linux-kernel - [PATCH v3 4/4] ASoC: fsl_sai: Add AUDMIX mode support on i.MX952

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20260123082501.4050296-5-shengjiu.wang@nxp.com>
Date: Fri, 23 Jan 2026 16:25:01 +0800
From: Shengjiu Wang <shengjiu.wang@....com>
To: shengjiu.wang@...il.com,
	Xiubo.Lee@...il.com,
	festevam@...il.com,
	nicoleotsuka@...il.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	linux-sound@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 4/4] ASoC: fsl_sai: Add AUDMIX mode support on i.MX952

One of SAI interfaces is connected to AUDMIX in the i.MX952 chip, but
AUDMIX can be bypassed or not bypassed on the i.MX952 platform.

There are three use cases:
1) SAI -> Codec (No AUDMIX between SAI and Codec)
2) SAI -> Codec (Has AUDMIX, but AUDMIX is bypassed)
3) SAI -> AUDMIX -> Codec (Has AUDMIX and used)

So add 'fsl,sai-amix-mode' property for this feature

fsl,sai-amix-mode = "none": is for case 1)
fsl,sai-amix-mode = "bypass": is for case 2)
fsl,sai-amix-mode = "audmix": is for case 3)

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 include/linux/firmware/imx/sm.h |  2 ++
 sound/soc/fsl/fsl_sai.c         | 21 +++++++++++++++++++++
 sound/soc/fsl/fsl_sai.h         |  4 ++++
 3 files changed, 27 insertions(+)

diff --git a/include/linux/firmware/imx/sm.h b/include/linux/firmware/imx/sm.h
index a33b45027356..ba5d93bd6158 100644
--- a/include/linux/firmware/imx/sm.h
+++ b/include/linux/firmware/imx/sm.h
@@ -26,6 +26,8 @@
 #define SCMI_IMX94_CTRL_SAI3_MCLK	5U	/*!< WAKE SAI3 MCLK */
 #define SCMI_IMX94_CTRL_SAI4_MCLK	6U	/*!< WAKE SAI4 MCLK */
 
+#define SCMI_IMX952_CTRL_BYPASS_AUDMIX	8U      /* WAKE AUDMIX */
+
 #if IS_ENABLED(CONFIG_IMX_SCMI_MISC_DRV)
 int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val);
 int scmi_imx_misc_ctrl_set(u32 id, u32 val);
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 2fa14fbdfe1a..148e09e58dfa 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -7,6 +7,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
+#include <linux/firmware/imx/sm.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/pinctrl/consumer.h>
@@ -1425,10 +1426,12 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	struct fsl_sai *sai;
 	struct regmap *gpr;
 	void __iomem *base;
+	const char *str = NULL;
 	char tmp[8];
 	int irq, ret, i;
 	int index;
 	u32 dmas[4];
+	u32 val;
 
 	sai = devm_kzalloc(dev, sizeof(*sai), GFP_KERNEL);
 	if (!sai)
@@ -1598,6 +1601,24 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	if (ret < 0 && ret != -ENOSYS)
 		goto err_pm_get_sync;
 
+	if (of_device_is_compatible(np, "fsl,imx952-sai") &&
+	    !of_property_read_string(np, "fsl,sai-amix-mode", &str)) {
+		if (!strcmp(str, "bypass"))
+			val = FSL_SAI_AMIX_BYPASS;
+		else if (!strcmp(str, "audmix"))
+			val = FSL_SAI_AMIX_AUDMIX;
+		else
+			val = FSL_SAI_AMIX_NONE;
+
+		if (val < FSL_SAI_AMIX_NONE) {
+			ret = scmi_imx_misc_ctrl_set(SCMI_IMX952_CTRL_BYPASS_AUDMIX, val);
+			if (ret) {
+				dev_err_probe(dev, ret, "Error setting audmix mode\n");
+				goto err_pm_get_sync;
+			}
+		}
+	}
+
 	/*
 	 * Register platform component before registering cpu dai for there
 	 * is not defer probe for platform component in snd_soc_add_pcm_runtime().
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 6c917f79c6b0..7605cbaca3d8 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -230,6 +230,10 @@
 #define FSL_SAI_DL_I2S		BIT(0)
 #define FSL_SAI_DL_PDM		BIT(1)
 
+#define FSL_SAI_AMIX_BYPASS	0
+#define FSL_SAI_AMIX_AUDMIX	1
+#define FSL_SAI_AMIX_NONE	2
+
 struct fsl_sai_soc_data {
 	bool use_imx_pcm;
 	bool use_edma;
-- 
2.34.1