linux-kernel - [PATCH 3/3] ASoC: fsl_sai: Specify the maxburst to 8 on i.MX93 platform

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Date:   Thu, 27 Oct 2022 14:03:11 +0800
From:   Chancel Liu <chancel.liu@....com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, linuxppc-dev@...ts.ozlabs.org
Cc:     Chancel Liu <chancel.liu@....com>
Subject: [PATCH 3/3] ASoC: fsl_sai: Specify the maxburst to 8 on i.MX93 platform

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 <chancel.liu@....com>
---
 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_data fsl_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