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charset="utf-8" Add new compatible string 'fsl,imx952-asrc' for i.MX952 platform, below are the differences that make this ASRC not fallback compatible with other platforms. 1) There is a power domain on i.MX952 for the wakeupmix system where ASRC is in. But it is enabled by default, ASRC device don't need to enable it, so it is optional for i.MX952. 2) The clock sources of ASRC are different on i.MX952. 3) There is a limitation on i.MX952 that DMA request is not cleared at the end of conversion with dma slave mode. Which causes sample is dropped from the input fifo on the second time if DMA is triggered before the client device and DMA may copy wrong data from output fifo as the output fifo is not ready in the beginning. So there is specially handling in the driver. Signed-off-by: Shengjiu Wang Reviewed-by: Daniel Baluta --- Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml b/Do= cumentation/devicetree/bindings/sound/fsl,imx-asrc.yaml index c9152bac7421..608defc93c1e 100644 --- a/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml +++ b/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml @@ -25,6 +25,7 @@ properties: - fsl,imx53-asrc - fsl,imx8qm-asrc - fsl,imx8qxp-asrc + - fsl,imx952-asrc - items: - enum: - fsl,imx6sx-asrc --=20 2.34.1 From nobody Sun Feb 8 16:53:14 2026 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11010056.outbound.protection.outlook.com [52.101.84.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7ADEA247291; Fri, 6 Feb 2026 01:47:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" There is a limitation on i.MX952 that dma request is not cleared at the end of conversion with dma slave mode. Which causes sample is dropped from the input fifo on the second time if dma is triggered before the client device and EDMA may copy wrong data from output fifo as the output fifo is not ready in the beginning. The solution is to trigger asrc before dma on i.MX952, and add delay to wait output data is generated then start the EDMA for output, otherwise the m2m function has noise issues. So add an option to start ASRC first for M2M before ASRC is enabled on i.MX952. Signed-off-by: Shengjiu Wang Reviewed-by: Daniel Baluta Reviewed-by: Frank Li --- sound/soc/fsl/fsl_asrc.c | 22 ++++++++++++++++++++++ sound/soc/fsl/fsl_asrc.h | 4 ++++ sound/soc/fsl/fsl_asrc_common.h | 4 ++++ sound/soc/fsl/fsl_asrc_m2m.c | 8 +++++++- 4 files changed, 37 insertions(+), 1 deletion(-) diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c index 92fb16f7be45..2fe25667c888 100644 --- a/sound/soc/fsl/fsl_asrc.c +++ b/sound/soc/fsl/fsl_asrc.c @@ -1078,6 +1078,26 @@ static unsigned int fsl_asrc_get_output_fifo_size(st= ruct fsl_asrc_pair *pair) return val >> ASRFSTi_OUTPUT_FIFO_SHIFT; } =20 +static bool fsl_asrc_m2m_output_ready(struct fsl_asrc_pair *pair) +{ + struct fsl_asrc *asrc =3D pair->asrc; + enum asrc_pair_index index =3D pair->index; + u32 val; + int ret; + + /* Check output fifo status if it exceeds the watermark. */ + ret =3D regmap_read_poll_timeout(asrc->regmap, REG_ASRFST(index), val, + (ASRFSTi_OUTPUT_FIFO_FILL(val) >=3D ASRC_M2M_OUTPUTFIFO_WML), + 1, 1000); + + if (ret) { + pair_warn("output is not ready\n"); + return false; + } + + return true; +} + static int fsl_asrc_m2m_prepare(struct fsl_asrc_pair *pair) { struct fsl_asrc_pair_priv *pair_priv =3D pair->private; @@ -1275,6 +1295,7 @@ static int fsl_asrc_probe(struct platform_device *pde= v) =20 asrc_priv->soc =3D of_device_get_match_data(&pdev->dev); asrc->use_edma =3D asrc_priv->soc->use_edma; + asrc->start_before_dma =3D asrc_priv->soc->start_before_dma; asrc->get_dma_channel =3D fsl_asrc_get_dma_channel; asrc->request_pair =3D fsl_asrc_request_pair; asrc->release_pair =3D fsl_asrc_release_pair; @@ -1289,6 +1310,7 @@ static int fsl_asrc_probe(struct platform_device *pde= v) asrc->m2m_get_maxburst =3D fsl_asrc_m2m_get_maxburst; asrc->m2m_pair_resume =3D fsl_asrc_m2m_pair_resume; asrc->m2m_get_cap =3D fsl_asrc_m2m_get_cap; + asrc->m2m_output_ready =3D fsl_asrc_m2m_output_ready; =20 if (of_device_is_compatible(np, "fsl,imx35-asrc")) { asrc_priv->clk_map[IN] =3D input_clk_map_imx35; diff --git a/sound/soc/fsl/fsl_asrc.h b/sound/soc/fsl/fsl_asrc.h index 1c492eb237f5..60b6865ca952 100644 --- a/sound/soc/fsl/fsl_asrc.h +++ b/sound/soc/fsl/fsl_asrc.h @@ -257,6 +257,8 @@ #define ASRFSTi_OUTPUT_FIFO_WIDTH 7 #define ASRFSTi_OUTPUT_FIFO_SHIFT 12 #define ASRFSTi_OUTPUT_FIFO_MASK (((1 << ASRFSTi_OUTPUT_FIFO_WIDTH) - 1) <= < ASRFSTi_OUTPUT_FIFO_SHIFT) +#define ASRFSTi_OUTPUT_FIFO_FILL(v) \ + (((v) & ASRFSTi_OUTPUT_FIFO_MASK) >> ASRFSTi_OUTPUT_FIFO_SHIFT) #define ASRFSTi_IAEi_SHIFT 11 #define ASRFSTi_IAEi_MASK (1 << ASRFSTi_IAEi_SHIFT) #define ASRFSTi_IAEi (1 << ASRFSTi_IAEi_SHIFT) @@ -432,10 +434,12 @@ struct dma_block { * * @use_edma: using edma as dma device or not * @channel_bits: width of ASRCNCR register for each pair + * @start_before_dma: start asrc before dma */ struct fsl_asrc_soc_data { bool use_edma; unsigned int channel_bits; + bool start_before_dma; }; =20 /** diff --git a/sound/soc/fsl/fsl_asrc_common.h b/sound/soc/fsl/fsl_asrc_commo= n.h index 0cd595b0f629..c8a1a2b5915d 100644 --- a/sound/soc/fsl/fsl_asrc_common.h +++ b/sound/soc/fsl/fsl_asrc_common.h @@ -107,6 +107,7 @@ struct fsl_asrc_pair { * @asrc_rate: default sample rate for ASoC Back-Ends * @asrc_format: default sample format for ASoC Back-Ends * @use_edma: edma is used + * @start_before_dma: start asrc before dma * @get_dma_channel: function pointer * @request_pair: function pointer * @release_pair: function pointer @@ -116,6 +117,7 @@ struct fsl_asrc_pair { * @m2m_start: function pointer * @m2m_unprepare: function pointer * @m2m_stop: function pointer + * @m2m_output_ready: function pointer, check output fifo ready or not * @m2m_calc_out_len: function pointer * @m2m_get_maxburst: function pointer * @m2m_pair_suspend: function pointer @@ -143,6 +145,7 @@ struct fsl_asrc { int asrc_rate; snd_pcm_format_t asrc_format; bool use_edma; + bool start_before_dma; =20 struct dma_chan *(*get_dma_channel)(struct fsl_asrc_pair *pair, bool dir); int (*request_pair)(int channels, struct fsl_asrc_pair *pair); @@ -154,6 +157,7 @@ struct fsl_asrc { int (*m2m_start)(struct fsl_asrc_pair *pair); int (*m2m_unprepare)(struct fsl_asrc_pair *pair); int (*m2m_stop)(struct fsl_asrc_pair *pair); + bool (*m2m_output_ready)(struct fsl_asrc_pair *pair); =20 int (*m2m_calc_out_len)(struct fsl_asrc_pair *pair, int input_buffer_leng= th); int (*m2m_get_maxburst)(u8 dir, struct fsl_asrc_pair *pair); diff --git a/sound/soc/fsl/fsl_asrc_m2m.c b/sound/soc/fsl/fsl_asrc_m2m.c index f46881f71e43..77999526dd9e 100644 --- a/sound/soc/fsl/fsl_asrc_m2m.c +++ b/sound/soc/fsl/fsl_asrc_m2m.c @@ -253,15 +253,21 @@ static int asrc_m2m_device_run(struct fsl_asrc_pair *= pair, struct