linux-kernel - [PATCH v2 3/3] ASoC: fsl_xcvr: Add constraints of period size while using eDMA

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Message-Id: <20221229063009.2396716-4-chancel.liu@nxp.com>
Date:   Thu, 29 Dec 2022 14:30:09 +0800
From:   Chancel Liu <chancel.liu@....com>
To:     lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shengjiu.wang@...il.com,
        Xiubo.Lee@...il.com, festevam@...il.com, nicoleotsuka@...il.com,
        perex@...ex.cz, tiwai@...e.com, devicetree@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Chancel Liu <chancel.liu@....com>
Subject: [PATCH v2 3/3] ASoC: fsl_xcvr: Add constraints of period size while using eDMA

eDMA on i.MX93 platform requires the period size to be multiple of
maxburst.

Signed-off-by: Chancel Liu <chancel.liu@....com>
---
 sound/soc/fsl/fsl_xcvr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c
index b794158a7876..2a78243df752 100644
--- a/sound/soc/fsl/fsl_xcvr.c
+++ b/sound/soc/fsl/fsl_xcvr.c
@@ -22,6 +22,7 @@
 struct fsl_xcvr_soc_data {
 	const char *fw_name;
 	bool spdif_only;
+	bool use_edma;
 };
 
 struct fsl_xcvr {
@@ -538,6 +539,16 @@ static int fsl_xcvr_startup(struct snd_pcm_substream *substream,
 		return -EBUSY;
 	}
 
+	/*
+	 * EDMA controller needs period size to be a multiple of
+	 * tx/rx maxburst
+	 */
+	if (xcvr->soc_data->use_edma)
+		snd_pcm_hw_constraint_step(substream->runtime, 0,
+					   SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+					   tx ? xcvr->dma_prms_tx.maxburst :
+					   xcvr->dma_prms_rx.maxburst);
+
 	switch (xcvr->mode) {
 	case FSL_XCVR_MODE_SPDIF:
 	case FSL_XCVR_MODE_ARC:
@@ -1207,6 +1218,7 @@ static const struct fsl_xcvr_soc_data fsl_xcvr_imx8mp_data = {
 
 static const struct fsl_xcvr_soc_data fsl_xcvr_imx93_data = {
 	.spdif_only = true,
+	.use_edma = true,
 };
 
 static const struct of_device_id fsl_xcvr_dt_ids[] = {
-- 
2.25.1