-by: Chancel Liu <redacted>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com> best regards wang shengjiu
quoted hunk ↗ jump to hunk
--- sound/soc/fsl/fsl_sai.c | 11 +++++++---- sound/soc/fsl/fsl_sai.h | 1 + 2 files changed, 8 insertions(+), 4 deletions(-)diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index 68e1cc4c369a..a0ea27f06997 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c@@ -872,10 +872,10 @@ static int fsl_sai_dai_probe(struct snd_soc_dai*cpu_dai) regmap_update_bits(sai->regmap, FSL_SAI_TCR1(ofs), FSL_SAI_CR1_RFW_MASK(sai->soc_data->fifo_depth), - sai->soc_data->fifo_depth - FSL_SAI_MAXBURST_TX); + sai->soc_data->fifo_depth - sai->dma_params_tx.maxburst); regmap_update_bits(sai->regmap, FSL_SAI_RCR1(ofs), FSL_SAI_CR1_RFW_MASK(sai->soc_data->fifo_depth), - FSL_SAI_MAXBURST_RX - 1); + sai->dma_params_rx.maxburst - 1); snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx, &sai->dma_params_rx);@@ -1416,8 +1416,10 @@ static int fsl_sai_probe(struct platform_device*pdev) sai->dma_params_rx.addr = sai->res->start + FSL_SAI_RDR0; sai->dma_params_tx.addr = sai->res->start + FSL_SAI_TDR0; - sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX; - sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX; + sai->dma_params_rx.maxburst = + sai->soc_data->max_burst[RX] ? sai->soc_data->max_burst[RX] : FSL_SAI_MAXBURST_RX; + sai->dma_params_tx.maxburst = + sai->soc_data->max_burst[TX] ? sai->soc_data->max_burst[TX] : FSL_SAI_MAXBURST_TX; sai->pinctrl = devm_pinctrl_get(&pdev->dev);@@ -1588,6 +1590,7 @@ static const struct fsl_sai_soc_datafsl_sai_imx93_data = { .pins = 4, .flags = 0, .max_register = FSL_SAI_MCTL, + .max_burst = {8, 8}, }; 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 697f6690068c..197748a888d5 100644 --- a/sound/soc/fsl/fsl_sai.h +++ b/sound/soc/fsl/fsl_sai.h@@ -235,6 +235,7 @@ struct fsl_sai_soc_data { unsigned int reg_offset; unsigned int flags; unsigned int max_register; + unsigned int max_burst[2]; }; /** --2.25.1