snd_compr_task reinit_completion(&pair->complete[IN]); reinit_completion(&pair->complete[OUT]); =20 + if (asrc->start_before_dma) + asrc->m2m_start(pair); + /* Submit DMA request */ dmaengine_submit(pair->desc[IN]); 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charset="utf-8" Add a compatible string, clock mapping table and enable the option 'start_before_dma' to support ASRC on the i.MX952 platform. The clock mapping table is to map the clock sources on i.MX952 to the clock ids in the driver, the clock ids are for all the clock sources on all supported platforms. Signed-off-by: Shengjiu Wang Reviewed-by: Daniel Baluta Reviewed-by: Frank Li --- sound/soc/fsl/fsl_asrc.c | 16 ++++++++++++++++ sound/soc/fsl/fsl_asrc.h | 14 ++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c index 2fe25667c888..5fda9b647c70 100644 --- a/sound/soc/fsl/fsl_asrc.c +++ b/sound/soc/fsl/fsl_asrc.c @@ -106,6 +106,12 @@ static unsigned char clk_map_imx8qxp[2][ASRC_CLK_MAP_L= EN] =3D { }, }; =20 +static unsigned char clk_map_imx952[ASRC_CLK_MAP_LEN] =3D { + 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf= , 0x0, + 0x0, 0x1, 0x2, 0x3, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0x4, 0x5, 0x6, 0x8, 0xf= , 0xf, + 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0x7, 0x9, 0xa, 0xb, 0xc, 0xd, 0xf, 0xf, 0xf= , 0xf, +}; + /* * According to RM, the divider range is 1 ~ 8, * prescaler is power of 2 from 1 ~ 128. @@ -1337,6 +1343,9 @@ static int fsl_asrc_probe(struct platform_device *pde= v) asrc_priv->clk_map[IN] =3D clk_map_imx8qxp[map_idx]; asrc_priv->clk_map[OUT] =3D clk_map_imx8qxp[map_idx]; } + } else if (of_device_is_compatible(np, "fsl,imx952-asrc")) { + asrc_priv->clk_map[IN] =3D clk_map_imx952; + asrc_priv->clk_map[OUT] =3D clk_map_imx952; } =20 asrc->channel_avail =3D 10; @@ -1575,11 +1584,18 @@ static const struct fsl_asrc_soc_data fsl_asrc_imx8= qxp_data =3D { .channel_bits =3D 4, }; =20 +static const struct fsl_asrc_soc_data fsl_asrc_imx952_data =3D { + .use_edma =3D true, + .channel_bits =3D 4, + .start_before_dma =3D true, +}; + static const struct of_device_id fsl_asrc_ids[] =3D { { .compatible =3D "fsl,imx35-asrc", .data =3D &fsl_asrc_imx35_data }, { .compatible =3D "fsl,imx53-asrc", .data =3D &fsl_asrc_imx53_data }, { .compatible =3D "fsl,imx8qm-asrc", .data =3D &fsl_asrc_imx8qm_data }, { .compatible =3D "fsl,imx8qxp-asrc", .data =3D &fsl_asrc_imx8qxp_data }, + { .compatible =3D "fsl,imx952-asrc", .data =3D &fsl_asrc_imx952_data }, {} }; MODULE_DEVICE_TABLE(of, fsl_asrc_ids); diff --git a/sound/soc/fsl/fsl_asrc.h b/sound/soc/fsl/fsl_asrc.h index 60b6865ca952..7a81366a0ee4 100644 --- a/sound/soc/fsl/fsl_asrc.h +++ b/sound/soc/fsl/fsl_asrc.h @@ -326,6 +326,13 @@ enum asrc_inclk { INCLK_SAI6_TX_BCLK =3D 0x22, INCLK_HDMI_RX_SAI0_RX_BCLK =3D 0x24, INCLK_HDMI_TX_SAI0_TX_BCLK =3D 0x25, + + INCLK_SAI2_TX_BCLK =3D 0x26, + INCLK_SAI3_TX_BCLK =3D 0x27, + INCLK_SAI4_RX_BCLK =3D 0x28, + INCLK_SAI4_TX_BCLK =3D 0x29, + INCLK_SAI5_RX_BCLK =3D 0x2a, + INCLK_SAI5_TX_BCLK =3D 0x2b, }; 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Fri, 6 Feb 2026 01:47:31 +0000 Received: from VI1PR04MB7055.eurprd04.prod.outlook.com ([fe80::d6ab:1538:d868:bf8]) by VI1PR04MB7055.eurprd04.prod.outlook.com ([fe80::d6ab:1538:d868:bf8%7]) with mapi id 15.20.9564.014; Fri, 6 Feb 2026 01:47:31 +0000 From: Shengjiu Wang To: lgirdwood@gmail.com, broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, nicoleotsuka@gmail.com, perex@perex.cz, tiwai@suse.com, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 4/4] ASoC: fsl_asrc_dma: allocate memory from dma device Date: Fri, 6 Feb 2026 09:48:05 +0800 Message-Id: <20260206014805.3897764-5-shengjiu.wang@nxp.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20260206014805.3897764-1-shengjiu.wang@nxp.com> References: <20260206014805.3897764-1-shengjiu.wang@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI2PR04CA0004.apcprd04.prod.outlook.com (2603:1096:4:197::22) To VI1PR04MB7055.eurprd04.prod.outlook.com (2603:10a6:800:123::21) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VI1PR04MB7055:EE_|VI0PR04MB12210:EE_ X-MS-Office365-Filtering-Correlation-Id: 0f4d78ed-a2a1-457f-2d76-08de6521b138 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|52116014|1800799024|19092799006|921020|38350700014; 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charset="utf-8" The dma-coherent property is used to indicate a device is capable of coherent DMA operations. On i.MX952, one of EDMA devices support such feature, in order to support the EDMA device, the memory needs to be allocated from the DMA device. Make this driver to support both non dma-coherent and dma-coherent dma engine. Remove dma coerce_mask_and coherent() because DMA provider already set it according to its capability. Signed-off-by: Shengjiu Wang Reviewed-by: Frank Li --- sound/soc/fsl/fsl_asrc_dma.c | 48 ++++++++++++++++++++++++++++++------ 1 file changed, 41 insertions(+), 7 deletions(-) diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c index 7dacc06b2f02..348b0aabfa68 100644 --- a/sound/soc/fsl/fsl_asrc_dma.c +++ b/sound/soc/fsl/fsl_asrc_dma.c @@ -449,18 +449,52 @@ fsl_asrc_dma_pcm_pointer(struct snd_soc_component *co= mponent, static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component, struct snd_soc_pcm_runtime *rtd) { - struct snd_card *card =3D rtd->card->snd_card; + struct device *dev =3D component->dev; + struct fsl_asrc *asrc =3D dev_get_drvdata(dev); + struct fsl_asrc_pair *pair; struct snd_pcm *pcm =3D rtd->pcm; + struct dma_chan *chan; int ret; =20 - ret =3D dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); - if (ret) { - dev_err(card->dev, "failed to set DMA mask\n"); - return ret; + pair =3D kzalloc(size_add(sizeof(*pair), asrc->pair_priv_size), GFP_KERNE= L); + if (!pair) + return -ENOMEM; + + pair->asrc =3D asrc; + pair->private =3D (void *)pair + sizeof(struct fsl_asrc_pair); + + /* Request a pair, which will be released later. + * Request pair function needs channel num as input, for this + * pair, we just request "1" channel temporarily. + */ + ret =3D asrc->request_pair(1, pair); + if (ret < 0) { + dev_err(dev, "failed to request asrc pair\n"); + goto req_pair_err; + } + + /* Request a dma channel, which will be released later. */ + chan =3D asrc->get_dma_channel(pair, IN); + if (!chan) { + dev_err(dev, "failed to get dma channel\n"); + ret =3D -EINVAL; + goto dma_chan_err; } =20 - return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, - card->dev, FSL_ASRC_DMABUF_SIZE); + ret =3D snd_pcm_set_fixed_buffer_all(pcm, + SNDRV_DMA_TYPE_DEV, + chan->device->dev, + FSL_ASRC_DMABUF_SIZE); + + dma_release_channel(chan); + +dma_chan_err: + asrc->release_pair(pair); + +req_pair_err: + kfree(pair); + + return ret; } =20 struct snd_soc_component_driver fsl_asrc_component =3D { --=20 2.34.1